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42c059e04d
linux/include/asm-i386
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Chuck Ebbert 42c059e04d [PATCH] i386 spinlocks: disable interrupts only if we enabled them 
_raw_spin_lock_flags() is entered with interrupts disabled.  If it cannot
obtain a spinlock, it checks the flags that were passed and re-enables
interrupts before spinning if that's how the flags are set.  When the
spinlock might be available, it disables interrupts (even if they are
already disabled) before trying to get the lock.  Change that so interrupts
are only disabled if they have been enabled.  This costs nine bytes of
duplicated spinloop code.

Fastpath before patch:
        jle <keep looping>      not-taken conditional jump
        cli                     disable interrupts
        jmp <try for lock>      unconditional jump

Fastpath after patch, if interrupts were not enabled:
        jg <try for lock>       taken conditional branch

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 07:38:06 -08:00
..
mach-bigsmp [PATCH] x86: convert bigsmp to use flat physical mode 2006-01-06 08:33:37 -08:00
mach-default [PATCH] i386: fix uses of user_mode() vs. user_mode_vm() 2006-03-23 07:38:05 -08:00
mach-es7000 [PATCH] Compilation fix for ES7000 when no ACPI is specified in config (i386) 2006-03-23 07:38:04 -08:00
mach-generic [PATCH] x86: sutomatically enable bigsmp when we have more than 8 CPUs 2005-09-05 00:06:10 -07:00
mach-numaq [PATCH] Do not enforce unique IO_APIC_ID check for xAPIC systems (i386) 2005-06-23 09:45:09 -07:00
mach-summit [PATCH] USB: Always do usb-handoff 2005-10-28 16:47:49 -07:00
mach-visws [PATCH] i386: fix uses of user_mode() vs. user_mode_vm() 2006-03-23 07:38:05 -08:00
mach-voyager [PATCH] i386: fix uses of user_mode() vs. user_mode_vm() 2006-03-23 07:38:05 -08:00
8253pit.h
a.out.h
acpi.h [PATCH] don't call check_acpi_pci() on x86 with ACPI disabled 2006-03-22 07:53:54 -08:00
agp.h [PATCH] i386: inline asm cleanup 2005-09-05 00:06:11 -07:00
alternative.h [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
apic.h [PATCH] i386: port ATI timer fix from x86_64 to i386 II 2006-03-08 18:10:31 -08:00
apicdef.h [PATCH] x86: sutomatically enable bigsmp when we have more than 8 CPUs 2005-09-05 00:06:10 -07:00
arch_hooks.h [PATCH] x86: early printk handling fixes 2006-03-23 07:38:05 -08:00
atomic.h [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
auxvec.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
bitops.h [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
boot.h
bug.h
bugs.h [PATCH] i386: move SIMD initialization 2006-01-06 08:33:34 -08:00
byteorder.h
cache.h [PATCH] Kill L1_CACHE_SHIFT_MAX 2006-01-08 20:13:39 -08:00
cacheflush.h [PATCH] x86/x86_64: mark rodata section read only: x86 parts 2006-01-06 08:33:36 -08:00
checksum.h [NET]: Fix ipl=>ihl typo in ip_fast_csum 2005-08-29 16:02:48 -07:00
cpu.h [PATCH] i386 CPU hotplug 2005-06-25 16:24:29 -07:00
cpufeature.h [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
cputime.h
current.h [PATCH] mark several functions __always_inline 2006-01-14 18:27:15 -08:00
debugreg.h
delay.h
desc.h [PATCH] x86: fix broken SMP boot sequence 2006-02-24 14:31:38 -08:00
div64.h [PATCH] include/asm-i386/: "extern inline" -> "static inline" 2005-09-10 10:06:34 -07:00
dma-mapping.h [PATCH] i386: make pci_map_single/pci_map_sg warn for zero length. 2006-01-11 19:04:56 -08:00
dma.h
e820.h
edac.h [PATCH] EDAC: core EDAC support code 2006-01-18 19:20:31 -08:00
elf.h [PATCH] fix remaining missing includes 2005-11-07 07:53:41 -08:00
emergency-restart.h [PATCH] i386: Implement machine_emergency_reboot 2005-07-26 14:35:42 -07:00
errno.h
fcntl.h [PATCH] Clean up struct flock64 definitions 2005-09-07 16:57:38 -07:00
fixmap.h [ACPI] delete CONFIG_ACPI_BOOT 2005-08-24 12:08:54 -04:00
floppy.h
futex.h [PATCH] uml: remove leftover from patch revertal 2006-01-18 19:20:20 -08:00
genapic.h [PATCH] Do not enforce unique IO_APIC_ID check for xAPIC systems (i386) 2005-06-23 09:45:09 -07:00
hardirq.h
highmem.h [PATCH] kdump: Routines for copying dump pages 2005-06-25 16:24:53 -07:00
hpet.h
hw_irq.h Revert "i386: move apic init in init_IRQs" 2005-10-31 19:16:17 -08:00
i387.h [PATCH] i386: task_thread_info() 2006-01-12 09:08:51 -08:00
i8253.h [PATCH] x86: i8253/i8259A lock cleanup 2005-06-30 08:45:10 -07:00
i8259.h
ide.h [PATCH] ide: explain the PCI bus test we do in <asm-i386/ide.h> 2005-11-10 00:10:37 +01:00
