mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 08:43:31 +00:00
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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| .. | ||
| agp.h | ||
| apb.h | ||
| asm-offsets.h | ||
| asm.h | ||
| asmmacro.h | ||
| atomic.h | ||
| atomic_32.h | ||
| atomic_64.h | ||
| auxio.h | ||
| auxio_32.h | ||
| auxio_64.h | ||
| backoff.h | ||
| barrier.h | ||
| barrier_32.h | ||
| barrier_64.h | ||
| bbc.h | ||
| bitext.h | ||
| bitops.h | ||
| bitops_32.h | ||
| bitops_64.h | ||
| btext.h | ||
| bug.h | ||
| bugs.h | ||
| cache.h | ||
| cacheflush.h | ||
| cacheflush_32.h | ||
| cacheflush_64.h | ||
| cachetlb_32.h | ||
| chafsr.h | ||
| checksum.h | ||
| checksum_32.h | ||
| checksum_64.h | ||
| chmctrl.h | ||
| clock.h | ||
| cmpxchg.h | ||
| cmpxchg_32.h | ||
| cmpxchg_64.h | ||
| compat.h | ||
| compat_signal.h | ||
| contregs.h | ||
| cpu_type.h | ||
| cpudata.h | ||
| cpudata_32.h | ||
| cpudata_64.h | ||
| current.h | ||
| dcr.h | ||
| dcu.h | ||
| delay.h | ||
| delay_32.h | ||
| delay_64.h | ||
| device.h | ||
| dma-mapping.h | ||
| dma.h | ||
| ebus_dma.h | ||
| ecc.h | ||
| eeprom.h | ||
| elf.h | ||
| elf_32.h | ||
| elf_64.h | ||
| estate.h | ||
| fb.h | ||
| fbio.h | ||
| fhc.h | ||
| floppy.h | ||
| floppy_32.h | ||
| floppy_64.h | ||
| fpumacro.h | ||
| ftrace.h | ||
| futex.h | ||
| futex_32.h | ||
| futex_64.h | ||
| hardirq.h | ||
| hardirq_32.h | ||
| hardirq_64.h | ||
| head.h | ||
| head_32.h | ||
| head_64.h | ||
| hibernate.h | ||
| highmem.h | ||
| hugetlb.h | ||
| hvtramp.h | ||
| hw_irq.h | ||
| hypervisor.h | ||
| ide.h | ||
| idprom.h | ||
| intr_queue.h | ||
| io-unit.h | ||
| io.h | ||
| io_32.h | ||
| io_64.h | ||
| ioctls.h | ||
| iommu.h | ||
| iommu_32.h | ||
| iommu_64.h | ||
| irq.h | ||
| irq_32.h | ||
| irq_64.h | ||
| irqflags.h | ||
| irqflags_32.h | ||
| irqflags_64.h | ||
| jump_label.h | ||
| Kbuild | ||
| kdebug.h | ||
| kdebug_32.h | ||
| kdebug_64.h | ||
| kgdb.h | ||
| kmap_types.h | ||
| kprobes.h | ||
| ldc.h | ||
| leon.h | ||
| leon_amba.h | ||
| leon_pci.h | ||
| lsu.h | ||
| machines.h | ||
| mbus.h | ||
| mc146818rtc.h | ||
| mc146818rtc_32.h | ||
| mc146818rtc_64.h | ||
| mdesc.h | ||
| memctrl.h | ||
| mman.h | ||
| mmu.h | ||
| mmu_32.h | ||
| mmu_64.h | ||
| mmu_context.h | ||
| mmu_context_32.h | ||
| mmu_context_64.h | ||
| mmzone.h | ||
| msi.h | ||
| mxcc.h | ||
| nmi.h | ||
| ns87303.h | ||
| obio.h | ||
| openprom.h | ||
| oplib.h | ||
| oplib_32.h | ||
| oplib_64.h | ||
| page.h | ||
| page_32.h | ||
| page_64.h | ||
| parport.h | ||
| pbm.h | ||
| pci.h | ||
| pci_32.h | ||
| pci_64.h | ||
| pcic.h | ||
| pcr.h | ||
| percpu.h | ||
| percpu_32.h | ||
| percpu_64.h | ||
| perf_event.h | ||
| pgalloc.h | ||
| pgalloc_32.h | ||
| pgalloc_64.h | ||
| pgtable.h | ||
| pgtable_32.h | ||
| pgtable_64.h | ||
| pgtsrmmu.h | ||
| pil.h | ||
| processor.h | ||
| processor_32.h | ||
| processor_64.h | ||
| prom.h | ||
| psr.h | ||
| ptrace.h | ||
| ross.h | ||
| sbi.h | ||
| scratchpad.h | ||
| seccomp.h | ||
| sections.h | ||
| setup.h | ||
| sfafsr.h | ||
| sfp-machine.h | ||
| sfp-machine_32.h | ||
| sfp-machine_64.h | ||
| shmparam.h | ||
| shmparam_32.h | ||
| shmparam_64.h | ||
| sigcontext.h | ||
| siginfo.h | ||
| signal.h | ||
| smp.h | ||
| smp_32.h | ||
| smp_64.h | ||
| sparsemem.h | ||
| spinlock.h | ||
| spinlock_32.h | ||
| spinlock_64.h | ||
| spinlock_types.h | ||
| spitfire.h | ||
| stacktrace.h | ||
| starfire.h | ||
| string.h | ||
| string_32.h | ||
| string_64.h | ||
| sunbpp.h | ||
| swift.h | ||
| switch_to.h | ||
| switch_to_32.h | ||
| switch_to_64.h | ||
| syscall.h | ||
| syscalls.h | ||
| termbits.h | ||
| termios.h | ||
| thread_info.h | ||
| thread_info_32.h | ||
| thread_info_64.h | ||
| timer.h | ||
| timer_32.h | ||
| timer_64.h | ||
| timex.h | ||
| timex_32.h | ||
| timex_64.h | ||
| tlb.h | ||
| tlb_32.h | ||
| tlb_64.h | ||
| tlbflush.h | ||
| tlbflush_32.h | ||
| tlbflush_64.h | ||
| topology.h | ||
| topology_32.h | ||
| topology_64.h | ||
| trap_block.h | ||
| traps.h | ||
| tsb.h | ||
| tsunami.h | ||
| ttable.h | ||
| turbosparc.h | ||
| uaccess.h | ||
| uaccess_32.h | ||
| uaccess_64.h | ||
| unaligned.h | ||
| unistd.h | ||
| upa.h | ||
| user.h | ||
| vaddrs.h | ||
| vga.h | ||
| viking.h | ||
| vio.h | ||
| visasm.h | ||
| winmacro.h | ||
| xor.h | ||
| xor_32.h | ||
| xor_64.h | ||