diff mbox series

[v3,04/11] mips: Add clear_bit_unlock_is_negative_byte implementation

Message ID 20200416220130.13343-5-willy@infradead.org (mailing list archive)
State RFC
Headers show
Series Make PageWriteback use the PageLocked optimisation | expand

Commit Message

Matthew Wilcox (Oracle) April 16, 2020, 10:01 p.m. UTC 
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

This is the generic implementation.  I can't figure out an optimised
implementation for mips.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@vger.kernel.org
---
 arch/mips/include/asm/bitops.h | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/arch/mips/include/asm/bitops.h b/arch/mips/include/asm/bitops.h
index a74769940fbd..23e9d36c2ffc 100644
--- a/arch/mips/include/asm/bitops.h
+++ b/arch/mips/include/asm/bitops.h
@@ -147,6 +147,13 @@  static inline void clear_bit_unlock(unsigned long nr, volatile unsigned long *ad
 	clear_bit(nr, addr);
 }
 
+static inline bool clear_bit_unlock_is_negative_byte(unsigned int nr,
+						volatile unsigned long *p)
+{
+	clear_bit_unlock(nr, p);
+	return test_bit(7, p);
+}
+
 /*
  * change_bit - Toggle a bit in memory
  * @nr: Bit to change