January 2024 - Kernel - mailweb.openeuler.org

[PATCH OLK-6.6] blk-mq: avoid housekeeping CPUs scheduling a worker on a non-housekeeping CPU
by Xiongfeng Wang 23 Jan '24

23 Jan '24

hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8YB4M CVE: N/A --------------------------------- When NOHZ_FULL is enabled, such as in HPC situation, CPUs are divided into housekeeping CPUs and non-housekeeping CPUs. Non-housekeeping CPUs are NOHZ_FULL CPUs and are often monopolized by the userspace process, such HPC application process. Any sort of interruption is not expected. blk_mq_hctx_next_cpu() selects each cpu in 'hctx->cpumask' alternately to schedule the work thread blk_mq_run_work_fn(). When 'hctx->cpumask' contains housekeeping CPU and non-housekeeping CPU at the same time, a housekeeping CPU, which want to request a IO, may schedule a worker on a non-housekeeping CPU. This may affect the performance of the userspace application running on non-housekeeping CPUs. So let's just schedule the worker thread on the current CPU when the current CPU is housekeeping CPU. Signed-off-by: Xiongfeng Wang <wangxiongfeng2(a)huawei.com> Conflicts: block/blk-mq.c include/linux/sched/isolation.h Signed-off-by: Xiongfeng Wang <wangxiongfeng2(a)huawei.com> --- block/blk-mq.c | 11 ++++++++++- include/linux/sched/isolation.h | 3 +++ kernel/sched/isolation.c | 8 ++++++++ 3 files changed, 21 insertions(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 6ab7f360ff2a..52cfbeb75355 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -24,6 +24,7 @@ #include <linux/sched/sysctl.h> #include <linux/sched/topology.h> #include <linux/sched/signal.h> +#include <linux/sched/isolation.h> #include <linux/delay.h> #include <linux/crash_dump.h> #include <linux/prefetch.h> @@ -2214,9 +2215,17 @@ static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx) */ void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) { + int work_cpu; + if (unlikely(blk_mq_hctx_stopped(hctx))) return; - kblockd_mod_delayed_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work, + + if (enhanced_isolcpus && tick_nohz_full_enabled() && + housekeeping_cpu(raw_smp_processor_id(), HK_TYPE_WQ)) + work_cpu = raw_smp_processor_id(); + else + work_cpu = blk_mq_hctx_next_cpu(hctx); + kblockd_mod_delayed_work_on(work_cpu, &hctx->run_work, msecs_to_jiffies(msecs)); } EXPORT_SYMBOL(blk_mq_delay_run_hw_queue); diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index fe1a46f30d24..3894e74e8dc5 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -19,6 +19,7 @@ enum hk_type { }; #ifdef CONFIG_CPU_ISOLATION +extern bool enhanced_isolcpus; DECLARE_STATIC_KEY_FALSE(housekeeping_overridden); extern int housekeeping_any_cpu(enum hk_type type); extern const struct cpumask *housekeeping_cpumask(enum hk_type type); @@ -29,6 +30,8 @@ extern void __init housekeeping_init(void); #else +#define enhanced_isolcpus 0 + static inline int housekeeping_any_cpu(enum hk_type type) { return smp_processor_id(); diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index 373d42c707bc..3884c245faf5 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -239,3 +239,11 @@ static int __init housekeeping_isolcpus_setup(char *str) return housekeeping_setup(str, flags); } __setup("isolcpus=", housekeeping_isolcpus_setup); + +bool enhanced_isolcpus; +static int __init enhanced_isolcpus_setup(char *str) +{ + enhanced_isolcpus = true; + return 0; +} +__setup("enhanced_isolcpus", enhanced_isolcpus_setup); -- 2.20.1

2 1

[PATCH OLK-6.6 0/1] misc for controlling fd
by Chen Ridong 23 Jan '24

23 Jan '24

Chen Ridong (1): cgrou/misc: misc for controlling fd fs/Makefile | 1 - fs/file.c | 16 +-- include/linux/fd-misc.h | 18 ++++ include/linux/fdtable.h | 1 + include/linux/files-cgroup.h | 33 +++++++ include/linux/filescontrol.h | 99 ++++++++++++++++--- include/linux/misc_cgroup.h | 2 + kernel/cgroup/Makefile | 2 + .../cgroup/files-cgroup.c | 18 +--- kernel/cgroup/misc-fd.c | 91 +++++++++++++++++ kernel/cgroup/misc.c | 2 + 11 files changed, 245 insertions(+), 38 deletions(-) create mode 100644 include/linux/fd-misc.h create mode 100644 include/linux/files-cgroup.h rename fs/filescontrol.c => kernel/cgroup/files-cgroup.c (95%) create mode 100644 kernel/cgroup/misc-fd.c -- 2.34.1

