Anton Blanchard e269b08517 iommu: inline iommu_num_pages ... A profile of a network benchmark showed iommu_num_pages rather high up: 0.52% iommu_num_pages Looking at the profile, an integer divide is taking almost all of the time: % : c000000000376ea4 <.iommu_num_pages>: 1.93 : c000000000376ea4: fb e1 ff f8 std r31,-8(r1) 0.00 : c000000000376ea8: f8 21 ff c1 stdu r1,-64(r1) 0.00 : c000000000376eac: 7c 3f 0b 78 mr r31,r1 3.86 : c000000000376eb0: 38 84 ff ff addi r4,r4,-1 0.00 : c000000000376eb4: 38 05 ff ff addi r0,r5,-1 0.00 : c000000000376eb8: 7c 84 2a 14 add r4,r4,r5 46.95 : c000000000376ebc: 7c 00 18 38 and r0,r0,r3 45.66 : c000000000376ec0: 7c 84 02 14 add r4,r4,r0 0.00 : c000000000376ec4: 7c 64 2b 92 divdu r3,r4,r5 0.00 : c000000000376ec8: 38 3f 00 40 addi r1,r31,64 0.00 : c000000000376ecc: eb e1 ff f8 ld r31,-8(r1) 1.61 : c000000000376ed0: 4e 80 00 20 blr Since every caller of iommu_num_pages passes in a constant power of two we can inline this such that the divide is replaced by a shift. The entire function is only a few instructions once optimised, so it is a good candidate for inlining overall. Signed-off-by: Anton Blanchard <anton@samba.org> Cc: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-08-09 20:45:05 -07:00
..
lzo	lib: add support for LZO-compressed kernels	2010-01-11 09:34:04 -08:00
reed_solomon	lib: Remove unnecessary inclusions of asm/semaphore.h	2008-04-18 22:17:17 -04:00
zlib_deflate
zlib_inflate	inflate_fast: sout is already a short so ptr arith was off by one.	2010-03-12 15:52:44 -08:00
.gitignore
argv_split.c	tree-wide: convert open calls to remove spaces to skip_spaces() lib function	2009-12-15 08:53:32 -08:00
atomic64_test.c	ARM: 6213/1: atomic64_test: add ARM as supported architecture	2010-07-27 10:43:46 +01:00
atomic64.c	lib: Fix atomic64_add_unless return value convention	2010-03-01 11:38:46 -08:00
audit.c
bcd.c
bitmap.c	Revert "cpusets: randomize node rotor used in cpuset_mem_spread_node()"	2010-05-30 09:00:03 -07:00
bitrev.c
btree.c	lib/btree: fix possible NULL pointer dereference	2010-05-15 12:48:10 -07:00
bug.c	panic: Allow warnings to set different taint flags	2010-05-19 08:36:48 +01:00
bust_spinlocks.c
check_signature.c
checksum.c
cmdline.c
cpu-notifier-error-inject.c	fault-injection: add CPU notifier error injection module	2010-05-27 09:12:48 -07:00
cpumask.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
crc7.c
crc16.c
crc32.c	revert "crc32: use __BYTE_ORDER macro for endian detection"	2010-05-26 08:19:23 -07:00
crc32defs.h
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
ctype.c
debug_locks.c	rcu: Introduce lockdep-based checking to RCU read-side primitives	2010-02-25 09:40:59 +01:00
debugobjects.c	Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-05-18 08:17:58 -07:00
dec_and_lock.c
decompress_bunzip2.c	bzip2: Add missing checks for malloc returning NULL	2009-12-15 14:04:19 -08:00
decompress_inflate.c
decompress_unlzma.c
decompress_unlzo.c	lib: fix the use of LZO to decompress initramfs images	2010-04-24 11:31:25 -07:00
decompress.c	Add LZO compression support for initramfs and old-style initrd	2010-01-11 09:34:05 -08:00
devres.c	lib/devres.c: fix comment typo	2010-07-11 22:16:32 +02:00
div64.c
dma-debug.c	dma-debug: Cleanup for copy-loop in filter_write()	2010-04-07 14:36:27 +02:00
dump_stack.c
dynamic_debug.c	module: initialize module dynamic debug later	2010-07-04 20:17:22 -07:00
extable.c
