You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

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
..
4xx_io	…
8xx_io	[PATCH] struct path: convert ppc	18 years ago
8260_io	WorkQueue: Fix up arch-specific work items where possible	18 years ago
amiga	…
boot	[POWERPC] Add files build to .gitignore	18 years ago
configs	…
kernel	[PATCH] use generic BUG for ppc	18 years ago
lib	…
mm	…
platforms	…
syslib	…
xmon	…
.gitignore	[POWERPC] Add files build to .gitignore	18 years ago
Kconfig	[PATCH] LOG2: Implement a general integer log2 facility in the kernel	18 years ago
Kconfig.debug	…
Makefile	…