[PATCH 0/3] drivers/perf: convert sysfs sprintf/snprintf/scnprintf to sysfs_emit
Use the generic sysfs_emit() and sysfs_emit_at() function to take place of sprintf/snprintf/scnprintf, to avoid buffer overrun. Zihao Tang (1) drivers/perf: convert sysfs snprintf family to sysfs_emit Qi Liu (2): drivers/perf: convert sysfs scnprintf family to sysfs_emit_at drivers/perf: convert sysfs sprintf family to sysfs_emit drivers/perf/arm-cci.c | 12 ++++++------ drivers/perf/arm-ccn.c | 28 ++++++++++++---------------- drivers/perf/arm-cmn.c | 22 +++++++++++----------- drivers/perf/arm_dmc620_pmu.c | 2 +- drivers/perf/arm_dsu_pmu.c | 5 ++--- drivers/perf/arm_smmuv3_pmu.c | 4 ++-- drivers/perf/arm_spe_pmu.c | 3 +-- drivers/perf/fsl_imx8_ddr_perf.c | 7 +++---- drivers/perf/hisilicon/hisi_uncore_pmu.c | 8 ++++---- drivers/perf/qcom_l2_pmu.c | 2 +- drivers/perf/qcom_l3_pmu.c | 4 ++-- drivers/perf/thunderx2_pmu.c | 4 ++-- drivers/perf/xgene_pmu.c | 4 ++-- 13 files changed, 49 insertions(+), 56 deletions(-) -- 2.8.1
From: Zihao Tang <tangzihao1@hisilicon.com> Fix the following coccicheck warning: ./drivers/perf/hisilicon/hisi_uncore_pmu.c:128:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/fsl_imx8_ddr_perf.c:173:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm_spe_pmu.c:129:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm_smmu_pmu.c:563:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm_dsu_pmu.c:149:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm_dsu_pmu.c:139:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cmn.c:563:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cmn.c:351:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-ccn.c:224:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cci.c:708:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cci.c:699:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cci.c:528:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cci.c:309:8-16: WARNING: use scnprintf or sprintf. Signed-off-by: Zihao Tang <tangzihao1@hisilicon.com> Signed-off-by: Qi Liu <liuqi115@huawei.com> --- drivers/perf/arm-cci.c | 12 ++++++------ drivers/perf/arm-ccn.c | 4 ++-- drivers/perf/arm-cmn.c | 22 +++++++++++----------- drivers/perf/arm_dsu_pmu.c | 5 ++--- drivers/perf/arm_smmuv3_pmu.c | 2 +- drivers/perf/arm_spe_pmu.c | 3 +-- drivers/perf/fsl_imx8_ddr_perf.c | 3 +-- drivers/perf/hisilicon/hisi_uncore_pmu.c | 2 +- 8 files changed, 25 insertions(+), 28 deletions(-) diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c index f81e2ec..666d8a9 100644 --- a/drivers/perf/arm-cci.c +++ b/drivers/perf/arm-cci.c @@ -306,7 +306,7 @@ static ssize_t cci400_pmu_cycle_event_show(struct device *dev, { struct dev_ext_attribute *eattr = container_of(attr, struct dev_ext_attribute, attr); - return snprintf(buf, PAGE_SIZE, "config=0x%lx\n", (unsigned long)eattr->var); + return sysfs_emit(buf, "config=0x%lx\n", (unsigned long)eattr->var); } static int cci400_get_event_idx(struct cci_pmu *cci_pmu, @@ -525,8 +525,8 @@ static ssize_t cci5xx_pmu_global_event_show(struct device *dev, struct dev_ext_attribute *eattr = container_of(attr, struct dev_ext_attribute, attr); /* Global events have single fixed source code */ - return snprintf(buf, PAGE_SIZE, "event=0x%lx,source=0x%x\n", - (unsigned long)eattr->var, CCI5xx_PORT_GLOBAL); + return sysfs_emit(buf, "event=0x%lx,source=0x%x\n", + (unsigned long)eattr->var, CCI5xx_PORT_GLOBAL); } /* @@ -696,7 +696,7 @@ static ssize_t cci_pmu_format_show(struct device *dev, { struct dev_ext_attribute *eattr = container_of(attr, struct dev_ext_attribute, attr); - return snprintf(buf, PAGE_SIZE, "%s\n", (char *)eattr->var); + return sysfs_emit(buf, "%s\n", (char *)eattr->var); } static ssize_t cci_pmu_event_show(struct device *dev, @@ -705,8 +705,8 @@ static ssize_t cci_pmu_event_show(struct device *dev, struct dev_ext_attribute *eattr = container_of(attr, struct dev_ext_attribute, attr); /* source parameter is mandatory for normal PMU events */ - return snprintf(buf, PAGE_SIZE, "source=?,event=0x%lx\n", - (unsigned long)eattr->var); + return sysfs_emit(buf, "source=?,event=0x%lx\n", + (unsigned long)eattr->var); } static int pmu_is_valid_counter(struct cci_pmu *cci_pmu, int idx) diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c index a0a71c1..3a2ddc0 100644 --- a/drivers/perf/arm-ccn.c +++ b/drivers/perf/arm-ccn.c @@ -221,7 +221,7 @@ static ssize_t arm_ccn_pmu_format_show(struct