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726328d92a
This patch updates/fixes all spin_unlock_wait() implementations. The update is in semantics; where it previously was only a control dependency, we now upgrade to a full load-acquire to match the store-release from the spin_unlock() we waited on. This ensures that when spin_unlock_wait() returns, we're guaranteed to observe the full critical section we waited on. This fixes a number of spin_unlock_wait() users that (not unreasonably) rely on this. I also fixed a number of ticket lock versions to only wait on the current lock holder, instead of for a full unlock, as this is sufficient. Furthermore; again for ticket locks; I added an smp_rmb() in between the initial ticket load and the spin loop testing the current value because I could not convince myself the address dependency is sufficient, esp. if the loads are of different sizes. I'm more than happy to remove this smp_rmb() again if people are certain the address dependency does indeed work as expected. Note: PPC32 will be fixed independently Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: chris@zankel.net Cc: cmetcalf@mellanox.com Cc: davem@davemloft.net Cc: dhowells@redhat.com Cc: james.hogan@imgtec.com Cc: jejb@parisc-linux.org Cc: linux@armlinux.org.uk Cc: mpe@ellerman.id.au Cc: ralf@linux-mips.org Cc: realmz6@gmail.com Cc: rkuo@codeaurora.org Cc: rth@twiddle.net Cc: schwidefsky@de.ibm.com Cc: tony.luck@intel.com Cc: vgupta@synopsys.com Cc: ysato@users.sourceforge.jp Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| m32104ut | ||
| m32700ut | ||
| mappi2 | ||
| mappi3 | ||
| opsput | ||
| addrspace.h | ||
| asm-offsets.h | ||
| assembler.h | ||
| atomic.h | ||
| barrier.h | ||
| bitops.h | ||
| bug.h | ||
| bugs.h | ||
| cache.h | ||
| cachectl.h | ||
| cacheflush.h | ||
| checksum.h | ||
| cmpxchg.h | ||
| current.h | ||
| dcache_clear.h | ||
| delay.h | ||
| device.h | ||
| div64.h | ||
| dma.h | ||
| elf.h | ||
| emergency-restart.h | ||
| fb.h | ||
| flat.h | ||
| ftrace.h | ||
| futex.h | ||
| hardirq.h | ||
| hw_irq.h | ||
| io.h | ||
| irq_regs.h | ||
| irq.h | ||
| irqflags.h | ||
| Kbuild | ||
| kdebug.h | ||
| kmap_types.h | ||
| linkage.h | ||
| local64.h | ||
| local.h | ||
| m32r_mp_fpga.h | ||
| m32r.h | ||
| m32102.h | ||
| mc146818rtc.h | ||
| mmu_context.h | ||
| mmu.h | ||
| mmzone.h | ||
| mutex.h | ||
| page.h | ||
| pci.h | ||
| percpu.h | ||
| pgalloc.h | ||
| pgtable-2level.h | ||
| pgtable.h | ||
| processor.h | ||
| ptrace.h | ||
| rtc.h | ||
| s1d13806.h | ||
| segment.h | ||
| serial.h | ||
| setup.h | ||
| shmparam.h | ||
| signal.h | ||
| smp.h | ||
| spinlock_types.h | ||
| spinlock.h | ||
| string.h | ||
| switch_to.h | ||
| syscall.h | ||
| termios.h | ||
| thread_info.h | ||
| timex.h | ||
| tlb.h | ||
| tlbflush.h | ||
| topology.h | ||
| types.h | ||
| uaccess.h | ||
| ucontext.h | ||
| unaligned.h | ||
| unistd.h | ||
| user.h | ||
| vga.h | ||
| xor.h | ||