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42c059e04d
linux/include
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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
..
acpi [ACPI] ACPICA 20060127 2006-01-31 03:25:09 -05:00
asm-alpha [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-arm Merge master.kernel.org:/home/rmk/linux-2.6-arm 2006-03-22 17:32:09 -08:00
asm-arm26 [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-cris [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-frv [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-generic [PATCH] add EXPORT_SYMBOL_GPL_FUTURE() 2006-03-20 13:42:58 -08:00
asm-h8300 [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-i386 [PATCH] i386 spinlocks: disable interrupts only if we enabled them 2006-03-23 07:38:06 -08:00
asm-ia64 [PATCH] hugepage: is_aligned_hugepage_range() cleanup 2006-03-22 07:54:04 -08:00
asm-m32r [PATCH] m32r: fix and update for gcc-4.0 2006-02-24 14:31:36 -08:00
asm-m68k [PATCH] m68k: fix cmpxchg compile errors if CONFIG_RMW_INSNS=n 2006-03-09 19:47:38 -08:00
asm-m68knommu [PATCH] m68knommu: hardirq.h needs definition of NR_IRQS 2006-02-07 16:16:54 -08:00
asm-mips It's UTF-8 2006-03-22 00:13:35 +01:00
asm-parisc [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-powerpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2006-03-22 22:20:46 -08:00
asm-ppc powerpc: Implement accurate task and CPU time accounting 2006-02-24 14:05:56 +11:00
asm-s390 [PATCH] mm: remove set_pgdir leftovers 2006-03-22 07:53:56 -08:00
asm-sh [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-sh64 [PATCH] mm: remove set_pgdir leftovers 2006-03-22 07:53:56 -08:00
asm-sparc [SPARC]: Respect vm_page_prot in io_remap_page_range(). 2006-03-22 01:15:13 -08:00
asm-sparc64 [SPARC64]: Add a secondary TSB for hugepage mappings. 2006-03-22 01:15:14 -08:00
asm-um [PATCH] x86: SMP alternatives 2006-03-23 07:38:04 -08:00
asm-v850 [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-x86_64 [PATCH] Enable mprotect on huge pages 2006-03-22 07:54:03 -08:00
asm-xtensa [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
keys
linux [PATCH] DM: Fix bug: BIO_RW_BARRIER requests to md/raid1 hang. 2006-03-23 07:38:03 -08:00
math-emu
media V4L/DVB (3513): Remove saa711x driver 2006-03-21 08:53:40 -08:00
mtd
net [NETFILTER]: futher {ip,ip6,arp}_tables unification 2006-03-22 13:56:56 -08:00
pcmcia [PATCH] pcmcia: Add macro to match PCMCIA cards by numeric ID and first vendor string 2006-03-01 11:11:26 +01:00
rdma IB/umad: Add support for large RMPP transfers 2006-03-20 10:08:23 -08:00
rxrpc
scsi Merge ../linux-2.6 2006-03-21 13:05:45 -06:00
sound [ALSA] version 1.0.11rc4 2006-03-22 14:37:15 +01:00
video [PATCH] neofb: avoid resetting display config on unblank (v2) 2006-02-15 15:32:21 -08:00