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authorChris Wilson <chris@chris-wilson.co.uk>2018-08-22 07:57:03 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-22 20:52:48 +0300
commit9144d75e22cad3c89e6b2ccab551db9ee28d250a (patch)
treeb0fe7660f14d1d4630c2be77d55c373abc4aa77c /include/linux/bitops.h
parentccf7a6d457a8bd618c77468c38842b3f9d82cef4 (diff)
downloadlinux-9144d75e22cad3c89e6b2ccab551db9ee28d250a.tar.xz
include/linux/bitops.h: introduce BITS_PER_TYPE
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>
Diffstat (limited to 'include/linux/bitops.h')
-rw-r--r--include/linux/bitops.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index af419012d77d..7ddb1349394d 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);