From: Chuck Lever Date: Wed, 17 Oct 2007 16:04:38 +0000 (+0200) Subject: x86: Eliminate result signage problem in asm-x86_64/bitops.h X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d2ccc3fdde1a860b970109ad78865b7e44d3fc0c;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git x86: Eliminate result signage problem in asm-x86_64/bitops.h The return type of __scanbit() doesn't match the return type of find_{first,next}_bit(). Thus when you construct something like this: boolean ? __scanbit() : find_first_bit() you get an unsigned long result if "boolean" is true, and a signed long result if "boolean" is false. In file included from /home/cel/src/linux/include/linux/mmzone.h:15, from /home/cel/src/linux/include/linux/gfp.h:4, from /home/cel/src/linux/include/linux/slab.h:14, from /home/cel/src/linux/include/linux/percpu.h:5, from /home/cel/src/linux/include/linux/rcupdate.h:41, from /home/cel/src/linux/include/linux/dcache.h:10, from /home/cel/src/linux/include/linux/fs.h:275, from /home/cel/src/linux/fs/nfs/sysctl.c:9: /home/cel/src/linux/include/linux/nodemask.h: In function ‘__first_node’: /home/cel/src/linux/include/linux/nodemask.h:229: warning: signed and unsigned type in conditional expression /home/cel/src/linux/include/linux/nodemask.h: In function ‘__next_node’: /home/cel/src/linux/include/linux/nodemask.h:235: warning: signed and unsigned type in conditional expression /home/cel/src/linux/include/linux/nodemask.h: In function ‘__first_unset_node’: /home/cel/src/linux/include/linux/nodemask.h:253: warning: signed and unsigned type in conditional expression [ tglx: arch/x86 adaptation ] Signed-off-by: Chuck Lever Signed-off-by: Andi Kleen Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- diff --git a/include/asm-x86/bitops_64.h b/include/asm-x86/bitops_64.h index d4dbbe5f7bd9..1d7d9b4bcacb 100644 --- a/include/asm-x86/bitops_64.h +++ b/include/asm-x86/bitops_64.h @@ -260,7 +260,7 @@ extern long find_first_bit(const unsigned long * addr, unsigned long size); extern long find_next_bit(const unsigned long * addr, long size, long offset); /* return index of first bet set in val or max when no bit is set */ -static inline unsigned long __scanbit(unsigned long val, unsigned long max) +static inline long __scanbit(unsigned long val, unsigned long max) { asm("bsfq %1,%0 ; cmovz %2,%0" : "=&r" (val) : "r" (val), "r" (max)); return val;