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uaccess: add generic fallback version of copy_mc_to_user() 

ANBZ: #6424

cherry-picked from https://lore.kernel.org/lkml/20230508014436.198717-1-tongtiangen@huawei.com/.

x86/powerpc has it's implementation of copy_mc_to_user(), we add generic
fallback in include/linux/uaccess.h prepare for other architechures to
enable CONFIG_ARCH_HAS_COPY_MC.

Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Ruidong Tian <tianruidong@linux.alibaba.com>
Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/2131
This commit is contained in:
Tong Tiangen 2023-05-08 09:44:32 +08:00 committed by 小龙
parent 1100488ba9
commit 6ff9eb0eec
3 changed files with 11 additions and 0 deletions
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1
arch/powerpc/include/asm/uaccess.h
View File

@ -388,6 +388,7 @@ copy_mc_to_user(void __user *to, const void *from, unsigned long n)
return n;
}
#define copy_mc_to_user copy_mc_to_user
#endif
#ifdef __powerpc64__

1
arch/x86/include/asm/uaccess.h
View File

@ -447,6 +447,7 @@ copy_mc_to_kernel(void *to, const void *from, unsigned len);
unsigned long __must_check
copy_mc_to_user(void *to, const void *from, unsigned len);
#define copy_mc_to_user copy_mc_to_user
#endif
/*

9
include/linux/uaccess.h
View File

@ -224,6 +224,15 @@ copy_mc_to_kernel(void *dst, const void *src, size_t cnt)
}
#endif
#ifndef copy_mc_to_user
static inline unsigned long __must_check
copy_mc_to_user(void *dst, const void *src, size_t cnt)
{
check_object_size(src, cnt, true);
return raw_copy_to_user(dst, src, cnt);
}
#endif
static __always_inline void pagefault_disabled_inc(void)
{
current->pagefault_disabled++;