linux-kernel - [PATCH 4.9 39/88] include/linux/bitops.h: introduce BITS_PER

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Message-Id: <20200310123615.448719347@linuxfoundation.org>
Date:   Tue, 10 Mar 2020 13:38:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>,
        Jani Nikula <jani.nikula@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andy Gospodarek <gospo@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.9 39/88] include/linux/bitops.h: introduce BITS_PER_TYPE

From: Chris Wilson <chris@...is-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@...is-wilson.co.uk>
Reviewed-by: Jani Nikula <jani.nikula@...el.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Andy Gospodarek <gospo@...adcom.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[only take the bitops.h portion for stable kernels - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/bitops.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -3,7 +3,8 @@
 #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);