device *dev, struct dev_ext_attribute *ea = container_of(attr, struct dev_ext_attribute, attr); - return snprintf(buf, PAGE_SIZE, "%s\n", (char *)ea->var); + return sysfs_emit(buf, "%s\n", (char *)ea->var); } #define CCN_FORMAT_ATTR(_name, _config) \ @@ -476,7 +476,7 @@ static ssize_t arm_ccn_pmu_cmp_mask_show(struct device *dev, struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev)); u64 *mask = arm_ccn_pmu_get_cmp_mask(ccn, attr->attr.name); - return mask ? snprintf(buf, PAGE_SIZE, "0x%016llx\n", *mask) : -EINVAL; + return mask ? sysfs_emit(buf, "0x%016llx\n", *mask) : -EINVAL; } static ssize_t arm_ccn_pmu_cmp_mask_store(struct device *dev, diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index 1328159f..56a5c35 100644 --- a/drivers/perf/arm-cmn.c +++ b/drivers/perf/arm-cmn.c @@ -348,19 +348,19 @@ static ssize_t arm_cmn_event_show(struct device *dev, eattr = container_of(attr, typeof(*eattr), attr); if (eattr->type == CMN_TYPE_DTC) - return snprintf(buf, PAGE_SIZE, "type=0x%x\n", eattr->type); + return sysfs_emit(buf, "type=0x%x\n", eattr->type); if (eattr->type == CMN_TYPE_WP) - return snprintf(buf, PAGE_SIZE, - "type=0x%x,eventid=0x%x,wp_dev_sel=?,wp_chn_sel=?,wp_grp=?,wp_val=?,wp_mask=?\n", - eattr->type, eattr->eventid); + return sysfs_emit(buf, + "type=0x%x,eventid=0x%x,wp_dev_sel=?,wp_chn_sel=?,wp_grp=?,wp_val=?,wp_mask=?\n", + eattr->type, eattr->eventid); if (arm_cmn_is_occup_event(eattr->type, eattr->eventid)) - return snprintf(buf, PAGE_SIZE, "type=0x%x,eventid=0x%x,occupid=0x%x\n", - eattr->type, eattr->eventid, eattr->occupid); + return sysfs_emit(buf, "type=0x%x,eventid=0x%x,occupid=0x%x\n", + eattr->type, eattr->eventid, eattr->occupid); - return snprintf(buf, PAGE_SIZE, "type=0x%x,eventid=0x%x\n", - eattr->type, eattr->eventid); + return sysfs_emit(buf, "type=0x%x,eventid=0x%x\n", eattr->type, + eattr->eventid); } static umode_t arm_cmn_event_attr_is_visible(struct kobject *kobj, @@ -560,12 +560,12 @@ static ssize_t arm_cmn_format_show(struct device *dev, int lo = __ffs(fmt->field), hi = __fls(fmt->field); if (lo == hi) - return snprintf(buf, PAGE_SIZE, "config:%d\n", lo); + return sysfs_emit(buf, "config:%d\n", lo); if (!fmt->config) - return snprintf(buf, PAGE_SIZE, "config:%d-%d\n", lo, hi); + return sysfs_emit(buf, "config:%d-%d\n", lo, hi); - return snprintf(buf, PAGE_SIZE, "config%d:%d-%d\n", fmt->config, lo, hi); + return sysfs_emit(buf, "config%d:%d-%d\n", fmt->config, lo, hi); } #define _CMN_FORMAT_ATTR(_name, _cfg, _fld) \ diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c index 0459a34..196faea 100644 --- a/drivers/perf/arm_dsu_pmu.c +++ b/drivers/perf/arm_dsu_pmu.c @@ -136,8 +136,7 @@ static ssize_t dsu_pmu_sysfs_event_show(struct device *dev, { struct dev_ext_attribute *eattr = container_of(attr, struct dev_ext_attribute, attr); - return snprintf(buf, PAGE_SIZE, "event=0x%lx\n", - (unsigned long)eattr->var); + return sysfs_emit(buf, "event=0x%lx\n", (unsigned long)eattr->var); } static ssize_t dsu_pmu_sysfs_format_show(struct device *dev, @@ -146,7 +145,7 @@ static ssize_t dsu_pmu_sysfs_format_show(struct device *dev, { struct dev_ext_attribute *eattr = container_of(attr, struct dev_ext_attribute, attr); - return snprintf(buf, PAGE_SIZE, "%s\n", (char *)eattr->var); + return sysfs_emit(buf, "%s\n", (char *)eattr->var); } static ssize_t dsu_pmu_cpumask_show(struct device *dev, diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index 8ff7a67..fa9dfbc 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -560,7 +560,7 @@ static ssize_t smmu_pmu_identifier_attr_show(struct device *dev, { struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev)); - return snprintf(page, PAGE_SIZE, "0x%08x\n", smmu_pmu->iidr); + return sysfs_emit(page, "0x%08x\n", smmu_pmu->iidr); } static umode_t smmu_pmu_identifier_attr_visible(struct kobject *kobj, diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c index d3929cc..8a1e86a 100644 --- a/drivers/perf/arm_spe_pmu.c +++ b/drivers/perf/arm_spe_pmu.c @@ -126,8 +126,7 @@ static ssize_t arm_spe_pmu_cap_show(struct device *dev, container_of(attr, struct dev_ext_attribute, attr); int cap = (long)ea->var; - return snprintf(buf, PAGE_SIZE, "%u\n", - arm_spe_pmu_cap_get(spe_pmu, cap)); + return sysfs_emit(buf, "%u\n", arm_spe_pmu_cap_get(spe_pmu, cap)); } #define SPE_EXT_ATTR_ENTRY(_name, _func, _var) \ diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c index