2 2

[PATCH OLK-5.10] block: remove precise_iostat
by Li Nan 23 Jan '24

23 Jan '24

hulk inclusion category: bugfix bugzilla: 189480, https://gitee.com/openeuler/kernel/issues/I8Y90H -------------------------------- Previously, we believed it would be too costly to sum all the percpu variables 'in_flight' every jiffy if we want to count io accurately. So we added switch 'precise_iostat' and set it to false be default. However, the overhead of precise_iostat is 1. inc and dev in_flight when submitting io and done io 2. read in_flight up to HZ times per second It is much lower than our previous evaluation and can be ignored. Now, turn on the switch by default. And it will be removed in the feature. Signed-off-by: Li Nan <linan122(a)huawei.com> --- block/blk-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index 3564de78f102..f91f8e8be482 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -62,7 +62,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(block_unplug); DEFINE_IDA(blk_queue_ida); -bool precise_iostat; +bool precise_iostat = true; static int __init precise_iostat_setup(char *str) { -- 2.39.2

2 1

[PATCH OLK-5.10] block: remove precise_iostat
by Li Nan 23 Jan '24

23 Jan '24

hulk inclusion category: bugfix bugzilla: 189480, https://gitee.com/openeuler/kernel/issues/I8Y90L -------------------------------- Previously, we believed it would be too costly to sum all the percpu variables 'in_flight' every jiffy if we want to count io accurately. So we added switch 'precise_iostat' and set it to false be default. However, the overhead of precise_iostat is 1. inc and dev in_flight when submitting io and done io 2. read in_flight up to HZ times per second It is much lower than our previous evaluation and can be ignored. Now, turn on the switch by default. And it will be removed in the feature. Signed-off-by: Li Nan <linan122(a)huawei.com> --- block/blk-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index 3564de78f102..f91f8e8be482 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -62,7 +62,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(block_unplug); DEFINE_IDA(blk_queue_ida); -bool precise_iostat; +bool precise_iostat = true; static int __init precise_iostat_setup(char *str) { -- 2.39.2

2 1

[PATCH OLK-6.6 0/1] arm64: Add CONFIG_IPI_AS_NMI to IPI as NMI feature
by Liao Chen 23 Jan '24

23 Jan '24

This patch adds CONFIG_IPI_AS_NMI to control the availability of pseudo NMIs, which follows upstream commit 41ddf73f9f7e (arm64: Add framework to turn IPI as NMI). CONFIG_IPI_AS_NMI depends on: ARM64_PSEUDO_NMI=y Liao Chen (1): arm64: Add CONFIG_IPI_AS_NMI to IPI as NMI feature arch/arm64/Kconfig | 12 +++++++++++- arch/arm64/include/asm/irq.h | 2 +- arch/arm64/kernel/Makefile | 3 ++- arch/arm64/kernel/kgdb.c | 2 ++ arch/arm64/kernel/smp.c | 6 ++++++ include/linux/kgdb.h | 2 ++ kernel/debug/debug_core.c | 6 ++++++ 7 files changed, 30 insertions(+), 3 deletions(-) -- 2.34.1

2 2

[PATCH OLK-6.6 v2] tcp: fix compilation issue when CONFIG_SYSCTL is disabled
by Zhengchao Shao 23 Jan '24

23 Jan '24

hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8Y7PX CVE: NA -------------------------------- The following error is reported when the kernel is compiled with CONFIG_SYSCTL disabled: aarch64-linux-ld: net/ipv4/inet_hashtables.o: in function `__inet_hash_connect': inet_hashtables.c:(.text+0x3564): undefined reference to `sysctl_local_port_allocation' aarch64-linux-ld: net/ipv4/inet_hashtables.o: relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `sysctl_local_port_allocation' which may bind externally can not be used when making a shared object; recompile with -fPIC >> inet_hashtables.c:(.text+0x3564): dangerous relocation: unsupported relocation aarch64-linux-ld: inet_hashtables.c:(.text+0x3568): undefined reference to `sysctl_local_port_allocation' aarch64-linux-ld: inet_hashtables.c:(.text+0x3580): undefined reference to `sysctl_local_port_allocation' When CONFIG_SYSCTL is disabled, sysctl_local_port_allocation is undefined. Fixes: 208a72041292 ("tcp/dccp: Add another way to allocate local ports in connect()") Reported-by: kernel test robot <lkp(a)intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202401180939.2N529UUe-lkp@intel.com/ Signed-off-by: Zhengchao Shao <shaozhengchao(a)huawei.com> --- v2: move sysctl_local_port_allocation to inet_hashtables.c --- net/ipv4/inet_hashtables.c | 2 ++ net/ipv4/sysctl_net_ipv4.c | 1 - 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index a24dcf39e9ae..6fb12a4d86af 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -28,6 +28,8 @@ #include <net/tcp.h> #include <net/sock_reuseport.h> +int sysctl_local_port_allocation = 0; + u32 inet_ehashfn(const struct net *net, const __be32 laddr, const __u16 lport, const __be32 faddr, const __be16 fport) diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index f212133b05e9..64b3bfcbfa25 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -39,7 +39,6 @@ static unsigned long ip_ping_group_range_min[] = { 0, 0 }; static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX }; static u32 u32_max_div_HZ = UINT_MAX / HZ; static int one_day_secs = 24 * 3600; -int sysctl_local_port_allocation; static u32 fib_multipath_hash_fields_all_mask __maybe_unused = FIB_MULTIPATH_HASH_FIELD_ALL_MASK; static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024; -- 2.34.1

