linux/compiler.h: add __must_hold macro for functions called with a lock held
linux/compiler.h has macros to denote functions that acquire or release locks, but not to denote functions called with a lock held that return with the lock still held. Add a __must_hold macro to cover that case. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Reported-by: Ed Cashin <ecashin@coraid.com> Tested-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -10,6 +10,7 @@
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# define __force __attribute__((force))
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# define __nocast __attribute__((nocast))
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# define __iomem __attribute__((noderef, address_space(2)))
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# define __must_hold(x) __attribute__((context(x,1,1)))
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# define __acquires(x) __attribute__((context(x,0,1)))
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# define __releases(x) __attribute__((context(x,1,0)))
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# define __acquire(x) __context__(x,1)
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@ -33,6 +34,7 @@ extern void __chk_io_ptr(const volatile void __iomem *);
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# define __chk_user_ptr(x) (void)0
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# define __chk_io_ptr(x) (void)0
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# define __builtin_warning(x, y...) (1)
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# define __must_hold(x)
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# define __acquires(x)
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# define __releases(x)
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# define __acquire(x) (void)0
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