be1f26b..c126fd8 100644 --- a/drivers/perf/fsl_imx8_ddr_perf.c +++ b/drivers/perf/fsl_imx8_ddr_perf.c @@ -170,8 +170,7 @@ static ssize_t ddr_perf_filter_cap_show(struct device *dev, container_of(attr, struct dev_ext_attribute, attr); int cap = (long)ea->var; - return snprintf(buf, PAGE_SIZE, "%u\n", - ddr_perf_filter_cap_get(pmu, cap)); + return sysfs_emit(buf, "%u\n", ddr_perf_filter_cap_get(pmu, cap)); } #define PERF_EXT_ATTR_ENTRY(_name, _func, _var) \ diff --git a/drivers/perf/hisilicon/hisi_uncore_pmu.c b/drivers/perf/hisilicon/hisi_uncore_pmu.c index 9dbdc3f..64ccf5e 100644 --- a/drivers/perf/hisilicon/hisi_uncore_pmu.c +++ b/drivers/perf/hisilicon/hisi_uncore_pmu.c @@ -125,7 +125,7 @@ ssize_t hisi_uncore_pmu_identifier_attr_show(struct device *dev, { struct hisi_pmu *hisi_pmu = to_hisi_pmu(dev_get_drvdata(dev)); - return snprintf(page, PAGE_SIZE, "0x%08x\n", hisi_pmu->identifier); + return sysfs_emit(page, "0x%08x\n", hisi_pmu->identifier); } EXPORT_SYMBOL_GPL(hisi_uncore_pmu_identifier_attr_show); -- 2.8.1
Use the generic sysfs_emit_at() function take place of scnprintf() Signed-off-by: Qi Liu <liuqi115@huawei.com> --- drivers/perf/arm-ccn.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c index 3a2ddc0..0588f29 100644 --- a/drivers/perf/arm-ccn.c +++ b/drivers/perf/arm-ccn.c @@ -328,41 +328,37 @@ static ssize_t arm_ccn_pmu_event_show(struct device *dev, struct arm_ccn_pmu_event, attr); ssize_t res; - res = scnprintf(buf, PAGE_SIZE, "type=0x%x", event->type); + res = sysfs_emit(buf, "type=0x%x", event->type); if (event->event) - res += scnprintf(buf + res, PAGE_SIZE - res, ",event=0x%x", + res += sysfs_emit_at(buf + res, res, ",event=0x%x", event->event); if (event->def) - res += scnprintf(buf + res, PAGE_SIZE - res, ",%s", - event->def); + res += sysfs_emit_at(buf + res, res, ",%s", event->def); if (event->mask) - res += scnprintf(buf + res, PAGE_SIZE - res, ",mask=0x%x", - event->mask); + res += sysfs_emit_at(buf + res, res, ",mask=0x%x", event->mask); /* Arguments required by an event */ switch (event->type) { case CCN_TYPE_CYCLES: break; case CCN_TYPE_XP: - res += scnprintf(buf + res, PAGE_SIZE - res, - ",xp=?,vc=?"); + res += sysfs_emit(buf + res, res, ",xp=?,vc=?"); if (event->event == CCN_EVENT_WATCHPOINT) - res += scnprintf(buf + res, PAGE_SIZE - res, + res += sysfs_emit_at(buf + res, res, ",port=?,dir=?,cmp_l=?,cmp_h=?,mask=?"); else - res += scnprintf(buf + res, PAGE_SIZE - res, - ",bus=?"); + res += sysfs_emit_at(buf + res, res, ",bus=?"); break; case CCN_TYPE_MN: - res += scnprintf(buf + res, PAGE_SIZE - res, ",node=%d", ccn->mn_id); + res += sysfs_emit_at(buf + res, res, ",node=%d", ccn->mn_id); break; default: - res += scnprintf(buf + res, PAGE_SIZE - res, ",node=?"); + res += sysfs_emit_at(buf + res, res, ",node=?"); break; } - res += scnprintf(buf + res, PAGE_SIZE - res, "\n"); + res += sysfs_emit_at(buf + res, res, "\n"); return res; } -- 2.8.1
Hi Qi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.12-rc3 next-20210317] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Qi-Liu/drivers-perf-convert-sysfs-s... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1df27313f50a57497c1faeb6a6ae4ca939c85a7d config: arm64-randconfig-r003-20210317 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/81a69a2f7fa73d0c41d699d6c6993c259400... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Qi-Liu/drivers-perf-convert-sysfs-sprintf-snprintf-scnprintf-to-sysfs_emit/20210317-174750 git checkout 81a69a2f7fa73d0c41d699d6c6993c2594001241 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com> All warnings (new ones prefixed by >>): drivers/perf/arm-ccn.c: In function 'arm_ccn_pmu_event_show':
drivers/perf/arm-ccn.c:345:32: warning: passing argument 2 of 'sysfs_emit' makes pointer from integer without a cast [-Wint-conversion] 345 | res += sysfs_emit(buf + res, res, ",xp=?,vc=?"); | ^~~ | | | ssize_t {aka long int} In file included from include/linux/kobject.h:20, from include/linux/irqdesc.h:6, from include/linux/irq.h:584, from include/asm-generic/hardirq.h:17, from arch/arm64/include/asm/hardirq.h:17, from include/linux/hardirq.h:10, from include/linux/interrupt.h:11, from drivers/perf/arm-ccn.c:10: include/linux/sysfs.h:335:39: note: expected 'const char *' but argument is of type 'ssize_t' {aka 'long int'} 335 | int sysfs_emit(char *buf, const char *fmt, ...); | ~~~~~~~~~~~~^~~
