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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-08-22 07:57:03 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-11 20:02:52 +0300 |
| commit | 04fb39b7539f2df050efd4972e9f7fe675489f48 (patch) | |
| tree | b6eaa3d7403491b2bffe3feffc301d7ee483f630 /include | |
| parent | 35dc93efe51eae9abc7a031d33f139768d685e02 (diff) | |
| download | linux-04fb39b7539f2df050efd4972e9f7fe675489f48.tar.xz | |
include/linux/bitops.h: introduce BITS_PER_TYPE
commit 9144d75e22cad3c89e6b2ccab551db9ee28d250a upstream.
net_dim.h has a rather useful extension to BITS_PER_BYTE to compute the
number of bits in a type (BITS_PER_BYTE * sizeof(T)), so promote the macro
to bitops.h, alongside BITS_PER_BYTE, for wider usage.
Link: http://lkml.kernel.org/r/20180706094458.14116-1-chris@chris-wilson.co.uk
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Andy Gospodarek <gospo@broadcom.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[only take the bitops.h portion for stable kernels - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bitops.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/bitops.h b/include/linux/bitops.h index b767c7ad65c6..c51574fab0b0 100644 --- a/include/linux/bitops.h +++ b/include/linux/bitops.h @@ -4,7 +4,8 @@ #include <asm/types.h> #include <linux/bits.h> -#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) +#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE) +#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(long)) extern unsigned int __sw_hweight8(unsigned int w); extern unsigned int __sw_hweight16(unsigned int w); |