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author | Matthew Wilcox <willy@infradead.org> | 2019-01-03 15:26:41 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-01-04 13:13:46 -0800 |
commit | 3fc2579e6f162fcff964f5aa01c8a29438ca5c05 (patch) | |
tree | a90c733a19c07e111d9195181d1f3a37e92ef0eb /arch/s390 | |
parent | e6310f0fb5cd3f65244dbdef2fb264859891c7ec (diff) | |
download | linux-3fc2579e6f162fcff964f5aa01c8a29438ca5c05.tar.gz |
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/s390')
-rw-r--r-- | arch/s390/include/asm/bitops.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h index 86e5b2fdee3c..d1f8a4d94cca 100644 --- a/arch/s390/include/asm/bitops.h +++ b/arch/s390/include/asm/bitops.h @@ -397,9 +397,9 @@ static inline int fls64(unsigned long word) * This is defined the same way as ffs. * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. */ -static inline int fls(int word) +static inline int fls(unsigned int word) { - return fls64((unsigned int)word); + return fls64(word); } #else /* CONFIG_HAVE_MARCH_Z9_109_FEATURES */ |