vim +/sysfs_emit +345 drivers/perf/arm-ccn.c 274 275 #define CCN_EVENT_ATTR(_name) \ 276 __ATTR(_name, S_IRUGO, arm_ccn_pmu_event_show, NULL) 277 278 /* 279 * Events defined in TRM for MN, HN-I and SBSX are actually watchpoints set on 280 * their ports in XP they are connected to. For the sake of usability they are 281 * explicitly defined here (and translated into a relevant watchpoint in 282 * arm_ccn_pmu_event_init()) so the user can easily request them without deep 283 * knowledge of the flit format. 284 */ 285 286 #define CCN_EVENT_MN(_name, _def, _mask) { .attr = CCN_EVENT_ATTR(mn_##_name), \ 287 .type = CCN_TYPE_MN, .event = CCN_EVENT_WATCHPOINT, \ 288 .num_ports = CCN_NUM_XP_PORTS, .num_vcs = CCN_NUM_VCS, \ 289 .def = _def, .mask = _mask, } 290 291 #define CCN_EVENT_HNI(_name, _def, _mask) { \ 292 .attr = CCN_EVENT_ATTR(hni_##_name), .type = CCN_TYPE_HNI, \ 293 .event = CCN_EVENT_WATCHPOINT, .num_ports = CCN_NUM_XP_PORTS, \ 294 .num_vcs = CCN_NUM_VCS, .def = _def, .mask = _mask, } 295 296 #define CCN_EVENT_SBSX(_name, _def, _mask) { \ 297 .attr = CCN_EVENT_ATTR(sbsx_##_name), .type = CCN_TYPE_SBSX, \ 298 .event = CCN_EVENT_WATCHPOINT, .num_ports = CCN_NUM_XP_PORTS, \ 299 .num_vcs = CCN_NUM_VCS, .def = _def, .mask = _mask, } 300 301 #define CCN_EVENT_HNF(_name, _event) { .attr = CCN_EVENT_ATTR(hnf_##_name), \ 302 .type = CCN_TYPE_HNF, .event = _event, } 303 304 #define CCN_EVENT_XP(_name, _event) { .attr = CCN_EVENT_ATTR(xp_##_name), \ 305 .type = CCN_TYPE_XP, .event = _event, \ 306 .num_ports = CCN_NUM_XP_PORTS, .num_vcs = CCN_NUM_VCS, } 307 308 /* 309 * RN-I & RN-D (RN-D = RN-I + DVM) nodes have different type ID depending 310 * on configuration. One of them is picked to represent the whole group, 311 * as they all share the same event types. 312 */ 313 #define CCN_EVENT_RNI(_name, _event) { .attr = CCN_EVENT_ATTR(rni_##_name), \ 314 .type = CCN_TYPE_RNI_3P, .event = _event, } 315 316 #define CCN_EVENT_SBAS(_name, _event) { .attr = CCN_EVENT_ATTR(sbas_##_name), \ 317 .type = CCN_TYPE_SBAS, .event = _event, } 318 319 #define CCN_EVENT_CYCLES(_name) { .attr = CCN_EVENT_ATTR(_name), \ 320 .type = CCN_TYPE_CYCLES } 321 322 323 static ssize_t arm_ccn_pmu_event_show(struct device *dev, 324 struct device_attribute *attr, char *buf) 325 { 326 struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev)); 327 struct arm_ccn_pmu_event *event = container_of(attr, 328 struct arm_ccn_pmu_event, attr); 329 ssize_t res; 330 331 res = sysfs_emit(buf, "type=0x%x", event->type); 332 if (event->event) 333 res += sysfs_emit_at(buf + res, res, ",event=0x%x", 334 event->event); 335 if (event->def) 336 res += sysfs_emit_at(buf + res, res, ",%s", event->def); 337 if (event->mask) 338 res += sysfs_emit_at(buf + res, res, ",mask=0x%x", event->mask); 339 340 /* Arguments required by an event */ 341 switch (event->type) { 342 case CCN_TYPE_CYCLES: 343 break; 344 case CCN_TYPE_XP:
345 res += sysfs_emit(buf + res, res, ",xp=?,vc=?"); 346 if (event->event == CCN_EVENT_WATCHPOINT) 347 res += sysfs_emit_at(buf + res, res, 348 ",port=?,dir=?,cmp_l=?,cmp_h=?,mask=?"); 349 else 350 res += sysfs_emit_at(buf + res, res, ",bus=?"); 351 352 break; 353 case CCN_TYPE_MN: 354 res += sysfs_emit_at(buf + res, res, ",node=%d", ccn->mn_id); 355 break; 356 default: 357 res += sysfs_emit_at(buf + res, res, ",node=?"); 358 break; 359 } 360 361 res += sysfs_emit_at(buf + res, res, "\n"); 362 363 return res; 364 } 365
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Hi Qi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.12-rc3 next-20210317] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Qi-Liu/drivers-perf-convert-sysfs-s... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1df27313f50a57497c1faeb6a6ae4ca939c85a7d config: arm64-randconfig-s031-20210317 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-277-gc089cd2d-dirty # https://github.com/0day-ci/linux/commit/81a69a2f7fa73d0c41d699d6c6993c259400... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Qi-Liu/drivers-perf-convert-sysfs-sprintf-snprintf-scnprintf-to-sysfs_emit/20210317-174750 git checkout 81a69a2f7fa73d0c41d699d6c6993c2594001241 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com> sparse warnings: (new ones prefixed by >>)
drivers/perf/arm-ccn.c:345:46: sparse: sparse: incorrect type in argument 2 (different base types) @@ expected char const *fmt @@ got long [assigned] [usertype] res @@ drivers/perf/arm-ccn.c:345:46: sparse: expected char const *fmt drivers/perf/arm-ccn.c:345:46: sparse: got long [assigned] [usertype] res
