70 lines
2.1 KiB
Diff
70 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andi Kleen <ak@linux.intel.com>
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Date: Fri, 13 Oct 2017 14:56:41 -0700
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Subject: [PATCH] bitops: Add clear/set_bit32() to linux/bitops.h
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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Add two simple wrappers around set_bit/clear_bit() that accept
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the common case of an u32 array. This avoids writing
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casts in all callers.
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Signed-off-by: Andi Kleen <ak@linux.intel.com>
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Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Link: http://lkml.kernel.org/r/20171013215645.23166-2-andi@firstfloor.org
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit cbe96375025e14fc76f9ed42ee5225120d7210f8)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit 06d31c11519ca0e8f9b7cab857f442ef44dfc1b2)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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include/linux/bitops.h | 26 ++++++++++++++++++++++++++
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1 file changed, 26 insertions(+)
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diff --git a/include/linux/bitops.h b/include/linux/bitops.h
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index a83c822c35c2..eb257a96db6d 100644
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--- a/include/linux/bitops.h
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+++ b/include/linux/bitops.h
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@@ -226,6 +226,32 @@ static inline unsigned long __ffs64(u64 word)
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return __ffs((unsigned long)word);
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}
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+/*
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+ * clear_bit32 - Clear a bit in memory for u32 array
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+ * @nr: Bit to clear
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+ * @addr: u32 * address of bitmap
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+ *
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+ * Same as clear_bit, but avoids needing casts for u32 arrays.
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+ */
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+
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+static __always_inline void clear_bit32(long nr, volatile u32 *addr)
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+{
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+ clear_bit(nr, (volatile unsigned long *)addr);
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+}
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+
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+/*
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+ * set_bit32 - Set a bit in memory for u32 array
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+ * @nr: Bit to clear
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+ * @addr: u32 * address of bitmap
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+ *
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+ * Same as set_bit, but avoids needing casts for u32 arrays.
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+ */
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+
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+static __always_inline void set_bit32(long nr, volatile u32 *addr)
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+{
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+ set_bit(nr, (volatile unsigned long *)addr);
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+}
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+
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#ifdef __KERNEL__
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#ifndef set_mask_bits
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--
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2.14.2
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