| Message ID | 20240413022843.1730174-1-zouyipeng@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3] arm: fix clang build warning in include/asm/memory.h | expand |
On Sat, Apr 13, 2024 at 4:29 AM Yipeng Zou <zouyipeng@huawei.com> wrote: > There is a build error has been founded with build in clang-15.0.4: > > ./arch/arm/include/asm/memory.h:358:12: error: result of comparison "phys addr_t’ (aka 'unsigned int’) > 4294967295 is always false [-Werror, -Wtautological-type-limit-compare] > if (addr > (u32)~0) > ~~~~ ^ ~~~~~~~ > > It will be always goes fail without CONFIG_PHYS_ADDR_T_64BIT. > > Directly silence it by Use CONFIG_PHYS_ADDR_T_64BIT. > > Fixes: 981b6714dbd2 ("ARM: provide improved virt_to_idmap() functionality") > Signed-off-by: Yipeng Zou <zouyipeng@huawei.com> > Reviewed-by: Nathan Chancellor <nathan@kernel.org> Excellent, thanks! Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Please put this patch into Russell's patch tracker. Yours, Linus Walleij
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index ef2aa79ece5a..a7973eb8cbc7 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -19,6 +19,7 @@ #include <linux/const.h> #include <linux/types.h> #include <linux/sizes.h> +#include <linux/limits.h> #ifdef CONFIG_NEED_MACH_MEMORY_H #include <mach/memory.h> @@ -353,8 +354,10 @@ static inline unsigned long phys_to_idmap(phys_addr_t addr) { if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { addr += arch_phys_to_idmap_offset; - if (addr > (u32)~0) +#ifdef CONFIG_PHYS_ADDR_T_64BIT + if (addr > U32_MAX) addr = IDMAP_INVALID_ADDR; +#endif } return addr; }
There is a build error has been founded with build in clang-15.0.4: ./arch/arm/include/asm/memory.h:358:12: error: result of comparison "phys addr_t’ (aka 'unsigned int’) > 4294967295 is always false [-Werror, -Wtautological-type-limit-compare] if (addr > (u32)~0) ~~~~ ^ ~~~~~~~ It will be always goes fail without CONFIG_PHYS_ADDR_T_64BIT. Directly silence it by Use CONFIG_PHYS_ADDR_T_64BIT. Fixes: 981b6714dbd2 ("ARM: provide improved virt_to_idmap() functionality") Signed-off-by: Yipeng Zou <zouyipeng@huawei.com> Reviewed-by: Nathan Chancellor <nathan@kernel.org> --- arch/arm/include/asm/memory.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)