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Andy Lutomirski 3729db5ca2 x86-64: Don't generate cmov in vread_tsc 
vread_tsc checks whether rdtsc returns something less than
cycle_last, which is an extremely predictable branch.  GCC likes
to generate a cmov anyway, which is several cycles slower than
a predicted branch.  This saves a couple of nanoseconds.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Borislav Petkov <bp@amd64.org>
Link: http://lkml.kernel.org/r/%3C561280649519de41352fcb620684dfb22bad6bac.1306156808.git.luto%40mit.edu%3E
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-05-24 14:51:28 +02:00
..
acpi
x86, ioapic: Consolidate mp_ioapics[] into 'struct ioapic'
2011-05-20 13:40:59 +02:00
apic
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-05-23 12:54:15 -07:00
cpu
x86: setup_smep needs to be __cpuinit
2011-05-22 21:44:13 -07:00
.gitignore
…
alternative.c
Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-05-19 17:55:12 -07:00
amd_gart_64.c
x86, gart: Rename pci-gart_64.c to amd_gart_64.c
2011-05-10 17:22:06 +02:00
amd_iommu_init.c
x86/amd-iommu: Use threaded interupt handler
2011-05-10 11:07:58 +02:00
amd_iommu.c
x86: Eliminate various 'set but not used' warnings
2011-05-21 19:10:33 +02:00
amd_nb.c
x86, amd-nb: Rename CPU PCI id define for F4
2011-03-31 08:51:38 +02:00
apb_timer.c
Merge branch 'consolidate-clksrc-i8253' of master.kernel.org:~rmk/linux-2.6-arm into timers/clocksource
2011-05-14 12:06:36 +02:00
aperture_64.c
x86, gart: Don't enforce GART aperture lower-bound by alignment
2011-04-18 10:31:38 -07:00
apm_32.c
PM: Remove sysdev suspend, resume and shutdown operations
2011-05-11 21:37:15 +02:00
asm-offsets_32.c
x86: Partly unify asm-offsets_{32,64}.c
2011-02-10 13:31:37 +01:00
asm-offsets_64.c
x86: Partly unify asm-offsets_{32,64}.c
2011-02-10 13:31:37 +01:00
asm-offsets.c
x86, asm: Cleanup unnecssary macros in asm-offsets.c
2011-02-25 16:37:32 -08:00
audit_64.c
…
bootflag.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
check.c
x86: Don't check for BIOS corruption in first 64K when there's no need to
2011-03-09 16:36:41 +01:00
cpuid.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
crash_dump_32.c
crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn
2011-03-23 19:47:19 -07:00
crash_dump_64.c
crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn
2011-03-23 19:47:19 -07:00
crash.c
x86, UV: Make kdump avoid stack dumps
2010-07-21 11:33:27 -07:00
devicetree.c
x86, ioapic: Consolidate gsi routing info into 'struct ioapic'
2011-05-20 13:41:01 +02:00
doublefault_32.c
x86: Use get_desc_base()
2009-07-19 18:27:51 +02:00
dumpstack_32.c
x86, dumpstack: Correct stack dump info when frame pointer is available
2011-03-18 10:51:42 +01:00
dumpstack_64.c
x86, dumpstack: Correct stack dump info when frame pointer is available
2011-03-18 10:51:42 +01:00
dumpstack.c
Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
2011-05-19 18:24:11 -07:00
e820.c
crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn
2011-03-23 19:47:19 -07:00
early_printk.c
x86, earlyprintk: Move mrst early console to platform/ and fix a typo
2010-12-06 20:52:04 +01:00
early-quirks.c
x86, quirk: Fix SB600 revision check
2011-03-16 14:03:32 +01:00
entry_32.S
Merge branch 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-16 10:10:02 -07:00
entry_64.S
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
ftrace.c
x86, cpu: Clean up and unify the NOP selection infrastructure
2011-04-18 16:40:21 -07:00
head32.c
Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-05-19 18:08:06 -07:00
head64.c
x86: Cleanup highmap after brk is concluded
2011-03-19 11:58:19 -07:00
head_32.S
Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-15 20:01:36 -07:00
head_64.S
x86, trampoline: Common infrastructure for low memory trampolines
2011-02-17 21:02:43 -08:00
head.c
x86: Use memblock to replace early_res
2010-08-27 11:12:29 -07:00
hpet.c
x86: hpet: Cleanup the clockevents init and register code
2011-05-19 14:24:16 +02:00
hw_breakpoint.c
x86: Use this_cpu_ops to optimize code
2010-12-30 12:20:28 +01:00
i386_ksyms_32.c
x86: Don't generate cmpxchg8b_emu if CONFIG_X86_CMPXCHG64=y
2009-10-01 08:42:24 +02:00
i387.c
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
i8237.c
x86: Use syscore_ops instead of sysdev classes and sysdevs
2011-03-23 22:15:54 +01:00
i8253.c
x86: Convert PIT to clockevents_config_and_register()
2011-05-19 14:24:16 +02:00
i8259.c
x86: Use syscore_ops instead of sysdev classes and sysdevs
2011-03-23 22:15:54 +01:00
init_task.c
Rename .data.cacheline_aligned to .data..cacheline_aligned.