io_apic.h [ACPI] delete CONFIG_ACPI_BOOT 2005-08-24 12:08:54 -04:00
io.h [PATCH] x86_64: Generalize DMI and enable for x86-64 2006-01-11 19:04:51 -08:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h
ipc.h
ipcbuf.h
irq.h [PATCH] Make vm86 support optional 2006-01-08 20:14:11 -08:00
ist.h
kdebug.h [PATCH] x86 NMI: better support for debuggers 2005-09-05 00:06:13 -07:00
kexec.h [PATCH] Kdump: i386 compiler warning fix 2006-01-10 08:01:27 -08:00
kmap_types.h
kprobes.h [PATCH] Kprobes causes NX protection fault on i686 SMP 2006-02-24 14:31:37 -08:00
ldt.h
linkage.h
local.h
math_emu.h
mc146818rtc.h
mca_dma.h
mca.h
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mmu_context.h
mmu.h
mmx.h
mmzone.h [PATCH] mm: kvaddr_to_nid not used in common code 2006-01-06 08:33:23 -08:00
module.h [PATCH] Base support for AMD Geode GX/LX processors 2006-01-06 08:33:38 -08:00
mpspec_def.h [PATCH] mpspec: remove unneeded packed attribute 2006-01-06 08:33:39 -08:00
mpspec.h [PATCH] i386: remove duplicate declaration of mp_bus_id_to_pci_bus 2006-03-23 07:38:04 -08:00
msgbuf.h
msi.h [PATCH] PCI: Change MSI to use physical delivery mode always 2005-11-10 16:09:18 -08:00
msr.h [PATCH] x86: more asm cleanups 2005-09-05 00:06:12 -07:00
mtrr.h [PATCH] Fix the imlicit declaration of mtrr_centaur_report_mcr in arch/i386/kernel/cpu/centaur.c 2006-03-23 07:38:06 -08:00
mutex.h [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
namei.h
nmi.h
node.h
numa.h [PATCH] x86-64: Use ACPI PXM to parse PCI<->node assignments 2005-09-12 10:49:57 -07:00
numaq.h
numnodes.h
page.h [PATCH] VMSPLIT config options 2006-02-01 08:53:21 -08:00
param.h [PATCH] Avoid namespace pollution in <asm/param.h> 2006-01-02 08:38:38 -08:00
parport.h
pci-direct.h
pci.h Revert PCIBIOS_MIN_IO changes for 2.6.13 2005-08-14 18:21:30 -07:00
percpu.h
pgalloc.h
pgtable-2level-defs.h
pgtable-2level.h [PATCH] i386: actively synchronize vmalloc area when registering certain callbacks 2006-03-23 07:38:05 -08:00
pgtable-3level-defs.h
pgtable-3level.h [PATCH] i386: actively synchronize vmalloc area when registering certain callbacks 2006-03-23 07:38:05 -08:00
pgtable.h [PATCH] Enable mprotect on huge pages 2006-03-22 07:54:03 -08:00
poll.h
posix_types.h
processor.h [PATCH] i386: task_stack_page() 2006-01-12 09:08:52 -08:00
ptrace.h [PATCH] PTRACE_SYSEMU is only for i386 and clashes with other ptrace codes of other archs 2006-01-08 20:14:04 -08:00
resource.h
rtc.h
rwlock.h [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
rwsem.h [PATCH] add sem_is_read/write_locked() 2005-10-29 21:40:35 -07:00
scatterlist.h
seccomp.h
sections.h
segment.h [PATCH] x86: Pnp segments in segment h 2006-01-06 08:33:34 -08:00
semaphore.h [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
sembuf.h
serial.h [PATCH] Serial: Split 8250 port table (part 2) 2005-06-29 18:45:19 +01:00
setup.h [PATCH] x86: fix EFI memory map parsing 2005-09-05 00:06:09 -07:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h [PATCH] Handle TIF_RESTORE_SIGMASK for i386 2006-01-18 19:20:29 -08:00
smp.h [PATCH] PCI: Change MSI to use physical delivery mode always 2005-11-10 16:09:18 -08:00
socket.h [NET]: Introduce SO_{SND,RCV}BUFFORCE socket options 2005-08-29 15:31:35 -07:00
sockios.h
sparsemem.h [PATCH] sparsemem memory model for i386 2005-06-23 09:45:05 -07:00
spinlock_types.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
spinlock.h [PATCH] i386 spinlocks: disable interrupts only if we enabled them 2006-03-23 07:38:06 -08:00
srat.h
stat.h
statfs.h
string.h [PATCH] mark several functions __always_inline 2006-01-14 18:27:15 -08:00
suspend.h
system.h [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
termbits.h
termios.h
thread_info.h [PATCH] i386: fix singlestepping though a syscall 2006-02-17 08:55:21 -08:00
timer.h [PATCH] add suspend/resume for timer 2005-09-05 00:06:18 -07:00
timex.h [PATCH] x86: cpu_khz type fix 2005-06-23 09:45:11 -07:00
tlb.h
tlbflush.h [PATCH] seccomp: tsc disable 2005-06-27 15:11:44 -07:00
topology.h [PATCH] fix x86 topology export in sysfs for subarchitectures 2006-02-14 16:09:34 -08:00
types.h [PATCH] sab: consolidate kmem_bufctl_t 2005-09-05 00:05:48 -07:00
uaccess.h [PATCH] i386: Add a temporary to make put_user more type safe 2006-03-23 07:38:04 -08:00
ucontext.h
unaligned.h
unistd.h [PATCH] fstatat64 support 2006-02-11 21:41:10 -08:00
user.h
vga.h
vic.h
vm86.h [PATCH] Make vm86 support optional 2006-01-08 20:14:11 -08:00
voyager.h
xor.h [PATCH] i386: inline asm cleanup 2005-09-05 00:06:11 -07:00