Commits · f0d1b0b30d250a07627ad8b9fbbb5c7cc08422e8 · linux / linux-davinci

08 Dec, 2006 40 commits

[PATCH] LOG2: Implement a general integer log2 facility in the kernel · f0d1b0b3

David Howells authored Dec 08, 2006

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>

f0d1b0b3

[PATCH] struct path: convert zorro · b3d7ae5f

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

b3d7ae5f

[PATCH] struct path: convert video · ad9a824e

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

ad9a824e

[PATCH] struct path: convert v4l · 723731b2

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

723731b2

[PATCH] struct path: convert usb · 33cb8994

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

33cb8994

[PATCH] struct path: convert unix · 592ccbf9

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

592ccbf9

[PATCH] struct path: convert ufs · 763454d6

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

763454d6

[PATCH] struct path: convert udf · 5096e933

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5096e933

[PATCH] struct path: convert sysv · 5495ca65

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5495ca65

[PATCH] struct path: convert sunrpc · 303b46bb

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

303b46bb

[PATCH] struct path: convert sparc64 · 1250ca4c

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1250ca4c

[PATCH] struct path: convert sparc · 45e07981

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

45e07981

[PATCH] struct path: convert sound · 7bc56323

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7bc56323

[PATCH] struct path: convert smbfs · 17b75e69

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

17b75e69

[PATCH] struct path: convert sh · c943c4b4

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

c943c4b4

[PATCH] struct path: convert selinux · 3d5ff529

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3d5ff529

[PATCH] struct path: convert scsi · 7ac6207b

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7ac6207b

[PATCH] struct path: convert sbus · 7fa95f72

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7fa95f72

[PATCH] struct path: convert s390 · d20343e7

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

d20343e7

[PATCH] struct path: convert s390-drivers · 49522c97

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

49522c97

[PATCH] struct path: convert romfs · 3027795e

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3027795e

[PATCH] struct path: convert reiserfs · 1fc5adbd

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1fc5adbd

[PATCH] struct path: convert ramfs · a57c4d65

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

a57c4d65

[PATCH] struct path: convert qnx4 · 24e23c24

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

24e23c24

[PATCH] struct path: convert ppc · c2c8bbad

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

c2c8bbad

[PATCH] struct path: convert powerpc · b4d1ab58

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

b4d1ab58

[PATCH] struct path: convert pcmcia · 40fad04b

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

40fad04b

[PATCH] struct path: convert pci · 46cc65a7

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

46cc65a7

[PATCH] struct path: convert parisc · 0c5a5566

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

0c5a5566

[PATCH] struct path: convert oprofile · 1fb1430b

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1fb1430b

[PATCH] struct path: convert openpromfs · 80a06780

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

80a06780

[PATCH] struct path: convert ocfs2 · d28c9174

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

d28c9174

[PATCH] struct path: convert netlink · 6db5fc5d

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

6db5fc5d

[PATCH] struct path: convert netfilter · 6df81ab2

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

6df81ab2

[PATCH] struct path: convert net · 3126a42c

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3126a42c

[PATCH] struct path: convert ncpfs · 92e5baef

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

92e5baef

[PATCH] struct path: convert nbd · 17506041

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

17506041

[PATCH] struct path: convert mm · e9536ae7

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

e9536ae7

[PATCH] struct path: convert mips · 1b04fe9a

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1b04fe9a

[PATCH] struct path: convert minix · dcf258ae

Josef Sipek authored Dec 08, 2006

Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

dcf258ae