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tools: sync find_next_bit implementation 

Sync the implementation with recent kernel changes.

Link: https://lkml.kernel.org/r/20210401003153.97325-9-yury.norov@gmail.com
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Alexey Klimov <aklimov@redhat.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Sterba <dsterba@suse.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jianpeng Ma <jianpeng.ma@intel.com>
Cc: Joe Perches <joe@perches.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Rich Felker <dalias@libc.org>
Cc: Stefano Brivio <sbrivio@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: Yoshinori Sato <ysato@users.osdn.me>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yury Norov 2021-05-06 18:03:07 -07:00 committed by Linus Torvalds
parent 5c88af59f9
commit ea81c1ef44
2 changed files with 42 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
tools/include/asm-generic/bitops/find.h
View File

@ -2,6 +2,10 @@
#ifndef _TOOLS_LINUX_ASM_GENERIC_BITOPS_FIND_H_
#define _TOOLS_LINUX_ASM_GENERIC_BITOPS_FIND_H_
extern unsigned long _find_next_bit(const unsigned long *addr1,
const unsigned long *addr2, unsigned long nbits,
unsigned long start, unsigned long invert, unsigned long le);
#ifndef find_next_bit
/**
* find_next_bit - find the next set bit in a memory region
@ -12,8 +16,12 @@
* Returns the bit number for the next set bit
* If no bits are set, returns @size.
*/
extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
size, unsigned long offset);
static inline
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
unsigned long offset)
{
return _find_next_bit(addr, NULL, size, offset, 0UL, 0);
}
#endif
#ifndef find_next_and_bit
@ -27,13 +35,16 @@ extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
* Returns the bit number for the next set bit
* If no bits are set, returns @size.
*/
extern unsigned long find_next_and_bit(const unsigned long *addr1,
static inline
unsigned long find_next_and_bit(const unsigned long *addr1,
const unsigned long *addr2, unsigned long size,
unsigned long offset);
unsigned long offset)
{
return _find_next_bit(addr1, addr2, size, offset, 0UL, 0);
}
#endif
#ifndef find_next_zero_bit
/**
* find_next_zero_bit - find the next cleared bit in a memory region
* @addr: The address to base the search on
@ -43,8 +54,12 @@ extern unsigned long find_next_and_bit(const unsigned long *addr1,
* Returns the bit number of the next zero bit
* If no bits are zero, returns @size.
*/
static inline
unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
unsigned long offset);
unsigned long offset)
{
return _find_next_bit(addr, NULL, size, offset, ~0UL, 0);
}
#endif
#ifndef find_first_bit

52
tools/lib/find_bit.c
View File

@ -28,11 +28,12 @@
* searching it for one bits.
* - The optional "addr2", which is anded with "addr1" if present.
*/
static inline unsigned long _find_next_bit(const unsigned long *addr1,
unsigned long _find_next_bit(const unsigned long *addr1,
const unsigned long *addr2, unsigned long nbits,
unsigned long start, unsigned long invert)
unsigned long start, unsigned long invert, unsigned long le)
{
unsigned long tmp;
unsigned long tmp, mask;
(void) le;
if (unlikely(start >= nbits))
return nbits;
@ -43,7 +44,19 @@ static inline unsigned long _find_next_bit(const unsigned long *addr1,
tmp ^= invert;
/* Handle 1st word. */
tmp &= BITMAP_FIRST_WORD_MASK(start);
mask = BITMAP_FIRST_WORD_MASK(start);
/*
* Due to the lack of swab() in tools, and the fact that it doesn't
* need little-endian support, just comment it out
*/
#if (0)
if (le)
mask = swab(mask);
#endif
tmp &= mask;
start = round_down(start, BITS_PER_LONG);
while (!tmp) {
@ -57,18 +70,12 @@ static inline unsigned long _find_next_bit(const unsigned long *addr1,
tmp ^= invert;
}
return min(start + __ffs(tmp), nbits);
}
#if (0)
if (le)
tmp = swab(tmp);
#endif
#ifndef find_next_bit
/*
* Find the next set bit in a memory region.
*/
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
unsigned long offset)
{
return _find_next_bit(addr, NULL, size, offset, 0UL);
return min(start + __ffs(tmp), nbits);
}
#endif
@ -105,20 +112,3 @@ unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size)
return size;
}
#endif
#ifndef find_next_zero_bit
unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
unsigned long offset)
{
return _find_next_bit(addr, NULL, size, offset, ~0UL);
}
#endif
#ifndef find_next_and_bit
unsigned long find_next_and_bit(const unsigned long *addr1,
const unsigned long *addr2, unsigned long size,
unsigned long offset)
{
return _find_next_bit(addr1, addr2, size, offset, 0UL);
}
#endif