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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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4xx_io	[POWERPC] ARCH=ppc pt_regs fixes	19 years ago
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	Remove all inclusions of <linux/config.h>	19 years ago
boot	[POWERPC] Add files build to .gitignore	18 years ago
configs	[POWERPC] update prep_defconfig	19 years ago
kernel	[PATCH] use generic BUG for ppc	18 years ago
lib	Remove obsolete #include <linux/config.h>	19 years ago
mm	[PATCH] mm: use symbolic names instead of indices for zone initialisation	19 years ago
platforms	[POWERPC] Compilation fixes for ppc4xx PCI-less configs	18 years ago
syslib	[POWERPC] 8xx: Off-by-one fixes to SCC parameter RAM definitions	18 years ago
xmon	[POWERPC] PPC: Fix xmon stack frame address in backtrace	19 years ago
.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	Merge branch '85xx' of git://git.kernel.org/pub/scm/linux/kernel/git/galak/powerpc	19 years ago