Commit 9144d75e authored Aug 21, 2018 by Chris Wilson Committed by Linus Torvalds Aug 22, 2018

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>

parent ccf7a6d4

include/linux/bitops.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -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);

include/linux/net_dim.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -363,7 +363,6 @@ static inline void net_dim_sample(u16 event_ctr,
		}

		#define NET_DIM_NEVENTS 64
		#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
		#define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) & (BIT_ULL(bits) - 1))

		static inline void net_dim_calc_stats(struct net_dim_sample *start,

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