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fls: change parameter to unsigned int

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When testing in userspace, UBSAN pointed out that shifting into the sign
bit is undefined behaviour.  It doesn't really make sense to ask for the
highest set bit of a negative value, so just turn the argument type into
an unsigned int.

Some architectures (eg ppc) already had it declared as an unsigned int,
so I don't expect too many problems.

Link: http://lkml.kernel.org/r/20181105221117.31828-1-willy@infradead.org
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox
2019-01-03 15:26:41 -08:00
committed by Linus Torvalds
parent e6310f0fb5
commit 3fc2579e6f
16 changed files with 19 additions and 20 deletions
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4
arch/arc/include/asm/bitops.h
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@@ -278,7 +278,7 @@ static inline __attribute__ ((const)) int clz(unsigned int x)
return res;
}
static inline int constant_fls(int x)
static inline int constant_fls(unsigned int x)
{
int r = 32;
@@ -312,7 +312,7 @@ static inline int constant_fls(int x)
* @result: [1-32]
* fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0
*/
static inline __attribute__ ((const)) int fls(unsigned long x)
static inline __attribute__ ((const)) int fls(unsigned int x)
{
if (__builtin_constant_p(x))
return constant_fls(x);