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>
1 parent 3eaa73b
Makefile
#
# arch/arm/boot/Makefile
#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1995-2000 Russell King
#
targets := Image zImage bootpImage
SYSTEM =$(LINUX)
ZTEXTADDR = 0x02080000
PARAMS_PHYS = 0x0207c000
INITRD_PHYS = 0x02180000
INITRD_VIRT = 0x02180000
#
# If you don't define ZRELADDR above,
# then it defaults to ZTEXTADDR
#
ifeq ($(ZRELADDR),)
ZRELADDR = $(ZTEXTADDR)
endif
export SYSTEM ZTEXTADDR ZBSSADDR ZRELADDR INITRD_PHYS INITRD_VIRT PARAMS_PHYS
Image: $(obj)/Image
targets: $(obj)/Image
$(obj)/Image: vmlinux FORCE
$(OBJCOPY) -O binary -R .note -R .comment -S vmlinux $@
#$(obj)/Image: $(CONFIGURE) $(SYSTEM)
# $(OBJCOPY) -O binary -R .note -R .comment -g -S $(SYSTEM) $@
bzImage: zImage
zImage: $(CONFIGURE) compressed/$(LINUX)
$(OBJCOPY) -O binary -R .note -R .comment -S compressed/$(LINUX) $@
bootpImage: bootp/bootp
$(OBJCOPY) -O binary -R .note -R .comment -S bootp/bootp $@
compressed/$(LINUX): $(LINUX) dep
@$(MAKE) -C compressed $(LINUX)
bootp/bootp: zImage initrd
@$(MAKE) -C bootp bootp
initrd:
@test "$(INITRD_VIRT)" != "" || (echo This architecture does not support INITRD; exit -1)
@test "$(INITRD)" != "" || (echo You must specify INITRD; exit -1)
#
# installation
#
install: $(CONFIGURE) Image
sh ./install.sh $(KERNELRELEASE) Image System.map "$(INSTALL_PATH)"
zinstall: $(CONFIGURE) zImage
sh ./install.sh $(KERNELRELEASE) zImage System.map "$(INSTALL_PATH)"
#
# miscellany
#
mrproper clean:
# @$(MAKE) -C compressed clean
# @$(MAKE) -C bootp clean
dep:
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...