From: Nathan Chancellor natechancellor@gmail.com
stable inclusion from stable-v5.10.116 commit 7648f42d1a6241111078cd3f237086f998e63027 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L64K
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit d422c6c0644bccbb1ebeefffa51f35cec3019517 upstream.
When building xway_defconfig with clang:
arch/mips/lantiq/prom.c:82:23: error: array comparison always evaluates to true [-Werror,-Wtautological-compare] else if (__dtb_start != __dtb_end) ^ 1 error generated.
These are not true arrays, they are linker defined symbols, which are just addresses. Using the address of operator silences the warning and does not change the resulting assembly with either clang/ld.lld or gcc/ld (tested with diff + objdump -Dr). Do the same thing across the entire MIPS subsystem to ensure there are no more warnings around this type of comparison.
Link: https://github.com/ClangBuiltLinux/linux/issues/1232 Signed-off-by: Nathan Chancellor natechancellor@gmail.com Acked-by: Florian Fainelli f.fainelli@gmail.com Signed-off-by: Thomas Bogendoerfer tsbogend@alpha.franken.de Cc: Sudip Mukherjee sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Wei Li liwei391@huawei.com --- arch/mips/bmips/setup.c | 2 +- arch/mips/lantiq/prom.c | 2 +- arch/mips/pic32/pic32mzda/init.c | 2 +- arch/mips/ralink/of.c | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/mips/bmips/setup.c b/arch/mips/bmips/setup.c index 19308df5f577..1b06b25aea87 100644 --- a/arch/mips/bmips/setup.c +++ b/arch/mips/bmips/setup.c @@ -167,7 +167,7 @@ void __init plat_mem_setup(void) dtb = phys_to_virt(fw_arg2); else if (fw_passed_dtb) /* UHI interface or appended dtb */ dtb = (void *)fw_passed_dtb; - else if (__dtb_start != __dtb_end) + else if (&__dtb_start != &__dtb_end) dtb = (void *)__dtb_start; else panic("no dtb found"); diff --git a/arch/mips/lantiq/prom.c b/arch/mips/lantiq/prom.c index 51a218f04fe0..3f568f5aae2d 100644 --- a/arch/mips/lantiq/prom.c +++ b/arch/mips/lantiq/prom.c @@ -79,7 +79,7 @@ void __init plat_mem_setup(void)
if (fw_passed_dtb) /* UHI interface */ dtb = (void *)fw_passed_dtb; - else if (__dtb_start != __dtb_end) + else if (&__dtb_start != &__dtb_end) dtb = (void *)__dtb_start; else panic("no dtb found"); diff --git a/arch/mips/pic32/pic32mzda/init.c b/arch/mips/pic32/pic32mzda/init.c index 50f376f058f4..f232c77ff526 100644 --- a/arch/mips/pic32/pic32mzda/init.c +++ b/arch/mips/pic32/pic32mzda/init.c @@ -28,7 +28,7 @@ static ulong get_fdtaddr(void) if (fw_passed_dtb && !fw_arg2 && !fw_arg3) return (ulong)fw_passed_dtb;
- if (__dtb_start < __dtb_end) + if (&__dtb_start < &__dtb_end) ftaddr = (ulong)__dtb_start;
return ftaddr; diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c index a971f1aca096..3017263ac4f9 100644 --- a/arch/mips/ralink/of.c +++ b/arch/mips/ralink/of.c @@ -77,7 +77,7 @@ void __init plat_mem_setup(void) */ if (fw_passed_dtb) dtb = (void *)fw_passed_dtb; - else if (__dtb_start != __dtb_end) + else if (&__dtb_start != &__dtb_end) dtb = (void *)__dtb_start;
__dt_setup_arch(dtb);