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Eric Dumazet 15ae02baf0 lib/extable.c: remove an expensive integer divide in search_extable() 
Actual code let compiler generates idiv instruction on x86.

Using a right shift is OK here and readable as well.

Before patch
   10:   57                      push   %edi
   11:   56                      push   %esi
   12:   89 d6                   mov    %edx,%esi
   14:   53                      push   %ebx
   15:   89 c3                   mov    %eax,%ebx
   17:   eb 22                   jmp    3b <search_extable+0x2b>
   19:   89 f0                   mov    %esi,%eax
   1b:   ba 02 00 00 00          mov    $0x2,%edx
   20:   29 d8                   sub    %ebx,%eax
   22:   89 d7                   mov    %edx,%edi
   24:   c1 f8 03                sar    $0x3,%eax
   27:   99                      cltd
   28:   f7 ff                   idiv   %edi
   2a:   8d 04 c3                lea    (%ebx,%eax,8),%eax
   2d:   39 08                   cmp    %ecx,(%eax)
...

After patch

00000010 <search_extable>:
   10:   53                      push   %ebx
   11:   89 c3                   mov    %eax,%ebx
   13:   eb 18                   jmp    2d <search_extable+0x1d>
   15:   89 d0                   mov    %edx,%eax
   17:   29 d8                   sub    %ebx,%eax
   19:   c1 f8 04                sar    $0x4,%eax
   1c:   8d 04 c3                lea    (%ebx,%eax,8),%eax
   1f:   39 08                   cmp    %ecx,(%eax)
...