2 1

[PATCH OLK-6.6] tcp: fix compilation issue when CONFIG_SYSCTL is disabled
by Zhengchao Shao 23 Jan '24

23 Jan '24

hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8Y7PX CVE: NA -------------------------------- The following error is reported when the kernel is compiled with CONFIG_SYSCTL disabled: aarch64-linux-ld: net/ipv4/inet_hashtables.o: in function `__inet_hash_connect': inet_hashtables.c:(.text+0x3564): undefined reference to `sysctl_local_port_allocation' aarch64-linux-ld: net/ipv4/inet_hashtables.o: relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `sysctl_local_port_allocation' which may bind externally can not be used when making a shared object; recompile with -fPIC >> inet_hashtables.c:(.text+0x3564): dangerous relocation: unsupported relocation aarch64-linux-ld: inet_hashtables.c:(.text+0x3568): undefined reference to `sysctl_local_port_allocation' aarch64-linux-ld: inet_hashtables.c:(.text+0x3580): undefined reference to `sysctl_local_port_allocation' When CONFIG_SYSCTL is disabled, sysctl_local_port_allocation is undefined. Fixes: 208a72041292 ("tcp/dccp: Add another way to allocate local ports in connect()") Reported-by: kernel test robot <lkp(a)intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202401180939.2N529UUe-lkp@intel.com/ Signed-off-by: Zhengchao Shao <shaozhengchao(a)huawei.com> --- net/ipv4/inet_hashtables.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index a24dcf39e9ae..14da0ce40bad 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -1011,7 +1011,10 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row, struct inet_bind_bucket *tb; bool tb_created = false; u32 remaining, offset; - int ret, i, low, high, span_size; + int ret, i, low, high; +#if IS_ENABLED(CONFIG_SYSCTL) + int span_size; +#endif int l3mdev; u32 index; @@ -1021,11 +1024,13 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row, local_bh_enable(); return ret; } +#if IS_ENABLED(CONFIG_SYSCTL) /* local_port_allocation 0 means even and odd port allocation strategy * will be applied, so span size is 2; otherwise sequential allocation * will be used and span size is 1. Default value is 0. */ span_size = sysctl_local_port_allocation ? 1 : 2; +#endif l3mdev = inet_sk_bound_l3mdev(sk); @@ -1048,7 +1053,11 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row, offset &= ~1U; other_parity_scan: port = low + offset; +#if IS_ENABLED(CONFIG_SYSCTL) for (i = 0; i < remaining; i += span_size, port += span_size) { +#else + for (i = 0; i < remaining; i += 2, port += 2) { +#endif if (unlikely(port >= high)) port -= remaining; if (inet_is_local_reserved_port(net, port)) @@ -1089,7 +1098,11 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row, } offset++; +#if IS_ENABLED(CONFIG_SYSCTL) if ((offset & 1) && remaining > 1 && span_size == 2) +#else + if ((offset & 1) && remaining > 1) +#endif goto other_parity_scan; return -EADDRNOTAVAIL; -- 2.34.1

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[openeuler:OLK-5.10 26782/30000] drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c:1030:27: warning: unused variable 'hdev'
by kernel test robot 23 Jan '24

