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| author | Matthew Wilcox <willy@infradead.org> | 2019-01-03 15:26:41 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-01-04 13:13:46 -0800 |
| commit | 3fc2579e6f162fcff964f5aa01c8a29438ca5c05 (patch) | |
| tree | a90c733a19c07e111d9195181d1f3a37e92ef0eb /arch/ia64 | |
| parent | e6310f0fb5cd3f65244dbdef2fb264859891c7ec (diff) | |
| download | linux-stable-3fc2579e6f162fcff964f5aa01c8a29438ca5c05.tar.gz linux-stable-3fc2579e6f162fcff964f5aa01c8a29438ca5c05.tar.bz2 linux-stable-3fc2579e6f162fcff964f5aa01c8a29438ca5c05.zip | |
fls: change parameter to unsigned int
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>
Diffstat (limited to 'arch/ia64')
| -rw-r--r-- | arch/ia64/include/asm/bitops.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/ia64/include/asm/bitops.h b/arch/ia64/include/asm/bitops.h index 56a774bf13fa..2f24ee6459d2 100644 --- a/arch/ia64/include/asm/bitops.h +++ b/arch/ia64/include/asm/bitops.h @@ -388,8 +388,7 @@ ia64_fls (unsigned long x) * Find the last (most significant) bit set. Returns 0 for x==0 and * bits are numbered from 1..32 (e.g., fls(9) == 4). */ -static inline int -fls (int t) +static inline int fls(unsigned int t) { unsigned long x = t & 0xffffffffu; |