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dbffa47161
android_kernel_xiaomi_sm8350/arch/i386/kernel
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OGAWA Hirofumi dbffa47161 [PATCH] PM-Timer: don't use workaround if chipset is not buggy 
Current timer_pm.c reads I/O port triple times, in order to avoid the bug
of chipset.  But I/O port is slow.

2.6.16 (pmtmr)
Simple gettimeofday: 3.6532 microseconds

2.6.16+patch (pmtmr)
Simple gettimeofday: 1.4582 microseconds

[if chip is buggy, probably it will be 7us or more in 4.2% of probability.]

This patch adds blacklist of buggy chip, and if chip is not buggy, this
uses fast normal version instead of slow workaround version.

If chip is buggy, warnings "pmtmr is slow".  But sounds like there is gray
zone.  I found the PIIX4 errata, but I couldn't find the ICH4 errata.  But
some motherboard seems to have problem.

So, if we found a ICH4, generate warnings, and use a workaround version.
If user's ICH4 is good, the user can specify the "pmtmr_good" boot
parameter to use fast version.

Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 08:44:37 -08:00
..
acpi [PATCH] EFI: keep physical table addresses in efi structure 2006-03-26 08:56:54 -08:00
cpu [PATCH] sem2mutex: misc static one-file mutexes 2006-03-26 08:56:55 -08:00
timers [PATCH] PM-Timer: don't use workaround if chipset is not buggy 2006-03-27 08:44:37 -08:00
.gitignore [PATCH] x86: gitignore some autogenerated files for i386 2006-02-14 16:09:35 -08:00
alternative.c [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
apic.c [PATCH] fix implicit declaration of GET_APIC_ID in arch/i386/kernel/apic.c 2006-03-23 07:38:06 -08:00
apm.c [PATCH] kill include/linux/platform.h, default_idle() cleanup 2006-03-24 07:33:21 -08:00
asm-offsets.c
bootflag.c
cpuid.c
crash_dump.c [PATCH] kdump: read previous kernel's memory 2006-01-10 08:01:28 -08:00
crash.c [PATCH] i386: fix uses of user_mode() vs. user_mode_vm() 2006-03-23 07:38:05 -08:00
dmi_scan.c [PATCH] EFI fixes 2006-03-26 08:56:54 -08:00
doublefault.c
early_printk.c
efi_stub.S
efi.c [PATCH] fix array overrun in efi.c 2006-03-26 08:56:57 -08:00
entry.S [PATCH] i386: fix singlestep through an int80 syscall 2006-03-23 07:38:05 -08:00
head.S [PATCH] i386: cleanup after cpu_gdt_descr conversion to per-cpu data 2006-03-23 07:38:06 -08:00
i386_ksyms.c [PATCH] x86: fix broken SMP boot sequence 2006-02-24 14:31:38 -08:00
i387.c
i8237.c
i8259.c
init_task.c [PATCH] Change maxaligned_in_smp alignemnt macros to internodealigned_in_smp macros 2006-01-08 20:13:38 -08:00
io_apic.c [PATCH] more for_each_cpu() conversions 2006-03-23 07:38:17 -08:00
ioport.c [PATCH] capable/capability.h (arch/) 2006-01-11 18:42:14 -08:00
irq.c [PATCH] Change maxaligned_in_smp alignemnt macros to internodealigned_in_smp macros 2006-01-08 20:13:38 -08:00
kprobes.c [PATCH] kprobes: fix broken fault handling for i386 2006-03-26 08:57:04 -08:00
ldt.c
machine_kexec.c [PATCH] fix kexec asm 2006-03-08 14:15:04 -08:00
Makefile [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
mca.c
microcode.c [PATCH] sem2mutex: misc static one-file mutexes 2006-03-26 08:56:55 -08:00
module.c [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
mpparse.c [PATCH] x86: deterine xapic using apic version 2006-03-23 07:38:06 -08:00
msr.c
nmi.c [PATCH] more for_each_cpu() conversions 2006-03-23 07:38:17 -08:00
numaq.c
pci-dma.c
process.c [PATCH] kretprobe instance recycled by parent process 2006-03-26 08:57:04 -08:00
ptrace.c [PATCH] i386: Don't let ptrace set the nested task bit 2006-03-23 07:38:04 -08:00
quirks.c [PATCH] EDAC: core EDAC support code 2006-01-18 19:20:31 -08:00
reboot_fixups.c
reboot.c [PATCH] i386/x86-64: Don't IPI to offline cpus on shutdown 2006-01-11 19:04:50 -08:00
relocate_kernel.S
scx200.c [PATCH] arch: Replace pci_module_init() with pci_register_driver() 2006-01-09 12:13:21 -08:00
semaphore.c [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
setup.c [PATCH] EFI fixes 2006-03-26 08:56:54 -08:00
sigframe.h
signal.c [PATCH] swsusp: finally solve mysqld problem 2006-03-23 07:38:08 -08:00
smp.c [PATCH] on_each_cpu(): disable local interrupts 2006-03-22 07:53:59 -08:00
smpboot.c [PATCH] Check if cpu can be onlined before calling smp_prepare_cpu() 2006-03-25 08:23:01 -08:00
srat.c
summit.c
sys_i386.c [PATCH] Uninline sys_mmap common code (reduce binary size) 2006-03-22 07:54:02 -08:00
syscall_table.S [PATCH] fstatat64 support 2006-02-11 21:41:10 -08:00
sysenter.c
time_hpet.c [PATCH] move rtc_interrupt() prototype to rtc.h 2006-01-08 20:13:47 -08:00
time.c [PATCH] x86: fix potential jiffies overflow in timer_resume() 2006-03-06 18:40:44 -08:00
topology.c [PATCH] x86 topology: don;t create a control file for BSP that cannot be removed 2006-03-23 07:38:07 -08:00
trampoline.S
traps.c [PATCH] i386: pass proper trap numbers to die chain handlers 2006-03-26 08:56:53 -08:00
vm86.c [PATCH] make vm86 call audit_syscall_exit 2006-03-20 14:08:53 -05:00
vmlinux.lds.S Merge master.kernel.org:/pub/scm/linux/kernel/git/sam/kbuild 2006-03-25 08:48:48 -08:00
vsyscall-int80.S
vsyscall-note.S
vsyscall-sigreturn.S
vsyscall-sysenter.S [PATCH] i386: more vsyscall documentation 2006-03-23 07:38:06 -08:00
vsyscall.lds.S
vsyscall.S