android_kernel_xiaomi_sm8350/drivers/md
David Howells f0d1b0b30d [PATCH] LOG2: Implement a general integer log2 facility in the kernel
This facility provides three entry points:

	ilog2()		Log base 2 of unsigned long
	ilog2_u32()	Log base 2 of u32
	ilog2_u64()	Log base 2 of u64

These facilities can either be used inside functions on dynamic data:

	int do_something(long q)
	{
		...;
		y = ilog2(x)
		...;
	}

Or can be used to statically initialise global variables with constant values:

	unsigned n = ilog2(27);

When performing static initialisation, the compiler will report "error:
initializer element is not constant" if asked to take a log of zero or of
something not reducible to a constant.  They treat negative numbers as
unsigned.

When not dealing with a constant, they fall back to using fls() which permits
them to use arch-specific log calculation instructions - such as BSR on
x86/x86_64 or SCAN on FRV - if available.

[akpm@osdl.org: MMC fix]
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Howells <dhowells@redhat.com>
Cc: Wojtek Kaniewski <wojtekka@toxygen.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 08:28:51 -08:00
..
raid6test
.gitignore
bitmap.c [PATCH] struct path: convert md 2006-12-08 08:28:47 -08:00
dm-bio-list.h
dm-bio-record.h
dm-crypt.c [PATCH] LOG2: Implement a general integer log2 facility in the kernel 2006-12-08 08:28:51 -08:00
dm-emc.c [PATCH] struct path: rename DM's struct path 2006-12-08 08:28:40 -08:00
dm-exception-store.c
dm-hw-handler.c
dm-hw-handler.h [PATCH] struct path: rename DM's struct path 2006-12-08 08:28:40 -08:00
dm-io.c
dm-io.h
dm-ioctl.c [PATCH] dm: fix find_device race 2006-11-08 18:29:23 -08:00
dm-linear.c [PATCH] struct path: convert md 2006-12-08 08:28:47 -08:00
dm-log.c
dm-log.h
dm-mpath.c [PATCH] struct path: convert md 2006-12-08 08:28:47 -08:00
dm-mpath.h [PATCH] struct path: rename DM's struct path 2006-12-08 08:28:40 -08:00
dm-path-selector.c
dm-path-selector.h [PATCH] struct path: rename DM's struct path 2006-12-08 08:28:40 -08:00
dm-raid1.c WorkStruct: make allyesconfig 2006-11-22 14:57:56 +00:00
dm-round-robin.c [PATCH] struct path: rename DM's struct path 2006-12-08 08:28:40 -08:00
dm-snap.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
dm-snap.h
dm-stripe.c
dm-table.c
dm-target.c
dm-zero.c
dm.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
dm.h
faulty.c
Kconfig
kcopyd.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
kcopyd.h
linear.c
Makefile
md.c [PATCH] struct path: convert md 2006-12-08 08:28:47 -08:00
mktables.c
multipath.c
raid0.c
raid1.c
raid5.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
raid6.h
raid6algos.c
raid6altivec.uc
raid6int.uc
raid6mmx.c
raid6recov.c
raid6sse1.c
raid6sse2.c
raid6x86.h
raid10.c
unroll.pl
xor.c