vim +345 drivers/perf/arm-ccn.c 274 275 #define CCN_EVENT_ATTR(_name) \ 276 __ATTR(_name, S_IRUGO, arm_ccn_pmu_event_show, NULL) 277 278 /* 279 * Events defined in TRM for MN, HN-I and SBSX are actually watchpoints set on 280 * their ports in XP they are connected to. For the sake of usability they are 281 * explicitly defined here (and translated into a relevant watchpoint in 282 * arm_ccn_pmu_event_init()) so the user can easily request them without deep 283 * knowledge of the flit format. 284 */ 285 286 #define CCN_EVENT_MN(_name, _def, _mask) { .attr = CCN_EVENT_ATTR(mn_##_name), \ 287 .type = CCN_TYPE_MN, .event = CCN_EVENT_WATCHPOINT, \ 288 .num_ports = CCN_NUM_XP_PORTS, .num_vcs = CCN_NUM_VCS, \ 289 .def = _def, .mask = _mask, } 290 291 #define CCN_EVENT_HNI(_name, _def, _mask) { \ 292 .attr = CCN_EVENT_ATTR(hni_##_name), .type = CCN_TYPE_HNI, \ 293 .event = CCN_EVENT_WATCHPOINT, .num_ports = CCN_NUM_XP_PORTS, \ 294 .num_vcs = CCN_NUM_VCS, .def = _def, .mask = _mask, } 295 296 #define CCN_EVENT_SBSX(_name, _def, _mask) { \ 297 .attr = CCN_EVENT_ATTR(sbsx_##_name), .type = CCN_TYPE_SBSX, \ 298 .event = CCN_EVENT_WATCHPOINT, .num_ports = CCN_NUM_XP_PORTS, \ 299 .num_vcs = CCN_NUM_VCS, .def = _def, .mask = _mask, } 300 301 #define CCN_EVENT_HNF(_name, _event) { .attr = CCN_EVENT_ATTR(hnf_##_name), \ 302 .type = CCN_TYPE_HNF, .event = _event, } 303 304 #define CCN_EVENT_XP(_name, _event) { .attr = CCN_EVENT_ATTR(xp_##_name), \ 305 .type = CCN_TYPE_XP, .event = _event, \ 306 .num_ports = CCN_NUM_XP_PORTS, .num_vcs = CCN_NUM_VCS, } 307 308 /* 309 * RN-I & RN-D (RN-D = RN-I + DVM) nodes have different type ID depending 310 * on configuration. One of them is picked to represent the whole group, 311 * as they all share the same event types. 312 */ 313 #define CCN_EVENT_RNI(_name, _event) { .attr = CCN_EVENT_ATTR(rni_##_name), \ 314 .type = CCN_TYPE_RNI_3P, .event = _event, } 315 316 #define CCN_EVENT_SBAS(_name, _event) { .attr = CCN_EVENT_ATTR(sbas_##_name), \ 317 .type = CCN_TYPE_SBAS, .event = _event, } 318 319 #define CCN_EVENT_CYCLES(_name) { .attr = CCN_EVENT_ATTR(_name), \ 320 .type = CCN_TYPE_CYCLES } 321 322 323 static ssize_t arm_ccn_pmu_event_show(struct device *dev, 324 struct device_attribute *attr, char *buf) 325 { 326 struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev)); 327 struct arm_ccn_pmu_event *event = container_of(attr, 328 struct arm_ccn_pmu_event, attr); 329 ssize_t res; 330 331 res = sysfs_emit(buf, "type=0x%x", event->type); 332 if (event->event) 333 res += sysfs_emit_at(buf + res, res, ",event=0x%x", 334 event->event); 335 if (event->def) 336 res += sysfs_emit_at(buf + res, res, ",%s", event->def); 337 if (event->mask) 338 res += sysfs_emit_at(buf + res, res, ",mask=0x%x", event->mask); 339 340 /* Arguments required by an event */ 341 switch (event->type) { 342 case CCN_TYPE_CYCLES: 343 break; 344 case CCN_TYPE_XP:
345 res += sysfs_emit(buf + res, res, ",xp=?,vc=?"); 346 if (event->event == CCN_EVENT_WATCHPOINT) 347 res += sysfs_emit_at(buf + res, res, 348 ",port=?,dir=?,cmp_l=?,cmp_h=?,mask=?"); 349 else 350 res += sysfs_emit_at(buf + res, res, ",bus=?"); 351 352 break; 353 case CCN_TYPE_MN: 354 res += sysfs_emit_at(buf + res, res, ",node=%d", ccn->mn_id); 355 break; 356 default: 357 res += sysfs_emit_at(buf + res, res, ",node=?"); 358 break; 359 } 360 361 res += sysfs_emit_at(buf + res, res, "\n"); 362 363 return res; 364 } 365
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
On Wed, 2021-03-17 at 17:41 +0800, Qi Liu wrote:
Use the generic sysfs_emit_at() function take place of scnprintf() [] diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c [] @@ -328,41 +328,37 @@ static ssize_t arm_ccn_pmu_event_show(struct device *dev, struct arm_ccn_pmu_event, attr); ssize_t res;
- res = scnprintf(buf, PAGE_SIZE, "type=0x%x", event->type); + res = sysfs_emit(buf, "type=0x%x", event->type); if (event->event) - res += scnprintf(buf + res, PAGE_SIZE - res, ",event=0x%x", + res += sysfs_emit_at(buf + res, res, ",event=0x%x", event->event);
sysfs_emit_at should always use buf, not buf + offset. res should be int and is the offset from buf for the output so the form should be similar to int len; len = sysfs_emit(buf, "type=0x%x", event->type); if (event->event) { len += sysfs_emit_at(buf, len, ",event=0x%x", event->event); etc...
