kernel_samsung_sm7125

jenna

History

Linus Torvalds f7f847b015 Revert "x86-64: Disable local APIC timer use on AMD systems with C1E" This reverts commit `e66485d747`, since Rafael Wysocki noticed that the change only works for his in -mm, not in mainline (and that both "noapictimer" _and_ "apicmaintimer" are broken on his hardware, but that's apparently not a regression, just a symptom of the same issue that causes the automatic apic timer disable to not work). It turns out that it really doesn't work correctly on x86-64, since x86-64 doesn't use the generic clock events for timers yet. Thanks to Rafal for testing, and here's the ugly details on x86-64 as per Thomas: "I just looked into the code and the logic vs. noapictimer on SMP is completely broken. On i386 the noapictimer option not only disables the local APIC timer, it also registers the CPUs for broadcasting via IPI on SMP systems. The x86-64 code uses the broadcast only when the local apic timer is active, i.e. "noapictimer" is not on the command line. This defeats the whole purpose of "noapictimer". It should be there to make boxen work, where the local APIC timer actually has a hardware problem, e.g. the nx6325. The current implementation of x86_64 only fixes the ACPI c-states related problem where the APIC timer stops in C3(2), nothing else. On nx6325 and other AMD X2 equipped systems which have the C1E enabled we run into the following: PIT keeps jiffies (and the system) running, but the local APIC timer interrupts can get out of sync due to this C1E effect. I don't think this is a critical problem, but it is wrong nevertheless. I think it's safe to revert the C1E patch and postpone the fix to the clock events conversion." On further reflection, Thomas noted: "It's even worse than I thought on the first check: "noapictimer" on the command line of an SMP box prevents _ONLY_ the boot CPU apic timer from being used. But the secondary CPU is still unconditionally setting up the APIC timer and uses the non calibrated variable calibration_result, which is of course 0, to setup the APIC timer. Wreckage guaranteed." so we'll just have to wait for the x86 merge to hopefully fix this up for x86-64. Tested-and-requested-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		18 years ago
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acpi	[acpi] Correct the decoding of video mode numbers in wakeup.S	18 years ago
cpufreq	[CPUFREQ] the overdue removal of X86_SPEEDSTEP_CENTRINO_ACPI	18 years ago
Makefile	revert "x86, serial: convert legacy COM ports to platform devices"	18 years ago
aperture.c	x86_64: arch/x86_64/kernel/aperture.c lower printk severity	18 years ago
apic.c	x86_64: fix HPET init race	18 years ago
asm-offsets.c	…
audit.c	[PATCH] audit signal recipients	18 years ago
bugs.c	x86_64: include asm/bugs.h in bugs.c for check_bugs prototype	18 years ago
crash.c	…
crash_dump.c	…
e820.c	x86_64: arch/x86_64/kernel/e820.c lower printk severity	18 years ago
early-quirks.c	x86_64: move iommu declaration from proto to iommu.h	18 years ago
early_printk.c	xen: use the hvc console infrastructure for Xen console	18 years ago
entry.S	remove unused TIF_NOTIFY_RESUME flag	18 years ago
genapic.c	…
genapic_flat.c	…
head.S	x86_64: Change PMDS invocation to single macro	18 years ago
head64.c	x86_64: display more intuitive error message if kernel is not 2MB aligned	18 years ago
hpet.c	x86_64: fix section mismatch warning in hpet.c	18 years ago
i387.c	…
i8259.c	x86_64: Move functions declarations to header file	18 years ago
init_task.c	use the new percpu interface for shared data	18 years ago
io_apic.c	ACPI: boot correctly with "nosmp" or "maxcpus=0"	18 years ago
ioport.c	header cleaning: don't include smp_lock.h when not used	18 years ago
irq.c	x86_64 irq: use mask/unmask and proper locking in fixup_irqs()	18 years ago
k8.c	Avoid zero size allocation in cache_k8_northbridges()	18 years ago
kprobes.c	x86: Fix alternatives and kprobes to remap write-protected kernel text	18 years ago
ldt.c	header cleaning: don't include smp_lock.h when not used	18 years ago
machine_kexec.c	…
mce.c	x86: Stop MCEs and NMIs during code patching	18 years ago
mce_amd.c	x86_64: Fix APIC typo	18 years ago
mce_intel.c	…
module.c	…
mpparse.c	x86_64: remove unused variable maxcpus	18 years ago
nmi.c	x86_64: Fix to keep watchdog disabled by default for i386/x86_64	18 years ago
pci-calgary.c	x86_64: Calgary - Fix mis-handled PCI topology	18 years ago
pci-dma.c	x86_64: Fail dma_alloc_coherent on dma less devices	18 years ago
pci-gart.c	x86_64: move iommu declaration from proto to iommu.h	18 years ago
pci-nommu.c	x86_64: move iommu declaration from proto to iommu.h	18 years ago
pci-swiotlb.c	x86_64: move iommu declaration from proto to iommu.h	18 years ago
pmtimer.c	…
process.c	Revert "x86_64: Quicklist support for x86_64"	18 years ago
ptrace.c	x86_64: Zero extend all registers after ptrace in 32bit entry path.	18 years ago
reboot.c	x86_64: move iommu declaration from proto to iommu.h	18 years ago
relocate_kernel.S	…
setup.c	Revert "x86-64: Disable local APIC timer use on AMD systems with C1E"	18 years ago
setup64.c	x86_64: Ignore compat mode SYSCALL when IA32_EMULATION is not defined	18 years ago
signal.c	x86: i386-show-unhandled-signals-v3	18 years ago
smp.c	Revert "x86_64: Quicklist support for x86_64"	18 years ago
smpboot.c	header cleaning: don't include smp_lock.h when not used	18 years ago
stacktrace.c	…
suspend.c	Replace CONFIG_SOFTWARE_SUSPEND with CONFIG_HIBERNATION	18 years ago
suspend_asm.S	…
sys_x86_64.c	Remove fs.h from mm.h	18 years ago
syscall.c	…
tce.c	x86-64: Calgary: fix section mismatch warnings in tce	18 years ago
time.c	x86_64: use the global PIT lock	18 years ago
trampoline.S	…
traps.c	x86: i386-show-unhandled-signals-v3	18 years ago
tsc.c	x86_64: cleanup tsc.c merge artifact	18 years ago
tsc_sync.c	…
verify_cpu.S	Unify the CPU features vectors between i386 and x86-64	18 years ago
vmlinux.lds.S	x86_64: Squash initial_code modpost warnings	18 years ago
vsmp.c	…
vsyscall.c	x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu	18 years ago
x8664_ksyms.c	…