f0d1b0b30d
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>
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|---|---|---|
| .. | ||
| at91_mci.c | ||
| au1xmmc.c | ||
| au1xmmc.h | ||
| imxmmc.c | ||
| imxmmc.h | ||
| Kconfig | ||
| Makefile | ||
| mmc_block.c | ||
| mmc_queue.c | ||
| mmc_queue.h | ||
| mmc_sysfs.c | ||
| mmc.c | ||
| mmc.h | ||
| mmci.c | ||
| mmci.h | ||
| omap.c | ||
| pxamci.c | ||
| pxamci.h | ||
| sdhci.c | ||
| sdhci.h | ||
| tifm_sd.c | ||
| wbsd.c | ||
| wbsd.h | ||