On 2021/3/17 22:57, Joe Perches wrote:
On Wed, 2021-03-17 at 17:41 +0800, Qi Liu wrote:
Use the generic sysfs_emit_at() function take place of scnprintf() [] diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c [] @@ -328,41 +328,37 @@ static ssize_t arm_ccn_pmu_event_show(struct device *dev, struct arm_ccn_pmu_event, attr); ssize_t res;
- res = scnprintf(buf, PAGE_SIZE, "type=0x%x", event->type); + res = sysfs_emit(buf, "type=0x%x", event->type); if (event->event) - res += scnprintf(buf + res, PAGE_SIZE - res, ",event=0x%x", + res += sysfs_emit_at(buf + res, res, ",event=0x%x", event->event);
sysfs_emit_at should always use buf, not buf + offset. res should be int and is the offset from buf for the output
so the form should be similar to
int len;
len = sysfs_emit(buf, "type=0x%x", event->type); if (event->event) { len += sysfs_emit_at(buf, len, ",event=0x%x", event->event);
etc...
Hi Joe, I'll fix the use of sysfs_emit_at in next version, thanks. But I think it's better to keep the res as ssize_t, as the return value of this function is ssize_t. Thanks, Qi
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On Thu, 2021-03-18 at 17:33 +0800, liuqi (BA) wrote:
On 2021/3/17 22:57, Joe Perches wrote:
On Wed, 2021-03-17 at 17:41 +0800, Qi Liu wrote:
Use the generic sysfs_emit_at() function take place of scnprintf() [] diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c [] @@ -328,41 +328,37 @@ static ssize_t arm_ccn_pmu_event_show(struct device *dev, struct arm_ccn_pmu_event, attr); ssize_t res;
- res = scnprintf(buf, PAGE_SIZE, "type=0x%x", event->type); + res = sysfs_emit(buf, "type=0x%x", event->type); if (event->event) - res += scnprintf(buf + res, PAGE_SIZE - res, ",event=0x%x", + res += sysfs_emit_at(buf + res, res, ",event=0x%x", event->event);
sysfs_emit_at should always use buf, not buf + offset. res should be int and is the offset from buf for the output
so the form should be similar to
int len;
len = sysfs_emit(buf, "type=0x%x", event->type); if (event->event) { len += sysfs_emit_at(buf, len, ",event=0x%x", event->event);
etc...
Hi Joe,
I'll fix the use of sysfs_emit_at in next version, thanks. But I think it's better to keep the res as ssize_t, as the return value of this function is ssize_t.
The 2nd arg of sysfs_emit_at is int. On 64 bit platforms, ssize_t is 64 bit while int is 32. If res (or len) is ssize_t, there could be a lot of -Wconversion warnings like this produced when using make W= warning: conversion from ‘ssize_t’ {aka ‘long int’} to ‘int’ may change value [-Wconversion] 262 | len += sysfs_emit_at(buf, len, "\n");
Hi Qi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.12-rc3 next-20210317] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Qi-Liu/drivers-perf-convert-sysfs-s... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1df27313f50a57497c1faeb6a6ae4ca939c85a7d config: arm-randconfig-r036-20210317 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8ef111222a3dd12a9175f69c3bff598c46e8bdf7) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/81a69a2f7fa73d0c41d699d6c6993c259400... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Qi-Liu/drivers-perf-convert-sysfs-sprintf-snprintf-scnprintf-to-sysfs_emit/20210317-174750 git checkout 81a69a2f7fa73d0c41d699d6c6993c2594001241 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com> All warnings (new ones prefixed by >>):
drivers/perf/arm-ccn.c:345:32: warning: incompatible integer to pointer conversion passing 'ssize_t' (aka 'int') to parameter of type 'const char *' [-Wint-conversion] res += sysfs_emit(buf + res, res, ",xp=?,vc=?"); ^~~ include/linux/sysfs.h:335:39: note: passing argument to parameter 'fmt' here int sysfs_emit(char *buf, const char *fmt, ...); ^ 1 warning generated.
