forked from luck/tmp_suning_uos_patched
26333576fd
Introduce test_and_set_bit_lock / clear_bit_unlock bitops with lock semantics. Convert all architectures to use the generic implementation. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-By: David Howells <dhowells@redhat.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Bryan Wu <bryan.wu@analog.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Greg Ungerer <gerg@uclinux.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Matthew Wilcox <willy@debian.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Andi Kleen <ak@muc.de> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
|
|
* include/asm-xtensa/bitops.h
|
|
*
|
|
* Atomic operations that C can't guarantee us.Useful for resource counting etc.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2001 - 2007 Tensilica Inc.
|
|
*/
|
|
|
|
#ifndef _XTENSA_BITOPS_H
|
|
#define _XTENSA_BITOPS_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/byteorder.h>
|
|
#include <asm/system.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
# error SMP not supported on this architecture
|
|
#endif
|
|
|
|
#define smp_mb__before_clear_bit() barrier()
|
|
#define smp_mb__after_clear_bit() barrier()
|
|
|
|
#include <asm-generic/bitops/atomic.h>
|
|
#include <asm-generic/bitops/non-atomic.h>
|
|
|
|
#if XCHAL_HAVE_NSA
|
|
|
|
static inline unsigned long __cntlz (unsigned long x)
|
|
{
|
|
int lz;
|
|
asm ("nsau %0, %1" : "=r" (lz) : "r" (x));
|
|
return lz;
|
|
}
|
|
|
|
/*
|
|
* ffz: Find first zero in word. Undefined if no zero exists.
|
|
* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
|
|
*/
|
|
|
|
static inline int ffz(unsigned long x)
|
|
{
|
|
return 31 - __cntlz(~x & -~x);
|
|
}
|
|
|
|
/*
|
|
* __ffs: Find first bit set in word. Return 0 for bit 0
|
|
*/
|
|
|
|
static inline int __ffs(unsigned long x)
|
|
{
|
|
return 31 - __cntlz(x & -x);
|
|
}
|
|
|
|
/*
|
|
* ffs: Find first bit set in word. This is defined the same way as
|
|
* the libc and compiler builtin ffs routines, therefore
|
|
* differs in spirit from the above ffz (man ffs).
|
|
*/
|
|
|
|
static inline int ffs(unsigned long x)
|
|
{
|
|
return 32 - __cntlz(x & -x);
|
|
}
|
|
|
|
/*
|
|
* fls: Find last (most-significant) bit set in word.
|
|
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
|
|
*/
|
|
|
|
static inline int fls (unsigned int x)
|
|
{
|
|
return 32 - __cntlz(x);
|
|
}
|
|
|
|
#else
|
|
|
|
/* Use the generic implementation if we don't have the nsa/nsau instructions. */
|
|
|
|
# include <asm-generic/bitops/ffs.h>
|
|
# include <asm-generic/bitops/__ffs.h>
|
|
# include <asm-generic/bitops/ffz.h>
|
|
# include <asm-generic/bitops/fls.h>
|
|
|
|
#endif
|
|
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/find.h>
|
|
#include <asm-generic/bitops/ext2-non-atomic.h>
|
|
|
|
#ifdef __XTENSA_EL__
|
|
# define ext2_set_bit_atomic(lock,nr,addr) \
|
|
test_and_set_bit((nr), (unsigned long*)(addr))
|
|
# define ext2_clear_bit_atomic(lock,nr,addr) \
|
|
test_and_clear_bit((nr), (unsigned long*)(addr))
|
|
#elif defined(__XTENSA_EB__)
|
|
# define ext2_set_bit_atomic(lock,nr,addr) \
|
|
test_and_set_bit((nr) ^ 0x18, (unsigned long*)(addr))
|
|
# define ext2_clear_bit_atomic(lock,nr,addr) \
|
|
test_and_clear_bit((nr) ^ 0x18, (unsigned long*)(addr))
|
|
#else
|
|
# error processor byte order undefined!
|
|
#endif
|
|
|
|
#include <asm-generic/bitops/hweight.h>
|
|
#include <asm-generic/bitops/lock.h>
|
|
#include <asm-generic/bitops/sched.h>
|
|
#include <asm-generic/bitops/minix.h>
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _XTENSA_BITOPS_H */
|