2010-03-03 11:25:58 +01:00
io_delay.c
…
ioport.c
x86: Use bitmap library functions
2011-02-17 14:59:22 +01:00
irq_32.c
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
irq_64.c
x86: Unify fixup_irqs() for 32-bit and 64-bit kernels
2009-11-02 15:56:34 +01:00
irq_work.c
irq_work: Add generic hardirq context callbacks
2010-10-18 19:58:50 +02:00
irq.c
x86: Don't unmask disabled irqs when migrating them
2011-05-19 14:51:08 +02:00
irqinit.c
Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-15 20:01:36 -07:00
jump_label.c
x86, cpu: Clean up and unify the NOP selection infrastructure
2011-04-18 16:40:21 -07:00
kdebugfs.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
kgdb.c
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb
2011-03-25 21:04:56 -07:00
kprobes.c
kprobes, x86: Disable irqs during optimized callback
2011-05-11 13:21:23 +02:00
kvm.c
KVM guest: Fix section mismatch derived from kvm_guest_cpu_online()
2011-03-17 13:08:25 -03:00
kvmclock.c
x86: Convert remaining x86 clocksources to clocksource_register_hz/khz
2011-02-21 13:33:33 -08:00
ldt.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
machine_kexec_32.c
Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-12-08 13:27:33 -08:00
machine_kexec_64.c
x86, cleanups: Use clear_page/copy_page rather than memset/memcpy
2010-09-22 15:36:49 -07:00
Makefile
Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-05-19 18:08:06 -07:00
mca_32.c
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
microcode_amd.c
x86, microcode, AMD: Fix signedness bug in generic_load_microcode()
2011-02-20 14:01:32 +01:00
microcode_core.c
x86, microcode: Unregister syscore_ops after microcode unloaded
2011-03-29 11:12:04 +02:00
microcode_intel.c
x86/microcode: Fix double vfree() and remove redundant pointer checks before vfree()
2010-12-27 14:33:30 +01:00
mmconf-fam10h_64.c
x86-64: Fix and clean up AMD Fam10 MMCONF enabling
2010-11-18 13:41:35 +01:00
module.c
jump label: Introduce static_branch() interface
2011-04-04 12:48:08 -04:00
mpparse.c
x86, ioapic: Consolidate mp_ioapics[] into 'struct ioapic'
2011-05-20 13:40:59 +02:00
msr.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
paravirt_patch_32.c
…
paravirt_patch_64.c
…
paravirt-spinlocks.c
locking: Convert __raw_spin* functions to arch_spin*
2009-12-14 23:55:32 +01:00
paravirt.c
thp: add pmd paravirt ops
2011-01-13 17:32:39 -08:00
pci-calgary_64.c
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
pci-dma.c
x86/PCI: Remove dma32_reserve_bootmem
2011-05-10 15:43:32 -07:00
pci-iommu_table.c
arch/x86/kernel/pci-iommu_table.c: Convert sprintf_symbol to %pS
2011-05-10 10:21:35 +02:00
pci-nommu.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
pci-swiotlb.c
x86, swiotlb: Make SWIOTLB use IOMMU_INIT_* macros.