vim +345 drivers/perf/arm-ccn.c 274 275 #define CCN_EVENT_ATTR(_name) \ 276 __ATTR(_name, S_IRUGO, arm_ccn_pmu_event_show, NULL) 277 278 /* 279 * Events defined in TRM for MN, HN-I and SBSX are actually watchpoints set on 280 * their ports in XP they are connected to. For the sake of usability they are 281 * explicitly defined here (and translated into a relevant watchpoint in 282 * arm_ccn_pmu_event_init()) so the user can easily request them without deep 283 * knowledge of the flit format. 284 */ 285 286 #define CCN_EVENT_MN(_name, _def, _mask) { .attr = CCN_EVENT_ATTR(mn_##_name), \ 287 .type = CCN_TYPE_MN, .event = CCN_EVENT_WATCHPOINT, \ 288 .num_ports = CCN_NUM_XP_PORTS, .num_vcs = CCN_NUM_VCS, \ 289 .def = _def, .mask = _mask, } 290 291 #define CCN_EVENT_HNI(_name, _def, _mask) { \ 292 .attr = CCN_EVENT_ATTR(hni_##_name), .type = CCN_TYPE_HNI, \ 293 .event = CCN_EVENT_WATCHPOINT, .num_ports = CCN_NUM_XP_PORTS, \ 294 .num_vcs = CCN_NUM_VCS, .def = _def, .mask = _mask, } 295 296 #define CCN_EVENT_SBSX(_name, _def, _mask) { \ 297 .attr = CCN_EVENT_ATTR(sbsx_##_name), .type = CCN_TYPE_SBSX, \ 298 .event = CCN_EVENT_WATCHPOINT, .num_ports = CCN_NUM_XP_PORTS, \ 299 .num_vcs = CCN_NUM_VCS, .def = _def, .mask = _mask, } 300 301 #define CCN_EVENT_HNF(_name, _event) { .attr = CCN_EVENT_ATTR(hnf_##_name), \ 302 .type = CCN_TYPE_HNF, .event = _event, } 303 304 #define CCN_EVENT_XP(_name, _event) { .attr = CCN_EVENT_ATTR(xp_##_name), \ 305 .type = CCN_TYPE_XP, .event = _event, \ 306 .num_ports = CCN_NUM_XP_PORTS, .num_vcs = CCN_NUM_VCS, } 307 308 /* 309 * RN-I & RN-D (RN-D = RN-I + DVM) nodes have different type ID depending 310 * on configuration. One of them is picked to represent the whole group, 311 * as they all share the same event types. 312 */ 313 #define CCN_EVENT_RNI(_name, _event) { .attr = CCN_EVENT_ATTR(rni_##_name), \ 314 .type = CCN_TYPE_RNI_3P, .event = _event, } 315 316 #define CCN_EVENT_SBAS(_name, _event) { .attr = CCN_EVENT_ATTR(sbas_##_name), \ 317 .type = CCN_TYPE_SBAS, .event = _event, } 318 319 #define CCN_EVENT_CYCLES(_name) { .attr = CCN_EVENT_ATTR(_name), \ 320 .type = CCN_TYPE_CYCLES } 321 322 323 static ssize_t arm_ccn_pmu_event_show(struct device *dev, 324 struct device_attribute *attr, char *buf) 325 { 326 struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev)); 327 struct arm_ccn_pmu_event *event = container_of(attr, 328 struct arm_ccn_pmu_event, attr); 329 ssize_t res; 330 331 res = sysfs_emit(buf, "type=0x%x", event->type); 332 if (event->event) 333 res += sysfs_emit_at(buf + res, res, ",event=0x%x", 334 event->event); 335 if (event->def) 336 res += sysfs_emit_at(buf + res, res, ",%s", event->def); 337 if (event->mask) 338 res += sysfs_emit_at(buf + res, res, ",mask=0x%x", event->mask); 339 340 /* Arguments required by an event */ 341 switch (event->type) { 342 case CCN_TYPE_CYCLES: 343 break; 344 case CCN_TYPE_XP:
345 res += sysfs_emit(buf + res, res, ",xp=?,vc=?"); 346 if (event->event == CCN_EVENT_WATCHPOINT) 347 res += sysfs_emit_at(buf + res, res, 348 ",port=?,dir=?,cmp_l=?,cmp_h=?,mask=?"); 349 else 350 res += sysfs_emit_at(buf + res, res, ",bus=?"); 351 352 break; 353 case CCN_TYPE_MN: 354 res += sysfs_emit_at(buf + res, res, ",node=%d", ccn->mn_id); 355 break; 356 default: 357 res += sysfs_emit_at(buf + res, res, ",node=?"); 358 break; 359 } 360 361 res += sysfs_emit_at(buf + res, res, "\n"); 362 363 return res; 364 } 365
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
sprintf does not know the PAGE_SIZE maximum of the temporary buffer used for sysfs content and it's possible to overrun the buffer length. Use sysfs_emit() function to ensures that no overrun is done. Signed-off-by: Qi Liu <liuqi115@huawei.com> --- drivers/perf/arm_dmc620_pmu.c | 2 +- drivers/perf/arm_smmuv3_pmu.c | 2 +- drivers/perf/fsl_imx8_ddr_perf.c | 4 ++-- drivers/perf/hisilicon/hisi_uncore_pmu.c | 6 +++--- drivers/perf/qcom_l2_pmu.c | 2 +- drivers/perf/qcom_l3_pmu.c | 4 ++-- drivers/perf/thunderx2_pmu.c | 4 ++-- drivers/perf/xgene_pmu.c | 4 ++-- 8 files changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/perf/arm_dmc620_pmu.c b/drivers/perf/arm_dmc620_pmu.c index 66ad5b3..8e9002a 100644 --- a/drivers/perf/arm_dmc620_pmu.c +++ b/drivers/perf/arm_dmc620_pmu.c @@ -113,7 +113,7 @@ dmc620_pmu_event_show(struct device *dev, eattr = container_of(attr, typeof(*eattr), attr); - return sprintf(page, "event=0x%x,clkdiv2=0x%x\n", eattr->eventid, eattr->clkdiv2); + return sysfs_emit(page, "event=0x%x,clkdiv2=0x%x\n", eattr->eventid, eattr->clkdiv2); } #define DMC620_PMU_EVENT_ATTR(_name, _eventid, _clkdiv2) \ diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index fa9dfbc..45a399f 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -506,7 +506,7 @@ static ssize_t smmu_pmu_event_show(struct device *dev, pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); - return sprintf(page, "event=0x%02llx\n", pmu_attr->id); + return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id); } #define