Will Deacon 9effb1b259 ARM: 7467/1: mutex: use generic xchg-based implementation for ARMv6+ ... commit a76d7bd96d upstream. The open-coded mutex implementation for ARMv6+ cores suffers from a severe lack of barriers, so in the uncontended case we don't actually protect any accesses performed during the critical section. Furthermore, the code is largely a duplication of the ARMv6+ atomic_dec code but optimised to remove a branch instruction, as the mutex fastpath was previously inlined. Now that this is executed out-of-line, we can reuse the atomic access code for the locking (in fact, we use the xchg code as this produces shorter critical sections). This patch uses the generic xchg based implementation for mutexes on ARMv6+, which introduces barriers to the lock/unlock operations and also has the benefit of removing a fair amount of inline assembly code. Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Nicolas Pitre <nico@linaro.org> Reported-by: Shan Kang <kangshan0910@gmail.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2012-10-02 10:30:49 -07:00
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alpha	Redefine ATOMIC_INIT and ATOMIC64_INIT to drop the casts	2012-10-02 10:29:55 -07:00
arm	ARM: 7467/1: mutex: use generic xchg-based implementation for ARMv6+	2012-10-02 10:30:49 -07:00
avr32
blackfin
c6x
cris
frv	frv: delete incorrect task prototypes causing compile fail	2012-05-17 18:00:51 -07:00
h8300
hexagon
ia64	random: remove rand_initialize_irq()	2012-08-15 08:10:29 -07:00
m32r
m68k	m68k: Correct the Atari ALLOWINT definition	2012-08-09 08:31:53 -07:00
microblaze	microblaze: Do not select GENERIC_GPIO by default	2012-06-10 00:36:05 +09:00
mips	MIPS: mm: Add compound tail page _mapcount when mapped	2012-10-02 10:30:09 -07:00
mn10300
openrisc
parisc	PARISC: Redefine ATOMIC_INIT and ATOMIC64_INIT to drop the casts	2012-09-14 10:00:33 -07:00
powerpc	powerpc/85xx: p1022ds: fix DIU/LBC switching with NAND enabled	2012-10-02 10:30:37 -07:00
s390	oprofile, s390: Fix uninitialized memory access when writing to oprofilefs	2012-10-02 10:29:55 -07:00
score
sh
sparc	KEYS: Use the compat keyctl() syscall wrapper on Sparc64 for Sparc32 compat	2012-06-01 15:18:16 +08:00
tile	tile: fix bug where fls(0) was not returning 0	2012-06-01 15:18:27 +08:00
um	um: Implement a custom pte_same() function	2012-06-01 15:18:18 +08:00
unicore32
x86	x86: Fix boot on Twinhead H12Y	2012-10-02 10:30:33 -07:00
xtensa
.gitignore
Kconfig