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3fc2579e6f
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>
33 lines
648 B
C
33 lines
648 B
C
/*
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* OpenRISC Linux
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*
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __ASM_OPENRISC_FLS_H
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#define __ASM_OPENRISC_FLS_H
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#ifdef CONFIG_OPENRISC_HAVE_INST_FL1
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static inline int fls(unsigned int x)
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{
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int ret;
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__asm__ ("l.fl1 %0,%1"
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: "=r" (ret)
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: "r" (x));
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return ret;
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}
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#else
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#include <asm-generic/bitops/fls.h>
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#endif
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#endif /* __ASM_OPENRISC_FLS_H */
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