The patch titled
Subject: cpumask: don't calculate length of the input string
has been added to the -mm tree. Its filename is
cpumask-dont-calculate-length-of-the-input-string.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/cpumask-dont-calculate-length-of-the-input-string.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/cpumask-dont-calculate-length-of-the-input-string.patch
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------------------------------------------------------
From: Yury Norov <yury.norov@xxxxxxxxx>
Subject: cpumask: don't calculate length of the input string
New design of inner bitmap_parse() allows to avoid
calculating the size of a null-terminated string.
Link: http://lkml.kernel.org/r/20190501010636.30595-8-ynorov@xxxxxxxxxxx
Signed-off-by: Yury Norov <ynorov@xxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Amritha Nambiar <amritha.nambiar@xxxxxxxxx>
Cc: Willem de Bruijn <willemb@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: "Tobin C . Harding" <tobin@xxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/cpumask.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/include/linux/cpumask.h~cpumask-dont-calculate-length-of-the-input-string
+++ a/include/linux/cpumask.h
@@ -633,9 +633,7 @@ static inline int cpumask_parselist_user
*/
static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
{
- unsigned int len = strchrnul(buf, '\n') - buf;
-
- return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
+ return bitmap_parse(buf, UINT_MAX, cpumask_bits(dstp), nr_cpumask_bits);
}
/**
_
Patches currently in -mm which might be from yury.norov@xxxxxxxxx are
mm-slub-avoid-double-string-traverse-in-kmem_cache_flags.patch
lib-string-add-strnchrnul.patch
bitops-more-bits_to_-macros.patch
lib-add-test-for-bitmap_parse.patch
lib-make-bitmap_parse_user-a-wrapper-on-bitmap_parse.patch
lib-rework-bitmap_parse.patch
lib-new-testcases-for-bitmap_parse_user.patch
cpumask-dont-calculate-length-of-the-input-string.patch