2010-08-26 15:13:37 -07:00
pcspeaker.c
…
probe_roms.c
x86: Introduce pci_map_biosrom()
2011-03-15 15:34:15 -07:00
process_32.c
cpuidle/x86/perf: fix power:cpu_idle double end events and throw cpu_idle events from the cpuidle layer
2011-01-12 18:05:16 -05:00
process_64.c
x86: mark associated mm when running a task in 32 bit compatibility mode
2011-03-23 16:36:53 -04:00
process.c
x86: A fast way to check capabilities of the current cpu
2011-03-29 10:18:30 +02:00
ptrace.c
x86, hw_breakpoints: Fix racy access to ptrace breakpoints
2011-04-25 17:32:40 +02:00
pvclock.c
x86/pvclock: Zero last_value on resume
2010-11-28 09:33:20 +01:00
quirks.c
x86: HPET force enable for CX700 / VIA Epia LT
2010-09-15 16:27:04 +02:00
reboot_32.S
x86, reboot: Fix relocations in reboot_32.S
2011-05-02 14:44:46 -07:00
reboot_fixups_32.c
x86: Ce4100: Add reboot_fixup() for CE4100
2010-11-12 00:45:41 +01:00
reboot.c
x86: Reorder reboot method preferences
2011-04-06 10:36:50 +02:00
relocate_kernel_32.S
…
relocate_kernel_64.S
…
resource.c
x86: avoid high BIOS area when allocating address space
2010-12-17 10:01:30 -08:00
rtc.c
rtc: cmos: Add OF bindings
2011-02-23 22:27:55 +01:00
setup_percpu.c
x86: Unify CPU -> NUMA node mapping between 32 and 64bit
2011-01-28 14:54:09 +01:00
setup.c
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
2011-05-23 15:39:34 -07:00
signal.c
x86: signal: sys_rt_sigreturn() should use set_current_blocked()
2011-04-28 13:01:38 +02:00
smp.c
sched: Provide scheduler_ipi() callback in response to smp_send_reschedule()
2011-04-14 08:52:32 +02:00
smpboot.c
Revert "x86, NUMA: Fix fakenuma boot failure"
2011-04-21 11:30:59 +02:00
stacktrace.c
x86: Remove warning and warning_symbol from struct stacktrace_ops
2011-05-12 15:31:28 +02:00
step.c
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
sys_i386_32.c
i386: Make kernel_execve() suitable for stack unwinding
2010-09-03 08:16:02 +02:00
sys_x86_64.c
improve sys_newuname() for compat architectures
2010-03-12 15:52:32 -08:00
syscall_64.c
…
syscall_table_32.S
net: Add sendmmsg socket system call
2011-05-05 11:10:14 -07:00
tboot.c
thp: pte alloc trans splitting
2011-01-13 17:32:40 -08:00
tce_64.c
…
test_nx.c
x86: Eliminate various 'set but not used' warnings
2011-05-21 19:10:33 +02:00
test_rodata.c
…
time.c
x86-64: Clean up vdso/kernel shared variables
2011-05-24 14:51:28 +02:00
tls.c
…
tls.h
…
topology.c
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
trampoline_32.S
x86, trampoline: Common infrastructure for low memory trampolines
2011-02-17 21:02:43 -08:00
trampoline_64.S
x86-64, trampoline: Remove unused variable
2011-02-18 15:50:36 -08:00
trampoline.c
x86, trampoline: Common infrastructure for low memory trampolines
2011-02-17 21:02:43 -08:00
traps.c
x86, NMI: Clean-up default_do_nmi()
2011-01-07 15:08:53 +01:00
tsc_sync.c
locking: Convert __raw_spin* functions to arch_spin*
2009-12-14 23:55:32 +01:00
tsc.c
x86-64: Don't generate cmov in vread_tsc
2011-05-24 14:51:28 +02:00
verify_cpu.S
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
vm86_32.c
thp: split_huge_page_mm/vma
2011-01-13 17:32:41 -08:00
vmlinux.lds.S
x86-64: Clean up vdso/kernel shared variables
2011-05-24 14:51:28 +02:00
vsmp_64.c
…
vsyscall_64.c
x86-64: Clean up vdso/kernel shared variables
2011-05-24 14:51:28 +02:00
x86_init.c
Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-05-19 18:08:06 -07:00
x8664_ksyms_64.c
x86-64, mem: Convert memmove() to assembly file and fix return value bug
2011-01-25 16:58:39 -08:00
xsave.c
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00