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SubjectRe: [PATCH v13 1/6] x86/boot: Introduce kstrtoull() to boot directory instead of simple_strtoull()
On Mon, Dec 17, 2018 at 03:22:39AM +0800, kbuild test robot wrote:
> Hi Chao,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v4.20-rc6 next-20181214]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url: https://github.com/0day-ci/linux/commits/Chao-Fan/x86-boot-KASLR-Parse-ACPI-table-and-limit-KASLR-to-choosing-immovable-memory/20181214-082218
> config: i386-allmodconfig (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> reproduce:
> # save the attached .config to linux build tree
> make ARCH=i386
>
> All error/warnings (new ones prefixed by >>):
>
> In file included from include/linux/kernel.h:207:0,
> from arch/x86/boot/string.c:17:
> >> arch/x86/include/asm/div64.h:61:21: error: redefinition of 'div_u64_rem'

Thanks for the report. We need something like this I guess:

---
diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c
index 771971efc0d6..4a823481e4e1 100644
--- a/arch/x86/boot/string.c
+++ b/arch/x86/boot/string.c
@@ -191,7 +191,7 @@ char *strchr(const char *s, int c)
return (char *)s;
}

-static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
+static inline u64 __div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
union {
u64 v64;
@@ -213,7 +213,7 @@ static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
static inline u64 div_u64(u64 dividend, u32 divisor)
{
u32 remainder;
- return div_u64_rem(dividend, divisor, &remainder);
+ return __div_u64_rem(dividend, divisor, &remainder);
}

static inline char _tolower(const char c)
--
Regards/Gruss,
Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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