diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-12-17 10:05:19 -0800 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2016-08-27 11:23:38 +0800 |
| commit | ea2e77f49015ae941d7c98fbe066d387dec8fa55 (patch) | |
| tree | f4c0c4a4d22786046ad2e3e322cddb70d2364fa3 /lib/strnlen_user.c | |
| parent | 798522d907ede95418a20e7153101b4659151e32 (diff) | |
Use the new batched user accesses in generic user string handling
This converts the generic user string functions to use the batched user
access functions.
It makes a big difference on Skylake, which is the first x86
microarchitecture to implement SMAP. The STAC/CLAC instructions are not
very fast, and doing them for each access inside the loop that copies
strings from user space (which is what the pathname handling does for
every pathname the kernel uses, for example) is very inefficient.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 9fd4470ff4974c41b1db43c3b355b9085af9c12a)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'lib/strnlen_user.c')
| -rw-r--r-- | lib/strnlen_user.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c index 3a5f2b366d84..2625943625d7 100644 --- a/lib/strnlen_user.c +++ b/lib/strnlen_user.c @@ -45,7 +45,7 @@ static inline long do_strnlen_user(const char __user *src, unsigned long count, src -= align; max += align; - if (unlikely(__get_user(c,(unsigned long __user *)src))) + if (unlikely(unsafe_get_user(c,(unsigned long __user *)src))) return 0; c |= aligned_byte_mask(align); @@ -61,7 +61,7 @@ static inline long do_strnlen_user(const char __user *src, unsigned long count, if (unlikely(max <= sizeof(unsigned long))) break; max -= sizeof(unsigned long); - if (unlikely(__get_user(c,(unsigned long __user *)(src+res)))) + if (unlikely(unsafe_get_user(c,(unsigned long __user *)(src+res)))) return 0; } res -= align; @@ -112,7 +112,12 @@ long strnlen_user(const char __user *str, long count) src_addr = (unsigned long)str; if (likely(src_addr < max_addr)) { unsigned long max = max_addr - src_addr; - return do_strnlen_user(str, count, max); + long retval; + + user_access_begin(); + retval = do_strnlen_user(str, count, max); + user_access_end(); + return retval; } return 0; } @@ -141,7 +146,12 @@ long strlen_user(const char __user *str) src_addr = (unsigned long)str; if (likely(src_addr < max_addr)) { unsigned long max = max_addr - src_addr; - return do_strnlen_user(str, ~0ul, max); + long retval; + + user_access_begin(); + retval = do_strnlen_user(str, ~0ul, max); + user_access_end(); + return retval; } return 0; } |