23 Jan '24

tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: ddef9a7fc99eaf6e3fdd9800687c2aa34d9a37e9 commit: 1cdab7738ac98414f73d5d56f7d643e4398b9bf2 [26782/30000] UNIC: Supports query, configuration, and management of IP entry config: arm64-defconfig (https://download.01.org/0day-ci/archive/20240123/202401231038.k8yrs6Qq-lkp@…) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240123/202401231038.k8yrs6Qq-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202401231038.k8yrs6Qq-lkp@intel.com/ All warnings (new ones prefixed by >>): drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c: In function 'hclge_mbx_get_vf_flr_status_handler': >> drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c:1030:27: warning: unused variable 'hdev' [-Wunused-variable] 1030 | struct hclge_dev *hdev = param->vport->back; | ^~~~ drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c: In function 'hclge_mbx_vf_uninit_handler': drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c:1046:27: warning: unused variable 'hdev' [-Wunused-variable] 1046 | struct hclge_dev *hdev = param->vport->back; | ^~~~ vim +/hdev +1030 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c 1026 1027 static int 1028 hclge_mbx_get_vf_flr_status_handler(struct hclge_mbx_ops_param *param) 1029 { > 1030 struct hclge_dev *hdev = param->vport->back; 1031 1032 hclge_rm_vport_all_mac_table(param->vport, false, 1033 HCLGE_MAC_ADDR_UC); 1034 hclge_rm_vport_all_mac_table(param->vport, false, 1035 HCLGE_MAC_ADDR_MC); 1036 hclge_rm_vport_all_vlan_table(param->vport, false); 1037 #ifdef CONFIG_HNS3_UBL 1038 if (hnae3_dev_ubl_supported(hdev->ae_dev)) 1039 hclge_unic_rm_vport_all_ip_table(param->vport, false); 1040 #endif 1041 return 0; 1042 } 1043 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[openeuler:openEuler-1.0-LTS 15329/21565] drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c:66:19: warning: array subscript 0 is outside array bounds of 'struct aperture[0]'
by kernel test robot 23 Jan '24

23 Jan '24

Hi shiyongbang, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: fb3a7131883be36037affebc26a6597087cbd012 commit: 97663f80b4826fcd792deef824b18510e139d674 [15329/21565] gpu: hibmc: Fix stuck when switch GUI to text. config: arm64-randconfig-001-20240112 (https://download.01.org/0day-ci/archive/20240123/202401230904.waKHfYdD-lkp@…) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240123/202401230904.waKHfYdD-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202401230904.waKHfYdD-lkp@intel.com/ All warnings (new ones prefixed by >>): drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c:40:13: warning: no previous prototype for 'hibmc_drm_interrupt' [-Wmissing-prototypes] 40 | irqreturn_t hibmc_drm_interrupt(int irq, void *arg) | ^~~~~~~~~~~~~~~~~~~ In function 'hibmc_remove_framebuffers', inlined from 'hibmc_pci_probe' at drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c:386:2: >> drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c:66:19: warning: array subscript 0 is outside array bounds of 'struct aperture[0]' [-Warray-bounds=] 66 | ap->ranges[0].base = pci_resource_start(pdev, 0); | ~~~~~~~~~~^~~ In file included from include/drm/drm_crtc.h:31, from include/drm/drm_atomic_helper.h:31, from drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c:22: include/linux/fb.h: In function 'hibmc_pci_probe': include/linux/fb.h:527:19: note: while referencing 'ranges' 527 | } ranges[0]; | ^~~~~~ In function 'hibmc_remove_framebuffers', inlined from 'hibmc_pci_probe' at drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c:386:2: drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c:67:19: warning: array subscript 0 is outside array bounds of 'struct aperture[0]' [-Warray-bounds=] 67 | ap->ranges[0].size = pci_resource_len(pdev, 0); | ~~~~~~~~~~^~~ include/linux/fb.h: In function 'hibmc_pci_probe': include/linux/fb.h:527:19: note: while referencing 'ranges' 527 | } ranges[0]; | ^~~~~~ vim +66 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c 57 58 static void hibmc_remove_framebuffers(struct pci_dev *pdev) 59 { 60 struct apertures_struct *ap; 61 62 ap = alloc_apertures(1); 63 if (!ap) 64 return; 65 > 66 ap->ranges[0].base = pci_resource_start(pdev, 0); 67 ap->ranges[0].size = pci_resource_len(pdev, 0); 68 69 drm_fb_helper_remove_conflicting_framebuffers(ap, "hibmcdrmfb", false); 70 71 kfree(ap); 72 } 73 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[openeuler:openEuler-1.0-LTS 12457/21565] drivers/char/svm.c:1762:36: warning: 'svm_acpi_match' defined but not used
by kernel test robot 23 Jan '24

