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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>		18 years ago
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Kconfig	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	18 years ago
Makefile	[ARM] 3963/1: AT91: Update configuration files	18 years ago
at91_mci.c	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	18 years ago
au1xmmc.c	mmc: constify mmc_host_ops vectors	18 years ago
au1xmmc.h	Au1[12]00 mmc driver. Only tested on the Au1200 at this point though	19 years ago
imxmmc.c	mmc: constify mmc_host_ops vectors	18 years ago
imxmmc.h	[ARM] 3457/1: i.MX: SD/MMC support for i.MX/MX1	19 years ago
mmc.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	18 years ago
mmc.h	WorkStruct: make allyesconfig	18 years ago
mmc_block.c	mmc: correct request error handling	18 years ago
mmc_queue.c	Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/drzeus/mmc	18 years ago
mmc_queue.h	mmc: remove kernel_thread()	18 years ago
mmc_sysfs.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	18 years ago
mmci.c	mmc: constify mmc_host_ops vectors	18 years ago
mmci.h	[MMC] mmci: kunmap_atomic() unmaps virtual address, not page	19 years ago
omap.c	Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/drzeus/mmc	18 years ago
pxamci.c	mmc: constify mmc_host_ops vectors	18 years ago
pxamci.h	…
sdhci.c	mmc: sdhci high speed support	18 years ago
sdhci.h	mmc: sdhci high speed support	18 years ago
tifm_sd.c	[PATCH] LOG2: Implement a general integer log2 facility in the kernel	18 years ago
wbsd.c	Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/drzeus/mmc	18 years ago
wbsd.h	[PATCH] mmc (mainly): add "or later" clause to licence statement.	19 years ago