linux-kernel - [tip:x86/fpu] bitops: Add clear/set

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Message-ID: <tip-cbe96375025e14fc76f9ed42ee5225120d7210f8@git.kernel.org>
Date:   Tue, 17 Oct 2017 09:21:46 -0700
From:   tip-bot for Andi Kleen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, hpa@...or.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        ak@...ux.intel.com, torvalds@...ux-foundation.org
Subject: [tip:x86/fpu] bitops: Add clear/set_bit32() to linux/bitops.h

Commit-ID:  cbe96375025e14fc76f9ed42ee5225120d7210f8
Gitweb:     https://git.kernel.org/tip/cbe96375025e14fc76f9ed42ee5225120d7210f8
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Fri, 13 Oct 2017 14:56:41 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 17 Oct 2017 17:14:56 +0200

bitops: Add clear/set_bit32() to linux/bitops.h

Add two simple wrappers around set_bit/clear_bit() that accept
the common case of an u32 array. This avoids writing
casts in all callers.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20171013215645.23166-2-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/bitops.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 8fbe259..36794f0 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -227,6 +227,32 @@ static inline unsigned long __ffs64(u64 word)
 	return __ffs((unsigned long)word);
 }
 
+/*
+ * clear_bit32 - Clear a bit in memory for u32 array
+ * @nr: Bit to clear
+ * @addr: u32 * address of bitmap
+ *
+ * Same as clear_bit, but avoids needing casts for u32 arrays.
+ */
+
+static __always_inline void clear_bit32(long nr, volatile u32 *addr)
+{
+	clear_bit(nr, (volatile unsigned long *)addr);
+}
+
+/*
+ * set_bit32 - Set a bit in memory for u32 array
+ * @nr: Bit to clear
+ * @addr: u32 * address of bitmap
+ *
+ * Same as set_bit, but avoids needing casts for u32 arrays.
+ */
+
+static __always_inline void set_bit32(long nr, volatile u32 *addr)
+{
+	set_bit(nr, (volatile unsigned long *)addr);
+}
+
 #ifdef __KERNEL__
 
 #ifndef set_mask_bits