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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/openrisc | |
| parent | e6310f0fb5cd3f65244dbdef2fb264859891c7ec (diff) | |
| download | linux-0-day-3fc2579e6f162fcff964f5aa01c8a29438ca5c05.tar.gz linux-0-day-3fc2579e6f162fcff964f5aa01c8a29438ca5c05.tar.xz | |
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/openrisc')
| -rw-r--r-- | arch/openrisc/include/asm/bitops/fls.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/openrisc/include/asm/bitops/fls.h b/arch/openrisc/include/asm/bitops/fls.h index 9efbf9ad86c40..57de5a1115bfd 100644 --- a/arch/openrisc/include/asm/bitops/fls.h +++ b/arch/openrisc/include/asm/bitops/fls.h @@ -15,7 +15,7 @@ #ifdef CONFIG_OPENRISC_HAVE_INST_FL1 -static inline int fls(int x) +static inline int fls(unsigned int x) { int ret; |