fault-inject.c
find_last_bit.c
find_next_bit.c
flex_array.c	flex_array: fix the panic when calling flex_array_alloc() without __GFP_ZERO	2010-04-24 11:31:24 -07:00
gcd.c
gen_crc32table.c	crc32: major optimization	2010-05-25 08:07:06 -07:00
genalloc.c	genalloc: fix allocation from end of pool	2010-06-29 15:29:30 -07:00
halfmd4.c
hexdump.c	lib: introduce common method to convert hex digits	2010-05-25 08:07:05 -07:00
hweight.c	x86: Add optimized popcnt variants	2010-04-06 15:52:11 -07:00
idr.c	idr: fix RCU lockdep splat in idr_get_next()	2010-06-23 06:50:45 -07:00
inflate.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
int_sqrt.c
iomap_copy.c
iomap.c
iommu-helper.c	iommu: inline iommu_num_pages	2010-08-09 20:45:05 -07:00
ioremap.c	x86, ioremap: Fix incorrect physical address handling in PAE mode	2010-07-09 11:42:03 -07:00
irq_regs.c
is_single_threaded.c
kasprintf.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
Kconfig	lmb: rename to memblock	2010-07-14 17:14:00 +10:00
Kconfig.debug	Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6	2010-08-06 11:36:30 -07:00
Kconfig.kgdb	mips,kgdb: kdb low level trap catch and stack trace	2010-05-20 21:04:26 -05:00
Kconfig.kmemcheck
kernel_lock.c
klist.c
kobject_uevent.c	kobject: free memory if netlink_kernel_create() fails	2010-06-04 13:27:52 -07:00
kobject.c	sysfs: Comment sysfs directory tagging logic	2010-05-21 09:37:31 -07:00
kref.c	kref: remove kref_set	2010-05-21 09:37:29 -07:00
lcm.c	block: Fix overrun in lcm() and move it to lib	2010-03-15 12:47:59 +01:00
libcrc32c.c
list_debug.c
list_sort.c	lib: revise list_sort() header comment	2010-03-06 11:26:35 -08:00
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wlock.h
locking-selftest-wsem.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest.c
lru_cache.c
Makefile	lmb: rename to memblock	2010-07-14 17:14:00 +10:00
nlattr.c
parser.c	parser: remove unnecessary strlen()	2009-12-15 08:53:33 -08:00
percpu_counter.c	tmpfs: add accurate compare function to percpu_counter library	2010-08-09 20:44:58 -07:00
plist.c
prio_heap.c
prio_tree.c
proportions.c
radix-tree.c	radix-tree: omplement function radix_tree_range_tag_if_tagged	2010-08-09 20:44:59 -07:00
random32.c	Merge branch 'master' into for-next	2010-06-16 18:08:13 +02:00
ratelimit.c	ratelimit: fix the return value when __ratelimit() fails to acquire the lock	2010-04-07 08:38:04 -07:00
rational.c	lib/rational.c needs module.h	2010-01-11 09:34:05 -08:00
rbtree.c	rbtree: Undo augmented trees performance damage and regression	2010-07-05 14:43:50 +02:00
reciprocal_div.c
rwsem-spinlock.c	rwsem generic spinlock: use IRQ save/restore spinlocks	2010-04-07 16:15:05 -07:00
rwsem.c	rwsem: Test for no active locks in __rwsem_do_wake undo code	2010-05-12 18:23:34 -07:00
scatterlist.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
sha1.c
show_mem.c	mm: use the same log level for show_mem()	2010-03-06 11:26:27 -08:00
smp_processor_id.c
sort.c
spinlock_debug.c
string_helpers.c
string.c	lib/string.c: simplify strnstr()	2010-03-06 11:26:35 -08:00
swiotlb.c	swiotlb: Make swiotlb bookkeeping functions visible in the header file.	2010-06-07 11:59:27 -04:00
syscall.c
textsearch.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
ts_bm.c
ts_fsm.c
ts_kmp.c
uuid.c	Unified UUID/GUID definition	2010-05-19 22:40:47 -04:00
vsprintf.c	vsprintf: Recursive vsnprintf: Add "%pV", struct va_format	2010-07-04 10:40:17 -07:00