linux/drivers/mmc
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
..
at91_mci.c Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2006-12-07 15:40:39 -08:00
au1xmmc.c mmc: constify mmc_host_ops vectors 2006-12-01 17:58:53 +01:00
au1xmmc.h Au1[12]00 mmc driver. Only tested on the Au1200 at this point though 2005-10-29 19:32:26 +01:00
imxmmc.c mmc: constify mmc_host_ops vectors 2006-12-01 17:58:53 +01:00
imxmmc.h [ARM] 3457/1: i.MX: SD/MMC support for i.MX/MX1 2006-04-02 19:27:07 +01:00
Kconfig Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2006-12-07 15:40:39 -08:00
Makefile [ARM] 3963/1: AT91: Update configuration files 2006-12-01 16:56:43 +00:00
mmc_block.c mmc: correct request error handling 2006-12-01 19:06:19 +01:00
mmc_queue.c Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/drzeus/mmc 2006-12-02 08:29:04 -08:00
mmc_queue.h mmc: remove kernel_thread() 2006-12-01 17:56:46 +01:00
mmc_sysfs.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2006-12-05 14:37:56 +00:00
mmc.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2006-12-05 14:37:56 +00:00
mmc.h WorkStruct: make allyesconfig 2006-11-22 14:57:56 +00:00
mmci.c mmc: constify mmc_host_ops vectors 2006-12-01 17:58:53 +01:00
mmci.h [MMC] mmci: kunmap_atomic() unmaps virtual address, not page 2006-01-05 10:31:23 +00:00
omap.c Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/drzeus/mmc 2006-12-02 08:29:04 -08:00
pxamci.c mmc: constify mmc_host_ops vectors 2006-12-01 17:58:53 +01:00
pxamci.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sdhci.c mmc: sdhci high speed support 2006-12-01 18:54:10 +01:00
sdhci.h mmc: sdhci high speed support 2006-12-01 18:54:10 +01:00
tifm_sd.c [PATCH] LOG2: Implement a general integer log2 facility in the kernel 2006-12-08 08:28:51 -08:00
wbsd.c Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/drzeus/mmc 2006-12-02 08:29:04 -08:00
wbsd.h [PATCH] mmc (mainly): add "or later" clause to licence statement. 2006-10-01 00:39:23 -07:00