SMMU_EVENT_ATTR(name, config) \ diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c index c126fd8..2bbb931 100644 --- a/drivers/perf/fsl_imx8_ddr_perf.c +++ b/drivers/perf/fsl_imx8_ddr_perf.c @@ -110,7 +110,7 @@ static ssize_t ddr_perf_identifier_show(struct device *dev, { struct ddr_pmu *pmu = dev_get_drvdata(dev); - return sprintf(page, "%s\n", pmu->devtype_data->identifier); + return sysfs_emit(page, "%s\n", pmu->devtype_data->identifier); } static umode_t ddr_perf_identifier_attr_visible(struct kobject *kobj, @@ -219,7 +219,7 @@ ddr_pmu_event_show(struct device *dev, struct device_attribute *attr, struct perf_pmu_events_attr *pmu_attr; pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); - return sprintf(page, "event=0x%02llx\n", pmu_attr->id); + return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id); } #define IMX8_DDR_PMU_EVENT_ATTR(_name, _id) \ diff --git a/drivers/perf/hisilicon/hisi_uncore_pmu.c b/drivers/perf/hisilicon/hisi_uncore_pmu.c index 64ccf5e..5e2b5e1 100644 --- a/drivers/perf/hisilicon/hisi_uncore_pmu.c +++ b/drivers/perf/hisilicon/hisi_uncore_pmu.c @@ -33,7 +33,7 @@ ssize_t hisi_format_sysfs_show(struct device *dev, eattr = container_of(attr, struct dev_ext_attribute, attr); - return sprintf(buf, "%s\n", (char *)eattr->var); + return sysfs_emit(buf, "%s\n", (char *)eattr->var); } EXPORT_SYMBOL_GPL(hisi_format_sysfs_show); @@ -47,7 +47,7 @@ ssize_t hisi_event_sysfs_show(struct device *dev, eattr = container_of(attr, struct dev_ext_attribute, attr); - return sprintf(page, "config=0x%lx\n", (unsigned long)eattr->var); + return sysfs_emit(page, "config=0x%lx\n", (unsigned long)eattr->var); } EXPORT_SYMBOL_GPL(hisi_event_sysfs_show); @@ -59,7 +59,7 @@ ssize_t hisi_cpumask_sysfs_show(struct device *dev, { struct hisi_pmu *hisi_pmu = to_hisi_pmu(dev_get_drvdata(dev)); - return sprintf(buf, "%d\n", hisi_pmu->on_cpu); + return sysfs_emit(buf, "%d\n", hisi_pmu->on_cpu); } EXPORT_SYMBOL_GPL(hisi_cpumask_sysfs_show); diff --git a/drivers/perf/qcom_l2_pmu.c b/drivers/perf/qcom_l2_pmu.c index 8883af9..fc54a80 100644 --- a/drivers/perf/qcom_l2_pmu.c +++ b/drivers/perf/qcom_l2_pmu.c @@ -676,7 +676,7 @@ static ssize_t l2cache_pmu_event_show(struct device *dev, struct perf_pmu_events_attr *pmu_attr; pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); - return sprintf(page, "event=0x%02llx\n", pmu_attr->id); + return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id); } #define L2CACHE_EVENT_ATTR(_name, _id) \ diff --git a/drivers/perf/qcom_l3_pmu.c b/drivers/perf/qcom_l3_pmu.c index fb34b87..bba0780 100644 --- a/drivers/perf/qcom_l3_pmu.c +++ b/drivers/perf/qcom_l3_pmu.c @@ -615,7 +615,7 @@ static ssize_t l3cache_pmu_format_show(struct device *dev, struct dev_ext_attribute *eattr; eattr = container_of(attr, struct dev_ext_attribute, attr); - return sprintf(buf, "%s\n", (char *) eattr->var); + return sysfs_emit(buf, "%s\n", (char *) eattr->var); } #define L3CACHE_PMU_FORMAT_ATTR(_name, _config) \ @@ -643,7 +643,7 @@ static ssize_t l3cache_pmu_event_show(struct device *dev, struct perf_pmu_events_attr *pmu_attr; pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); - return sprintf(page, "event=0x%02llx\n", pmu_attr->id); + return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id); } #define L3CACHE_EVENT_ATTR(_name, _id) \ diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c index e116815..06a6d56 100644 --- a/drivers/perf/thunderx2_pmu.c +++ b/drivers/perf/thunderx2_pmu.c @@ -128,7 +128,7 @@ __tx2_pmu_##_var##_show(struct device *dev, \ char *page) \ { \ BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \ - return sprintf(page, _format "\n"); \ + return sysfs_emit(page, _format "\n"); \ } \ \ static struct device_attribute format_attr_##_var = \ @@ -176,7 +176,7 @@ static ssize_t tx2_pmu_event_show(struct device *dev, struct dev_ext_attribute *eattr; eattr = container_of(attr, struct dev_ext_attribute, attr); - return sprintf(buf, "event=0x%lx\n", (unsigned long) eattr->var); + return sysfs_emit(buf, "event=0x%lx\n", (unsigned long) eattr->var); } #define TX2_EVENT_ATTR(name, config) \ diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c index 44faa51..ffe3bde 100644 --- a/drivers/perf/xgene_pmu.c +++ b/drivers/perf/xgene_pmu.c @@ -170,7 +170,7 @@ static ssize_t xgene_pmu_format_show(struct device *dev, struct dev_ext_attribute *eattr; eattr = container_of(attr, struct dev_ext_attribute, attr); - return sprintf(buf, "%s\n", (char *) eattr->var); + return sysfs_emit(buf, "%s\n", (char *) eattr->var); } #define XGENE_PMU_FORMAT_ATTR(_name, _config) \ @@ -281,7 +281,7 @@ static ssize_t xgene_pmu_event_show(struct device *dev, struct dev_ext_attribute *eattr; eattr = container_of(attr, struct dev_ext_attribute, attr); - return sprintf(buf, "config=0x%lx\n", (unsigned long) eattr->var); + return sysfs_emit(buf, "config=0x%lx\n", (unsigned long) eattr->var); } #define XGENE_PMU_EVENT_ATTR(_name, _config) \ -- 2.8.1
participants (4)
-
Joe Perches -
kernel test robot -
liuqi (BA) -
Qi Liu