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06 10:41:08 -08:00
..
lzo
lzo: add some missing casts
2007-07-31 15:39:37 -07:00
reed_solomon
[MTD] [NAND] Replace -1 with -EBADMSG in nand error correction code
2007-10-20 22:30:54 +01:00
zlib_deflate
lib/: Spelling fixes
2008-02-03 17:48:52 +02:00
zlib_inflate
[ZLIB]: Fix external builds of zlib_inflate code.
2007-10-11 22:17:20 -07:00
.gitignore
Add some basic .gitignore files
2005-10-18 08:26:15 -07:00
argv_split.c
LIB: Replace inappropriate include of <linux/bug.h>
2007-10-20 00:26:10 +02:00
audit.c
[PATCH] audit signal recipients
2007-05-11 05:38:25 -04:00
bitmap.c
Fix bitmap_scnlistprintf for empty masks
2007-11-05 15:12:32 -08:00
bitrev.c
[PATCH] add MODULE_* attributes to bit reversal library
2006-12-10 10:07:52 -08:00
bug.c
generic bug: use show_regs() instead of dump_stack()
2007-07-16 09:05:51 -07:00
bust_spinlocks.c
handle recursive calls to bust_spinlocks()
2007-10-17 08:42:56 -07:00
check_signature.c
uninline check_signature()
2007-07-16 09:05:50 -07:00
cmdline.c
[PATCH] Numerous fixes to kernel-doc info in source files.
2007-02-11 10:51:32 -08:00
cpumask.c
Safer nr_node_ids and nr_node_ids determination and initial values
2007-05-07 12:12:51 -07:00
crc7.c
CRC7 support
2007-07-17 10:23:04 -07:00
crc16.c
[PATCH] kernel-doc for lib/crc*.c
2006-06-25 10:01:20 -07:00
crc32.c
lib/: Spelling fixes
2008-02-03 17:48:52 +02:00
crc32defs.h
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
crc-ccitt.c
[PATCH] kernel-doc for lib/crc*.c
2006-06-25 10:01:20 -07:00
crc-itu-t.c
CRC ITU-T V.41
2007-05-10 18:24:13 +02:00
ctype.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
debug_locks.c
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
dec_and_lock.c
[PATCH] atomic: dec_and_lock use atomic primitives
2006-01-08 20:13:48 -08:00
devres.c
iomap: implement pcim_iounmap_regions()
2007-04-28 14:15:58 -04:00
div64.c
[S390]: Fix build on 31-bit.
2007-04-25 22:28:53 -07:00
dump_stack.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
extable.c
lib/extable.c: remove an expensive integer divide in search_extable()
2008-02-06 10:41:08 -08:00
fault-inject.c
fault_inject: silence a warning
2007-07-24 12:24:59 -07:00
find_next_bit.c
ext4: Add ext4_find_next_bit()
2008-01-28 23:58:27 -05:00
gen_crc32table.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
genalloc.c
Slab allocators: Replace explicit zeroing with __GFP_ZERO
2007-07-17 10:23:02 -07:00
halfmd4.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
hexdump.c
hexdump: don't print bytes with bit 7 set
2007-11-29 09:24:53 -08:00
hweight.c
remove asm/bitops.h includes
2007-10-19 11:53:41 -07:00
idr.c
Slab API: remove useless ctor parameter and reorder parameters
2007-10-17 08:42:45 -07:00
inflate.c
[PATCH] x86-64: deflate inflate_dynamic too
2007-05-02 19:27:15 +02:00
int_sqrt.c
[PATCH] lib: Fix bug in int_sqrt() for 64 bit longs
2006-02-03 08:32:08 -08:00
iomap_copy.c
[PATCH] add __iowrite64_copy
2006-06-20 20:24:58 -07:00
iomap.c
lib/iomap.c:bad_io_access(): print 0x hex prefix
2007-10-17 08:42:57 -07:00
iommu-helper.c
iommu sg: add IOMMU helper functions for the free area management
2008-02-05 09:44:11 -08:00
ioremap.c
lib/ioremap.c should #include <linux/io.h>
2007-10-17 08:42:50 -07:00
irq_regs.c
[PATCH] irq_reqs: export __irq_regs
2006-10-06 08:53:40 -07:00
kasprintf.c
lib: move kasprintf to a separate file
2007-07-31 15:39:39 -07:00
Kconfig
Introduce CONFIG_CHECK_SIGNATURE
2007-08-22 19:52:45 -07:00
Kconfig.debug
kbuild: Spelling/grammar fixes for config DEBUG_SECTION_MISMATCH
2008-02-03 08:58:07 +01:00
kernel_lock.c
sched: remove the !PREEMPT_BKL code
2008-01-25 21:08:33 +01:00
klist.c
Driver core: Don't call put methods while holding a spinlock
2006-09-25 21:08:40 -07:00
kobject_uevent.c
Kobject: fix coding style issues in kobject c files
2008-01-24 21:59:04 -08:00
kobject.c
kobject: kerneldoc comment fix
2008-02-02 15:14:48 -08:00
kref.c
kref: add kref_set()
2008-01-24 20:40:05 -08:00
libcrc32c.c
[LIB] crc32c: Keep intermediate crc state in cpu order
2007-11-08 21:34:09 +08:00
list_debug.c
[PATCH] More list debugging context
2006-12-07 08:39:35 -08:00
locking-selftest-hardirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-mutex.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-rlock-hardirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-rlock-softirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-rlock.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-rsem.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-softirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-spin-hardirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-spin-softirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-spin.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-wlock-hardirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-wlock-softirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-wlock.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-wsem.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest.c
[PATCH] lockdep: show more details about self-test failures
2006-12-07 08:39:43 -08:00
Makefile
iommu sg: add IOMMU helper functions for the free area management
2008-02-05 09:44:11 -08:00
parser.c
[AFS]: Make the match_*() functions take const options.
2007-05-03 03:10:39 -07:00
pcounter.c
[LIB] pcounter : unline too big functions
2008-01-28 15:00:35 -08:00
percpu_counter.c
Add irq protection in the percpu-counters cpu-hotplug-callback path
2007-10-19 11:53:44 -07:00
plist.c
[PATCH] pi-futex: add plist implementation
2006-06-27 17:32:46 -07:00
prio_heap.c
Fix cpusets update_cpumask
2007-10-19 11:53:41 -07:00
prio_tree.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
proportions.c
lib: proportion: fix underflow in prop_norm_percpu()
2007-12-23 12:54:37 -08:00
radix-tree.c
radix-tree: avoid atomic allocations for preloaded insertions
2008-02-05 09:44:17 -08:00
random32.c
[PATCH] severing module.h->sched.h
2006-12-04 02:00:22 -05:00
rbtree.c
[PATCH] rbtree: fixed reversed RB_EMPTY_NODE and rb_next/prev
2006-09-30 20:26:56 +02:00
reciprocal_div.c
[PATCH] SLAB: use a multiply instead of a divide in obj_to_index()
2006-12-13 09:05:49 -08:00
rwsem-spinlock.c
Lockdep: add lockdep_set_class_and_subclass() and lockdep_set_subclass()
2006-10-11 01:45:14 -04:00
rwsem.c
x86: fix UML and -regparm=3
2008-01-30 13:33:00 +01:00
scatterlist.c
SG: work with the SCSI fixed maximum allocations.
2008-01-28 10:54:49 +01:00
semaphore-sleepers.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
sha1.c
[PATCH] Numerous fixes to kernel-doc info in source files.
2007-02-11 10:51:32 -08:00
smp_processor_id.c
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
sort.c
lib/sort.c optimization
2007-10-17 08:42:52 -07:00
spinlock_debug.c
Use helpers to obtain task pid in printks
2007-10-19 11:53:43 -07:00
string.c
[STRING]: Move strcasecmp/strncasecmp to lib/string.c
2007-04-26 01:54:39 -07:00
swiotlb.c
iommu sg merging: swiotlb: respect the segment boundary limits
2008-02-05 09:44:12 -08:00
textsearch.c
[TEXTSEARCH]: Do not allow zero length patterns in the textsearch infrastructure
2007-12-01 00:03:52 +11:00
ts_bm.c
[TEXTSEARCH]: Fix Boyer Moore initialization bug
2006-08-22 14:33:58 -07:00
ts_fsm.c
[PATCH] lib/ts_fsm.c: constify structs
2006-09-29 09:18:23 -07:00
ts_kmp.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
vsprintf.c
lib: move kasprintf to a separate file
2007-07-31 15:39:39 -07:00