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SubjectRe: [RESEND PATCH v2 3/9] asm-generic: Move some macros from linux/bitops.h to a new bits.h file
On Tue, 19 Jun 2018 13:53:08 +0100 Will Deacon <will.deacon@arm.com> wrote:

> In preparation for implementing the asm-generic atomic bitops in terms
> of atomic_long_*, we need to prevent asm/atomic.h implementations from
> pulling in linux/bitops.h. A common reason for this include is for the
> BITS_PER_BYTE definition, so move this and some other BIT() and masking
> macros into a new header file, linux/bits.h
>
> --- a/include/linux/bitops.h
> +++ b/include/linux/bitops.h
> @@ -2,29 +2,9 @@
> #ifndef _LINUX_BITOPS_H
> #define _LINUX_BITOPS_H
> #include <asm/types.h>
> +#include <linux/bits.h>
>
> -#ifdef __KERNEL__
> -#define BIT(nr) (1UL << (nr))
> -#define BIT_ULL(nr) (1ULL << (nr))
> -#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
> -#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
> -#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
> -#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
> -#define BITS_PER_BYTE 8
> #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
> -#endif

Why does it leave BITS_TO_LONGS() in place?

That becomes unfortunate with Chris's patch, so I'm moving
BITS_TO_LONGS() into bits.h.


From: Chris Wilson <chris@chris-wilson.co.uk>
Subject: 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>
---

include/linux/bitops.h | 3 ++-
include/linux/net_dim.h | 1 -
2 files changed, 2 insertions(+), 2 deletions(-)

diff -puN include/linux/bitops.h~bitops-introduce-bits_per_type include/linux/bitops.h
--- a/include/linux/bitops.h~bitops-introduce-bits_per_type
+++ a/include/linux/bitops.h
@@ -11,7 +11,8 @@
#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
#define BITS_PER_BYTE 8
-#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))
#endif

/*
diff -puN include/linux/net_dim.h~bitops-introduce-bits_per_type include/linux/net_dim.h
--- a/include/linux/net_dim.h~bitops-introduce-bits_per_type
+++ a/include/linux/net_dim.h
@@ -363,7 +363,6 @@ static inline void net_dim_sample(u16 ev
}

#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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