Revision 73863ab028579ed98c4f1f36d016536b1b415344 authored by Anton Vorontsov on 31 May 2012, 23:26:23 UTC, committed by Linus Torvalds on 01 June 2012, 00:49:29 UTC
Current CPU hotplug code has some task->mm handling issues: 1. Working with task->mm w/o getting mm or grabing the task lock is dangerous as ->mm might disappear (exit_mm() assigns NULL under task_lock(), so tasklist lock is not enough). We can't use get_task_mm()/mmput() pair as mmput() might sleep, so we must take the task lock while handle its mm. 2. Checking for process->mm is not enough because process' main thread may exit or detach its mm via use_mm(), but other threads may still have a valid mm. To fix this we would need to use find_lock_task_mm(), which would walk up all threads and returns an appropriate task (with task lock held). clear_tasks_mm_cpumask() has all the issues fixed, so let's use it. Suggested-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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File | Mode | Size |
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Kconfig | -rw-r--r-- | 13.3 KB |
Makefile | -rw-r--r-- | 2.5 KB |
spi-altera.c | -rw-r--r-- | 7.9 KB |
spi-ath79.c | -rw-r--r-- | 6.4 KB |
spi-atmel.c | -rw-r--r-- | 27.5 KB |
spi-au1550.c | -rw-r--r-- | 26.1 KB |
spi-bcm63xx.c | -rw-r--r-- | 11.9 KB |
spi-bfin-sport.c | -rw-r--r-- | 23.0 KB |
spi-bfin5xx.c | -rw-r--r-- | 40.5 KB |
spi-bitbang-txrx.h | -rw-r--r-- | 3.0 KB |
spi-bitbang.c | -rw-r--r-- | 13.1 KB |
spi-butterfly.c | -rw-r--r-- | 8.5 KB |
spi-coldfire-qspi.c | -rw-r--r-- | 15.2 KB |
spi-davinci.c | -rw-r--r-- | 26.3 KB |
spi-dw-mid.c | -rw-r--r-- | 6.0 KB |
spi-dw-mmio.c | -rw-r--r-- | 3.2 KB |
spi-dw-pci.c | -rw-r--r-- | 3.9 KB |
spi-dw.c | -rw-r--r-- | 22.2 KB |
spi-dw.h | -rw-r--r-- | 5.8 KB |
spi-ep93xx.c | -rw-r--r-- | 30.8 KB |
spi-fsl-espi.c | -rw-r--r-- | 17.7 KB |
spi-fsl-lib.c | -rw-r--r-- | 5.8 KB |
spi-fsl-lib.h | -rw-r--r-- | 3.5 KB |
spi-fsl-spi.c | -rw-r--r-- | 27.8 KB |
spi-gpio.c | -rw-r--r-- | 11.9 KB |
spi-imx.c | -rw-r--r-- | 24.2 KB |
spi-lm70llp.c | -rw-r--r-- | 9.1 KB |
spi-mpc512x-psc.c | -rw-r--r-- | 13.7 KB |
spi-mpc52xx-psc.c | -rw-r--r-- | 13.3 KB |
spi-mpc52xx.c | -rw-r--r-- | 14.4 KB |
spi-nuc900.c | -rw-r--r-- | 9.9 KB |
spi-oc-tiny.c | -rw-r--r-- | 10.2 KB |
spi-omap-100k.c | -rw-r--r-- | 15.6 KB |
spi-omap-uwire.c | -rw-r--r-- | 13.3 KB |
spi-omap2-mcspi.c | -rw-r--r-- | 32.2 KB |
spi-orion.c | -rw-r--r-- | 12.9 KB |
spi-pl022.c | -rw-r--r-- | 63.9 KB |
spi-ppc4xx.c | -rw-r--r-- | 13.9 KB |
spi-pxa2xx-pci.c | -rw-r--r-- | 3.8 KB |
spi-pxa2xx.c | -rw-r--r-- | 47.0 KB |
spi-rspi.c | -rw-r--r-- | 19.0 KB |
spi-s3c24xx-fiq.S | -rw-r--r-- | 2.9 KB |
spi-s3c24xx-fiq.h | -rw-r--r-- | 671 bytes |
spi-s3c24xx.c | -rw-r--r-- | 16.3 KB |
spi-s3c64xx.c | -rw-r--r-- | 32.5 KB |
spi-sh-hspi.c | -rw-r--r-- | 7.0 KB |
spi-sh-msiof.c | -rw-r--r-- | 17.3 KB |
spi-sh-sci.c | -rw-r--r-- | 4.7 KB |
spi-sh.c | -rw-r--r-- | 12.3 KB |
spi-sirf.c | -rw-r--r-- | 18.5 KB |
spi-stmp.c | -rw-r--r-- | 15.6 KB |
spi-tegra.c | -rw-r--r-- | 15.6 KB |
spi-ti-ssp.c | -rw-r--r-- | 9.2 KB |
spi-tle62x0.c | -rw-r--r-- | 7.5 KB |
spi-topcliff-pch.c | -rw-r--r-- | 48.3 KB |
spi-txx9.c | -rw-r--r-- | 12.0 KB |
spi-xilinx.c | -rw-r--r-- | 15.2 KB |
spi.c | -rw-r--r-- | 42.9 KB |
spidev.c | -rw-r--r-- | 17.4 KB |
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