From: Chris Wilson chris@chris-wilson.co.uk
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
--- include/linux/bitops.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- 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);