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David Hildenbrand 388b0e0adb sched/preempt, arm/futex: Disable preemption in UP futex_atomic_op_inuser() explicitly 
The !CONFIG_SMP implementation of futex_atomic_op_inuser() seems to rely
on disabled preemption to guarantee mutual exclusion.

From commit e589ed23dd ("[ARM] 5218/1: arm: improved futex support"):

    "For UP it's enough to disable preemption to ensure mutual exclusion..."

From the code itself:

    "!SMP, we can work around lack of atomic ops by disabling preemption"

Let's make this explicit, to prepare for pagefault_disable() not
touching preemption anymore.

Reviewed-and-tested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: David.Laight@ACULAB.COM
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: airlied@linux.ie
Cc: akpm@linux-foundation.org
Cc: benh@kernel.crashing.org
Cc: bigeasy@linutronix.de
Cc: borntraeger@de.ibm.com
Cc: daniel.vetter@intel.com
Cc: heiko.carstens@de.ibm.com
Cc: herbert@gondor.apana.org.au
Cc: hocko@suse.cz
Cc: hughd@google.com
Cc: mst@redhat.com
Cc: paulus@samba.org
Cc: ralf@linux-mips.org
Cc: schwidefsky@de.ibm.com
Cc: yang.shi@windriver.com
Link: http://lkml.kernel.org/r/1431359540-32227-12-git-send-email-dahi@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19 08:39:17 +02:00
..
boot Samsung 2nd fixes for v4.1 2015-05-15 17:14:48 +02:00
common ARM: SoC platform updates for v4.1 2015-04-22 09:08:39 -07:00
configs ARM: multi_v7_defconfig: Select more FSL SoCs 2015-05-07 18:31:00 +02:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2015-04-15 10:42:15 -07:00
firmware
include sched/preempt, arm/futex: Disable preemption in UP futex_atomic_op_inuser() explicitly 2015-05-19 08:39:17 +02:00
kernel ARM: 8352/1: perf: Fix the pmu node name in warning message 2015-05-03 23:23:44 +01:00
kvm This mostly includes the PPC changes for 4.1, which this time cover 2015-04-26 13:06:22 -07:00
lib ARM: ensure delay timer has sufficient accuracy for delays 2015-04-14 22:28:07 +01:00
mach-alpine ARM: alpine: add support for generic pci 2015-04-14 01:15:57 +02:00
mach-asm9260
mach-at91 Fourth batch of cleanup for 4.1: 2015-04-14 01:50:21 +02:00
mach-axxia
mach-bcm ARM: cygnus: fix const declaration bcm_cygnus_dt_compat 2015-03-24 15:13:23 -07:00
mach-berlin
mach-clps711x
mach-cns3xxx ARM: cns3xxx: don't export static symbol 2015-03-13 11:02:15 +01:00
mach-davinci ARM: DT updates for v4.1 2015-04-22 09:09:46 -07:00
mach-digicolor
mach-dove PCI: Cleanup control flow 2015-03-19 10:17:22 -05:00
mach-ebsa110
mach-efm32
mach-ep93xx
mach-exynos ARM: EXYNOS: Use of_machine_is_compatible instead of soc_is_exynos4 2015-05-14 11:43:59 +09:00
mach-footbridge
mach-gemini ARM: gemini: fix compiler warning due wrong data type 2015-05-12 16:45:23 +02:00
mach-highbank
mach-hisi
mach-imx ARM: mach-imx: devices: platform-sdhci-esdhc-imx: fix broken email address 2015-04-27 20:37:06 +08:00
mach-integrator
mach-iop13xx
mach-iop32x
mach-iop33x
mach-ixp4xx
mach-keystone
mach-ks8695
mach-lpc32xx
mach-mediatek ARM: mediatek: enable the pin controller 2015-03-10 14:31:10 +01:00
mach-meson
mach-mmp
mach-moxart
mach-mv78xx0 PCI: Cleanup control flow 2015-03-19 10:17:22 -05:00
mach-mvebu ARM: SoC platform updates for v4.1 2015-04-22 09:08:39 -07:00
mach-mxs
mach-netx
mach-nomadik
mach-nspire
mach-omap1 ARM: OMAP1: PM: fix some build warnings on 1510-only Kconfigs 2015-03-16 16:09:23 -07:00
mach-omap2 ARM: OMAP2+: first set of hwmod fixes for v4.1-rc 2015-05-11 13:23:19 -07:00
mach-orion5x PCI: Cleanup control flow 2015-03-19 10:17:22 -05:00
mach-picoxcell
mach-prima2
mach-pxa ARM: pxa: lubbock: use new pxa_cplds driver 2015-04-30 22:52:51 +02:00
mach-qcom firmware: qcom: scm: Clean cold boot entry to export only the API 2015-03-11 15:15:05 -05:00
mach-realview
mach-rockchip Revert "ARM: rockchip: fix undefined instruction of reset_ctrl_regs" 2015-05-13 15:47:03 +02:00
mach-rpc
mach-s3c24xx
mach-s3c64xx ARM: SoC platform updates for v4.1 2015-04-22 09:08:39 -07:00
mach-s5pv210 ARM: 8326/1: s5pv210: move resume code to .text section 2015-03-29 23:11:58 +01:00
mach-sa1100
mach-shmobile Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
mach-socfpga
mach-spear
mach-sti ARM: STi: Add STiH410 SoC support 2015-03-11 15:34:45 +01:00
mach-sunxi
mach-tegra Power management and ACPI updates for v4.1-rc1 2015-04-14 20:21:54 -07:00
mach-u300
mach-ux500 ARM: ux500: switch from gic_arch_extn to gic_set_irqchip_flags 2015-03-15 01:28:11 +00:00
mach-versatile
mach-vexpress ARM: SoC driver updates for v4.1 2015-04-22 09:18:17 -07:00
mach-vt8500
mach-w90x900
mach-zynq ARM: zynq: switch from gic_arch_extn to gic_set_irqchip_flags 2015-03-15 01:28:12 +00:00
mm mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler 2015-05-19 08:39:15 +02:00
net ARM: net: delegate filter to kernel interpreter when imm_offset() return value can't fit into 12bits. 2015-05-10 19:21:49 -04:00
nwfpe ARM: 8322/1: keep .text and .fixup regions closer together 2015-03-29 23:11:56 +01:00
oprofile
plat-iop
plat-omap ARM, clocksource/drivers: Provide read_boot_clock64() and read_persistent_clock64() and use them 2015-04-03 08:18:23 +02:00
plat-orion
plat-pxa ARM: plat-pxa: remove use of seq_printf return value 2015-04-15 16:35:25 -07:00
plat-samsung
plat-versatile
probes
tools
vdso ARM: 8344/1: VDSO: honor CONFIG_VDSO in Makefile 2015-04-21 15:28:02 +01:00
vfp
xen xen: Add __GFP_DMA flag when xen_swiotlb_init gets free pages on ARM 2015-05-06 15:02:58 +01:00
Kconfig ARM: SoC multiplatform code changes for v4.1 2015-04-22 09:20:15 -07:00
Kconfig-nommu
Kconfig.debug ARM: SoC multiplatform code changes for v4.1 2015-04-22 09:20:15 -07:00
Makefile ARM: SoC platform updates for v4.1 2015-04-22 09:08:39 -07:00