diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-05 05:23:13 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-05 05:23:13 +0300 |
| commit | d09a8e6f2c0a4fe3dcb85d21ea1069aa83152fe1 (patch) | |
| tree | f1674b8373a4a47e20a5ca576b12ccbe6afe535d /include | |
| parent | 831638568702f82dc291ad92bb0e5a4afdcc81be (diff) | |
| parent | 8780356ef630aa577fd4daa49e49b79674711fae (diff) | |
| download | linux-d09a8e6f2c0a4fe3dcb85d21ea1069aa83152fe1.tar.xz | |
Merge branch 'x86-dax-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 dax updates from Ingo Molnar:
"This contains x86 memcpy_mcsafe() fault handling improvements the
nvdimm tree would like to make more use of"
* 'x86-dax-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/asm/memcpy_mcsafe: Define copy_to_iter_mcsafe()
x86/asm/memcpy_mcsafe: Add write-protection-fault handling
x86/asm/memcpy_mcsafe: Return bytes remaining
x86/asm/memcpy_mcsafe: Add labels for __memcpy_mcsafe() write fault handling
x86/asm/memcpy_mcsafe: Remove loop unrolling
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/string.h | 4 | ||||
| -rw-r--r-- | include/linux/uio.h | 15 |
2 files changed, 17 insertions, 2 deletions
diff --git a/include/linux/string.h b/include/linux/string.h index dd39a690c841..4a5a0eb7df51 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -147,8 +147,8 @@ extern int memcmp(const void *,const void *,__kernel_size_t); extern void * memchr(const void *,int,__kernel_size_t); #endif #ifndef __HAVE_ARCH_MEMCPY_MCSAFE -static inline __must_check int memcpy_mcsafe(void *dst, const void *src, - size_t cnt) +static inline __must_check unsigned long memcpy_mcsafe(void *dst, + const void *src, size_t cnt) { memcpy(dst, src, cnt); return 0; diff --git a/include/linux/uio.h b/include/linux/uio.h index e67e12adb136..f5766e853a77 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -154,6 +154,12 @@ size_t _copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i); #define _copy_from_iter_flushcache _copy_from_iter_nocache #endif +#ifdef CONFIG_ARCH_HAS_UACCESS_MCSAFE +size_t _copy_to_iter_mcsafe(void *addr, size_t bytes, struct iov_iter *i); +#else +#define _copy_to_iter_mcsafe _copy_to_iter +#endif + static __always_inline __must_check size_t copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i) { @@ -163,6 +169,15 @@ size_t copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i) return _copy_from_iter_flushcache(addr, bytes, i); } +static __always_inline __must_check +size_t copy_to_iter_mcsafe(void *addr, size_t bytes, struct iov_iter *i) +{ + if (unlikely(!check_copy_size(addr, bytes, false))) + return 0; + else + return _copy_to_iter_mcsafe(addr, bytes, i); +} + size_t iov_iter_zero(size_t bytes, struct iov_iter *); unsigned long iov_iter_alignment(const struct iov_iter *i); unsigned long iov_iter_gap_alignment(const struct iov_iter *i); |