svn commit: r363842 - head/sys/compat/linuxkpi/common/include/linux

[Emmanuel Vadot]

Author: manu
Date: Tue Aug  4 15:25:22 2020
New Revision: 363842
URL: https://svnweb.freebsd.org/changeset/base/363842

Log:
  linuxkpi: Add clear_bit_unlock
  
  This calls clear_bit and adds a memory barrier.
  
  Sponsored by: The FreeBSD Foundation
  
  Reviewed by:	hselasky
  MFC after:	1 week
  Differential Revision:	https://reviews.freebsd.org/D25943

Modified:
  head/sys/compat/linuxkpi/common/include/linux/bitops.h

Modified: head/sys/compat/linuxkpi/common/include/linux/bitops.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/bitops.h	Tue Aug  4 15:00:02 2020	(r363841)
+++ head/sys/compat/linuxkpi/common/include/linux/bitops.h	Tue Aug  4 15:25:22 2020	(r363842)
@@ -275,6 +275,13 @@ find_next_zero_bit(const unsigned long *addr, unsigned
 #define	test_bit(i, a)							\
     !!(READ_ONCE(((volatile const unsigned long *)(a))[BIT_WORD(i)]) & BIT_MASK(i))
 
+static inline void
+clear_bit_unlock(long bit, volatile unsigned long *var)
+{
+	clear_bit(bit, var);
+	wmb();
+}
+
 static inline int
 test_and_clear_bit(long bit, volatile unsigned long *var)
 {