A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-30 19:51:31 -04:00
Code Issues Projects Releases Packages Wiki Activity

lib/string.c: introduce memchr_inv()

Browse source 
memchr_inv() is mainly used to check whether the whole buffer is filled
with just a specified byte.

The function name and prototype are stolen from logfs and the
implementation is from SLUB.

Signed-off-by: Akinobu Mita <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Acked-by: Pekka Enberg <[email protected]>
Cc: Matt Mackall <[email protected]>
Acked-by: Joern Engel <[email protected]>
Cc: Marcin Slusarz <[email protected]>
Cc: Eric Dumazet <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Akinobu Mita 2011-10-31 17:08:07 -07:00 • committed by Linus Torvalds
commit 798248206b
5 changed files with 57 additions and 68 deletions
Download patch file Download diff file Expand all files Collapse all files

47
mm/slub.c
View file

@ -655,49 +655,6 @@ static void init_object(struct kmem_cache *s, void *object, u8 val)
memset(p + s->objsize, val, s->inuse - s->objsize);
}
static u8 *check_bytes8(u8 *start, u8 value, unsigned int bytes)
{
while (bytes) {
if (*start != value)
return start;
start++;
bytes--;
}
return NULL;
}
static u8 *check_bytes(u8 *start, u8 value, unsigned int bytes)
{
u64 value64;
unsigned int words, prefix;
if (bytes <= 16)
return check_bytes8(start, value, bytes);
value64 = value | value << 8 | value << 16 | value << 24;
value64 = (value64 & 0xffffffff) | value64 << 32;
prefix = 8 - ((unsigned long)start) % 8;
if (prefix) {
u8 *r = check_bytes8(start, value, prefix);
if (r)
return r;
start += prefix;
bytes -= prefix;
}
words = bytes / 8;
while (words) {
if (*(u64 *)start != value64)
return check_bytes8(start, value, 8);
start += 8;
words--;
}
return check_bytes8(start, value, bytes % 8);
}
static void restore_bytes(struct kmem_cache *s, char *message, u8 data,
void *from, void *to)
{
@ -712,7 +669,7 @@ static int check_bytes_and_report(struct kmem_cache *s, struct page *page,
u8 *fault;
u8 *end;
fault = check_bytes(start, value, bytes);
fault = memchr_inv(start, value, bytes);
if (!fault)
return 1;
@ -805,7 +762,7 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
if (!remainder)
return 1;
fault = check_bytes(end - remainder, POISON_INUSE, remainder);
fault = memchr_inv(end - remainder, POISON_INUSE, remainder);
if (!fault)
return 1;
while (end > fault && end[-1] == POISON_INUSE)