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Ingo Molnar dc1829a4c3 [PATCH] i386/x86_64: ACPI cpu_idle_wait() fix ... The scheduler on Andreas Friedrich's hyperthreading system stopped working properly: the scheduler would never move tasks to another CPU! The lask known working kernel was 2.6.8. After a couple of attempts to corner the bug, the following smoking gun was found: BIOS reported wrong ACPI idfor the processor CPU#1: set_cpus_allowed(), swapper:1, 3 -> 2 [<c0103bbe>] show_trace_log_lvl+0x34/0x4a [<c0103ceb>] show_trace+0x2c/0x2e [<c01045f8>] dump_stack+0x2b/0x2d [<c0116a77>] set_cpus_allowed+0x52/0xec [<c0101d86>] cpu_idle_wait+0x2e/0x100 [<c0259c57>] acpi_processor_power_exit+0x45/0x58 [<c0259752>] acpi_processor_remove+0x46/0xea [<c025c6fb>] acpi_start_single_object+0x47/0x54 [<c025cee5>] acpi_bus_register_driver+0xa4/0xd3 [<c04ab2d7>] acpi_processor_init+0x57/0x77 [<c01004d7>] init+0x146/0x2fd [<c0103a87>] kernel_thread_helper+0x7/0x10 a quick look at cpu_idle_wait() shows how broken that code is on i386: it changes the init task's affinity map but never restores it ... and because all userspace tasks get forked by init, they all inherited that single-CPU affinity mask. x86_64 cloned this bug too. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Andreas Friedrich <andreas.friedrich@fujitsu-siemens.com> Cc: Wolfgang Erig <Wolfgang.Erig@fujitsu-siemens.com> Cc: Andrew Morton <akpm@osdl.org> Cc: Adrian Bunk <bunk@stusta.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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alpha	Update for the srm_env driver.	19 years ago
arm	[ARM] Remove OP_MAX_COUNTER	19 years ago
arm26	[PATCH] remove bogus arch-specific syscall exports	19 years ago
avr32	AVR32: Add missing return instruction in __raw_writesb	19 years ago
cris	[PATCH] cryptocop: double spin_lock_irqsave()	19 years ago
frv	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago
h8300	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago
i386	[PATCH] i386/x86_64: ACPI cpu_idle_wait() fix	19 years ago
ia64	[IA64] a fix towards allmodconfig build	19 years ago
m32r	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago
m68k	[PATCH] m68k: consolidate initcall sections	19 years ago
m68knommu	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago
mips	[MIPS] Fix EV64120 and Ocelot builds by providing a plat_timer_setup().	19 years ago
parisc	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago
powerpc	[PATCH] hugetlb: prepare_hugepage_range check offset too	19 years ago
ppc	[POWERPC] Make alignment exception always check exception table	19 years ago
s390	[S390] IRQs too early enabled.	19 years ago
sh	sh: Titan defconfig update.	19 years ago
sh64	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago
sparc	[SPARC]: Fix robust futex syscalls and wire up migrate_pages.	19 years ago
sparc64	[SPARC]: Fix robust futex syscalls and wire up migrate_pages.	19 years ago
um	[PATCH] uml: include tidying	19 years ago
v850	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago
x86_64	[PATCH] i386/x86_64: ACPI cpu_idle_wait() fix	19 years ago
xtensa	[PATCH] vmlinux.lds: consolidate initcall sections	19 years ago