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Will Deacon 5f40b90972 ARM: 7559/1: smp: switch away from the idmap before updating init_mm.mm_count ... When booting a secondary CPU, the primary CPU hands two sets of page tables via the secondary_data struct: (1) swapper_pg_dir: a normal, cacheable, shared (if SMP) mapping of the kernel image (i.e. the tables used by init_mm). (2) idmap_pgd: an uncached mapping of the .idmap.text ELF section. The idmap is generally used when enabling and disabling the MMU, which includes early CPU boot. In this case, the secondary CPU switches to swapper as soon as it enters C code: struct mm_struct *mm = &init_mm; unsigned int cpu = smp_processor_id(); /* * All kernel threads share the same mm context; grab a * reference and switch to it. */ atomic_inc(&mm->mm_count); current->active_mm = mm; cpumask_set_cpu(cpu, mm_cpumask(mm)); cpu_switch_mm(mm->pgd, mm); This causes a problem on ARMv7, where the identity mapping is treated as strongly-ordered leading to architecturally UNPREDICTABLE behaviour of exclusive accesses, such as those used by atomic_inc. This patch re-orders the secondary_start_kernel function so that we switch to swapper before performing any exclusive accesses. Cc: <stable@vger.kernel.org> Cc: David McKay <david.mckay@st.com> Reported-by: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>		12 years ago
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boot	Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm	12 years ago
common	ARM: config: sort select statements alphanumerically	12 years ago
configs	UAPI Disintegration 2012-10-09	13 years ago
crypto	arm/crypto: Add optimized AES and SHA1 routines	13 years ago
include	Merge branch 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux	12 years ago
kernel	ARM: 7559/1: smp: switch away from the idmap before updating init_mm.mm_count	12 years ago
lib	Merge branch 'arch-timers' into for-linus	13 years ago
mach-at91	ARM: config: sort select statements alphanumerically	12 years ago
mach-bcm2835	ARM: dtb: move all dtb targets to common Makefile	13 years ago
mach-clps711x	ARM: config: sort select statements alphanumerically	12 years ago
mach-cns3xxx	…
mach-davinci	ARM: config: sort select statements alphanumerically	12 years ago
mach-dove	Merge branch 'samsung_platform_data' into staging/for_v3.7	13 years ago
mach-ebsa110	ARM: soc: driver specific changes	13 years ago
mach-ep93xx	ARM: soc: multiplatform enablement	13 years ago
mach-exynos	ARM: config: sort select statements alphanumerically	12 years ago
mach-footbridge	ARM: config: sort select statements alphanumerically	12 years ago
mach-gemini	ARM: gemini: fix the gemini build	13 years ago
mach-h720x	ARM: config: sort select statements alphanumerically	12 years ago
mach-highbank	Merge branch 'for-v3.7' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping	13 years ago
mach-imx	ARM: config: sort select statements alphanumerically	12 years ago
mach-integrator	ARM: integrator: use __iomem pointers for MMIO, part 2	13 years ago
mach-iop13xx	Merge branch 'late/fixes' into fixes	13 years ago
mach-iop32x	Merge branch 'cleanup/__iomem' into next/cleanup	13 years ago
mach-iop33x	…
mach-ixp4xx	ARM: config: sort select statements alphanumerically	12 years ago
mach-kirkwood	Merge branch 'samsung_platform_data' into staging/for_v3.7	13 years ago
mach-ks8695	Merge branch 'late/fixes' into fixes	13 years ago
mach-l7200/include/mach	…
mach-lpc32xx	ARM: soc: multiplatform enablement	13 years ago
mach-mmp	ARM: config: sort select statements alphanumerically	12 years ago
mach-msm	ARM: config: sort select statements alphanumerically	12 years ago
mach-mv78xx0	Merge branch 'late/fixes' into fixes	13 years ago
mach-mvebu	ARM: mvebu: fix build breaks from multi-platform conversion	13 years ago
mach-mxs	ARM: soc: multiplatform enablement	13 years ago
mach-netx	ARM: netx: move platform_data definitions	13 years ago
mach-nomadik	ARM: config: sort select statements alphanumerically	12 years ago
mach-omap1	ARM: config: sort select statements alphanumerically	12 years ago
mach-omap2	ARM: config: sort select statements alphanumerically	12 years ago
mach-orion5x	ARM: soc: late platform updates	13 years ago
mach-picoxcell	ARM: initial multiplatform support	13 years ago
mach-prima2	ARM: config: sort select statements alphanumerically	12 years ago
mach-pxa	ARM: config: sort select statements alphanumerically	12 years ago
mach-realview	ARM: config: sort select statements alphanumerically	12 years ago
mach-rpc	ARM: rpc: check device_register return code in ecard_probe	13 years ago
mach-s3c24xx	ARM: config: sort select statements alphanumerically	12 years ago
mach-s3c64xx	ARM: config: sort select statements alphanumerically	12 years ago
mach-s3c2410	…
mach-s3c2412	ARM: config: sort select statements alphanumerically	12 years ago
mach-s3c2440	ARM: config: sort select statements alphanumerically	12 years ago
mach-s5p64x0	ARM: config: sort select statements alphanumerically	12 years ago
mach-s5pc100	ARM: config: sort select statements alphanumerically	12 years ago
mach-s5pv210	ARM: config: sort select statements alphanumerically	12 years ago
mach-sa1100	ARM: config: sort select statements alphanumerically	12 years ago
mach-shark	Merge branch 'late/fixes' into fixes	13 years ago
mach-shmobile	ARM: config: sort select statements alphanumerically	12 years ago
mach-socfpga	ARM: initial multiplatform support	13 years ago
mach-spear3xx	ARM: move all dtb targets out of Makefile.boot	13 years ago
mach-spear6xx	ARM: move all dtb targets out of Makefile.boot	13 years ago
mach-spear13xx	Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma	12 years ago
mach-tegra	ARM: config: sort select statements alphanumerically	12 years ago
mach-u300	ARM: config: sort select statements alphanumerically	12 years ago
mach-ux500	ARM: config: sort select statements alphanumerically	12 years ago
mach-versatile	ARM: config: sort select statements alphanumerically	12 years ago
mach-vexpress	Features:	13 years ago
mach-vt8500	arm: vt8500: Fix build warning in uncompress.h	13 years ago
mach-w90x900	ARM: w90x900: move platform_data definitions	13 years ago
mach-zynq	…
mm	ARM: config: sort select statements alphanumerically	12 years ago
net	…
nwfpe	…
oprofile	…
plat-iop	Bunch of perf updates for the ARM backend that pave the way for	13 years ago
plat-mxc	ARM: config: sort select statements alphanumerically	12 years ago
plat-nomadik	ARM: config: sort select statements alphanumerically	12 years ago
plat-omap	ARM: config: sort select statements alphanumerically	12 years ago
plat-orion	Merge branch 'samsung_platform_data' into staging/for_v3.7	13 years ago
plat-pxa	ARM: pxa: move platform_data definitions	13 years ago
plat-s3c24xx	ARM: config: sort select statements alphanumerically	12 years ago
plat-samsung	ARM: config: sort select statements alphanumerically	12 years ago
plat-spear	ARM: config: sort select statements alphanumerically	12 years ago
plat-versatile	Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm	13 years ago
tools	ARM: soc: cleanups, part 2	13 years ago
vfp	…
xen	…
Kconfig	Merge branch 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux	12 years ago
Kconfig-nommu	…
Kconfig.debug	ARM: soc: multiplatform enablement	13 years ago
Makefile	Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm	13 years ago