Commit 4badad35 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar

locking/mutex: Disable optimistic spinning on some architectures

The optimistic spin code assumes regular stores and cmpxchg() play nice;
this is found to not be true for at least: parisc, sparc32, tile32,
metag-lock1, arc-!llsc and hexagon.

There is further wreckage, but this in particular seemed easy to
trigger, so blacklist this.

Opt in for known good archs.
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Reported-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Cc: David Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Jason Low <jason.low2@hp.com>
Cc: Waiman Long <waiman.long@hp.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: John David Anglin <dave.anglin@bell.net>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Davidlohr Bueso <davidlohr@hp.com>
Cc: stable@vger.kernel.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: sparclinux@vger.kernel.org
Link: http://lkml.kernel.org/r/20140606175316.GV13930@laptop.programming.kicks-ass.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent ce069fc9
...@@ -6,6 +6,7 @@ config ARM ...@@ -6,6 +6,7 @@ config ARM
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_CUSTOM_GPIO_H select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_IPC_PARSE_VERSION
......
...@@ -4,6 +4,7 @@ config ARM64 ...@@ -4,6 +4,7 @@ config ARM64
select ARCH_HAS_OPP select ARCH_HAS_OPP
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_USE_CMPXCHG_LOCKREF select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_WANT_OPTIONAL_GPIOLIB select ARCH_WANT_OPTIONAL_GPIOLIB
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_FRAME_POINTERS
......
...@@ -145,6 +145,7 @@ config PPC ...@@ -145,6 +145,7 @@ config PPC
select HAVE_IRQ_EXIT_ON_IRQ_STACK select HAVE_IRQ_EXIT_ON_IRQ_STACK
select ARCH_USE_CMPXCHG_LOCKREF if PPC64 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_AUDITSYSCALL
select ARCH_SUPPORTS_ATOMIC_RMW
config GENERIC_CSUM config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN def_bool CPU_LITTLE_ENDIAN
......
...@@ -78,6 +78,7 @@ config SPARC64 ...@@ -78,6 +78,7 @@ config SPARC64
select HAVE_C_RECORDMCOUNT select HAVE_C_RECORDMCOUNT
select NO_BOOTMEM select NO_BOOTMEM
select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_AUDITSYSCALL
select ARCH_SUPPORTS_ATOMIC_RMW
config ARCH_DEFCONFIG config ARCH_DEFCONFIG
string string
......
...@@ -131,6 +131,7 @@ config X86 ...@@ -131,6 +131,7 @@ config X86
select HAVE_CC_STACKPROTECTOR select HAVE_CC_STACKPROTECTOR
select GENERIC_CPU_AUTOPROBE select GENERIC_CPU_AUTOPROBE
select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_AUDITSYSCALL
select ARCH_SUPPORTS_ATOMIC_RMW
config INSTRUCTION_DECODER config INSTRUCTION_DECODER
def_bool y def_bool y
......
...@@ -220,9 +220,12 @@ config INLINE_WRITE_UNLOCK_IRQRESTORE ...@@ -220,9 +220,12 @@ config INLINE_WRITE_UNLOCK_IRQRESTORE
endif endif
config ARCH_SUPPORTS_ATOMIC_RMW
bool
config MUTEX_SPIN_ON_OWNER config MUTEX_SPIN_ON_OWNER
def_bool y def_bool y
depends on SMP && !DEBUG_MUTEXES depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW
config ARCH_USE_QUEUE_RWLOCK config ARCH_USE_QUEUE_RWLOCK
bool bool
......
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