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| author | Robert P. J. Day <rpjday@mindspring.com> | 2007-01-30 06:06:00 -0500 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-02-07 14:03:19 +1100 |
| commit | 63c2f782e8f6aafbc11b14b2cb291b3dc9fc217d (patch) | |
| tree | cbcd1f138a886529ec62a21c5dd4b2c87581058d /arch/ppc/mm | |
| parent | 7df2457db83bc922fcc8b462526b77f1ffe8c84b (diff) | |
| download | linux-3.10-63c2f782e8f6aafbc11b14b2cb291b3dc9fc217d.tar.gz linux-3.10-63c2f782e8f6aafbc11b14b2cb291b3dc9fc217d.tar.bz2 linux-3.10-63c2f782e8f6aafbc11b14b2cb291b3dc9fc217d.zip | |
[POWERPC] Add "is_power_of_2" checking to log2.h.
Add the inline function "is_power_of_2()" to log2.h, where the value
zero is *not* considered to be a power of two.
Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc/mm')
| -rw-r--r-- | arch/ppc/mm/pgtable.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/ppc/mm/pgtable.c b/arch/ppc/mm/pgtable.c index 354a9408f02..82b06a1ef95 100644 --- a/arch/ppc/mm/pgtable.c +++ b/arch/ppc/mm/pgtable.c @@ -313,11 +313,8 @@ void __init mapin_ram(void) } } -/* is x a power of 2? */ -#define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0)) - /* is x a power of 4? */ -#define is_power_of_4(x) ((x) != 0 && (((x) & (x-1)) == 0) && (ffs(x) & 1)) +#define is_power_of_4(x) is_power_of_2(x) && (ffs(x) & 1)) /* * Set up a mapping for a block of I/O. |