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| author | Balbir Singh <bsingharora@gmail.com> | 2019-08-20 10:13:51 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-21 14:23:48 +0200 |
| commit | 4d4a273854c9eac1a1b163830658dc825e183ad5 (patch) | |
| tree | 18b6a919f5cb50880c8b81d96bfd9f6fb881e59d /arch/powerpc/include/asm/string.h | |
| parent | powerpc/mce: Handle UE event for memcpy_mcsafe (diff) | |
| download | linux-4d4a273854c9eac1a1b163830658dc825e183ad5.tar.xz linux-4d4a273854c9eac1a1b163830658dc825e183ad5.zip | |
powerpc/memcpy: Add memcpy_mcsafe for pmem
The pmem infrastructure uses memcpy_mcsafe in the pmem layer so as to
convert machine check exceptions into a return value on failure in case
a machine check exception is encountered during the memcpy. The return
value is the number of bytes remaining to be copied.
This patch largely borrows from the copyuser_power7 logic and does not add
the VMX optimizations, largely to keep the patch simple. If needed those
optimizations can be folded in.
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
[arbab@linux.ibm.com: Added symbol export]
Co-developed-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820081352.8641-7-santosh@fossix.org
Diffstat (limited to 'arch/powerpc/include/asm/string.h')
| -rw-r--r-- | arch/powerpc/include/asm/string.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/string.h b/arch/powerpc/include/asm/string.h index 9bf6dffb4090..b72692702f35 100644 --- a/arch/powerpc/include/asm/string.h +++ b/arch/powerpc/include/asm/string.h @@ -53,7 +53,9 @@ void *__memmove(void *to, const void *from, __kernel_size_t n); #ifndef CONFIG_KASAN #define __HAVE_ARCH_MEMSET32 #define __HAVE_ARCH_MEMSET64 +#define __HAVE_ARCH_MEMCPY_MCSAFE +extern int memcpy_mcsafe(void *dst, const void *src, __kernel_size_t sz); extern void *__memset16(uint16_t *, uint16_t v, __kernel_size_t); extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t); extern void *__memset64(uint64_t *, uint64_t v, __kernel_size_t); |