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| author | Ingo Molnar <mingo@kernel.org> | 2018-07-25 11:47:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-07-25 11:47:02 +0200 |
| commit | 93081caaaed6a40a4f6d9b7ba3f581a4bb1d4404 (patch) | |
| tree | f574201ba58ddf9e6264f463e613066cfc8532ba /arch/x86/include/asm/uaccess_64.h | |
| parent | perf, tools: Use correct articles in comments (diff) | |
| parent | perf/core: Fix crash when using HW tracing kernel filters (diff) | |
| download | linux-93081caaaed6a40a4f6d9b7ba3f581a4bb1d4404.tar.xz linux-93081caaaed6a40a4f6d9b7ba3f581a4bb1d4404.zip | |
Merge branch 'perf/urgent' into perf/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/uaccess_64.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess_64.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h index 62acb613114b..a9d637bc301d 100644 --- a/arch/x86/include/asm/uaccess_64.h +++ b/arch/x86/include/asm/uaccess_64.h @@ -52,7 +52,12 @@ copy_to_user_mcsafe(void *to, const void *from, unsigned len) unsigned long ret; __uaccess_begin(); - ret = memcpy_mcsafe(to, from, len); + /* + * Note, __memcpy_mcsafe() is explicitly used since it can + * handle exceptions / faults. memcpy_mcsafe() may fall back to + * memcpy() which lacks this handling. + */ + ret = __memcpy_mcsafe(to, from, len); __uaccess_end(); return ret; } |