23 Jan '24

Hi Lijun, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: fb3a7131883be36037affebc26a6597087cbd012 commit: d8e64215b6c932fd8d7c521d6cb3bcf6414d300c [12457/21565] svm: Delete ifdef CONFIG_ACPI in svm config: arm64-randconfig-001-20240112 (https://download.01.org/0day-ci/archive/20240123/202401230321.uVO9BE4k-lkp@…) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240123/202401230321.uVO9BE4k-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202401230321.uVO9BE4k-lkp@intel.com/ All warnings (new ones prefixed by >>): drivers/char/svm.c:158:6: warning: no previous prototype for 'sysrq_sched_debug_show_export' [-Wmissing-prototypes] 158 | void sysrq_sched_debug_show_export(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/char/svm.c:1132:5: warning: no previous prototype for 'svm_get_pasid' [-Wmissing-prototypes] 1132 | int svm_get_pasid(pid_t vpid, int dev_id __maybe_unused) | ^~~~~~~~~~~~~ >> drivers/char/svm.c:1762:36: warning: 'svm_acpi_match' defined but not used [-Wunused-const-variable=] 1762 | static const struct acpi_device_id svm_acpi_match[] = { | ^~~~~~~~~~~~~~ In file included from arch/arm64/include/asm/atomic.h:34, from include/linux/atomic.h:7, from include/asm-generic/bitops/atomic.h:5, from arch/arm64/include/asm/bitops.h:37, from include/linux/bitops.h:19, from include/linux/kernel.h:11, from include/asm-generic/bug.h:18, from arch/arm64/include/asm/bug.h:37, from arch/arm64/include/asm/memory.h:27, from arch/arm64/include/asm/esr.h:21, from drivers/char/svm.c:10: In function '__cmpxchg_case_mb_4', inlined from '__cmpxchg_mb' at arch/arm64/include/asm/cmpxchg.h:143:1, inlined from 'svm_proc_load_flag' at drivers/char/svm.c:1465:12: arch/arm64/include/asm/atomic_lse.h:458:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'atomic_t[1]' [-Warray-bounds=] 458 | asm volatile(ARM64_LSE_ATOMIC_INSN( \ | ^~~ arch/arm64/include/asm/atomic_lse.h:487:1: note: in expansion of macro '__CMPXCHG_CASE' 487 | __CMPXCHG_CASE(w, , mb_4, al, "memory") | ^~~~~~~~~~~~~~ drivers/char/svm.c: In function 'svm_proc_load_flag': drivers/char/svm.c:1456:25: note: object 'l2buf_load_flag' of size 4 1456 | static atomic_t l2buf_load_flag = ATOMIC_INIT(0); | ^~~~~~~~~~~~~~~ In function '__cmpxchg_case_mb_4', inlined from '__cmpxchg_mb' at arch/arm64/include/asm/cmpxchg.h:143:1, inlined from 'svm_proc_load_flag' at drivers/char/svm.c:1465:12: arch/arm64/include/asm/atomic_lse.h:458:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'atomic_t[1]' [-Warray-bounds=] 458 | asm volatile(ARM64_LSE_ATOMIC_INSN( \ | ^~~ arch/arm64/include/asm/atomic_lse.h:487:1: note: in expansion of macro '__CMPXCHG_CASE' 487 | __CMPXCHG_CASE(w, , mb_4, al, "memory") | ^~~~~~~~~~~~~~ drivers/char/svm.c: In function 'svm_proc_load_flag': drivers/char/svm.c:1456:25: note: object 'l2buf_load_flag' of size 4 1456 | static atomic_t l2buf_load_flag = ATOMIC_INIT(0); | ^~~~~~~~~~~~~~~ vim +/svm_acpi_match +1762 drivers/char/svm.c 8f29578be61750 Jiankang Chen 2019-10-28 1761 8f29578be61750 Jiankang Chen 2019-10-28 @1762 static const struct acpi_device_id svm_acpi_match[] = { 8f29578be61750 Jiankang Chen 2019-10-28 1763 { "HSVM1980", 0}, 8f29578be61750 Jiankang Chen 2019-10-28 1764 { } 8f29578be61750 Jiankang Chen 2019-10-28 1765 }; 8f29578be61750 Jiankang Chen 2019-10-28 1766 MODULE_DEVICE_TABLE(acpi, svm_acpi_match); d8e64215b6c932 Lijun Fang 2020-01-16 1767 :::::: The code at line 1762 was first introduced by commit :::::: 8f29578be61750d83b8effb090c25e07432dcb75 svm: add svm drv framework for hi1910 and hi1980 :::::: TO: Jiankang Chen <chenjiankang1(a)huawei.com> :::::: CC: Xie XiuQi <xiexiuqi(a)huawei.com> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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