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Ingo Molnar 9a24d04a3c x86: fix global_flush_tlb() bug ... While we were reviewing pageattr_32/64.c for unification, Thomas Gleixner noticed the following serious SMP bug in global_flush_tlb(): down_read(&init_mm.mmap_sem); list_replace_init(&deferred_pages, &l); up_read(&init_mm.mmap_sem); this is SMP-unsafe because list_replace_init() done on two CPUs in parallel can corrupt the list. This bug has been introduced about a year ago in the 64-bit tree: commit ea7322decb Author: Andi Kleen <ak@suse.de> Date: Thu Dec 7 02:14:05 2006 +0100 [PATCH] x86-64: Speed and clean up cache flushing in change_page_attr down_read(&init_mm.mmap_sem); - dpage = xchg(&deferred_pages, NULL); + list_replace_init(&deferred_pages, &l); up_read(&init_mm.mmap_sem); the xchg() based version was SMP-safe, but list_replace_init() is not. So this "cleanup" introduced a nasty bug. why this bug never become prominent is a mystery - it can probably be explained with the (still) relative obscurity of the x86_64 architecture. the safe fix for now is to write-lock init_mm.mmap_sem. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		18 years ago
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boot	[x86] remove uses of magic macros for boot_params access	18 years ago
crypto	…
ia32	sysctl: x86_64 remove unnecessary binary paths	18 years ago
kernel	sparse pointer use of zero as null	18 years ago
lib	x86: rename .i assembler includes to .h	18 years ago
mach-default	x86: clean up struct irqaction initializers	18 years ago
mach-es7000	i386: es7000 minor cleanups	18 years ago
mach-generic	i386: make struct apic_probe static	18 years ago
mach-visws	[x86] remove uses of magic macros for boot_params access	18 years ago
mach-voyager	x86: expand /proc/interrupts to include missing vectors, v2	18 years ago
math-emu	kbuild: fix up CFLAGS usage	18 years ago
mm	x86: fix global_flush_tlb() bug	18 years ago
oprofile	i386: make Oprofile call shutdown() only once per session	18 years ago
pci	x86: pci use pci=bfsort for HP DL385 G2 and DL585 G2	18 years ago
power	…
vdso	x86: vdso linker script cleanup	18 years ago
video	…
xen	Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-x86	18 years ago