[RFC 1/3] add macros for new sparse features

[Johannes Berg <johannes@sipsolutions.net>]

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This patch adds kernel macros for a few new sparse features, namely
 * checking try_lock functions and
 * making a function or macro require a certain lock.

Still waiting to see what the sparse folks say to my patches.

Not-yet-signed-off-by: Johannes Berg <johannes@sipsolutions.net>
---
 include/linux/compiler.h |    6 ++++++
 1 file changed, 6 insertions(+)

--- everything.orig/include/linux/compiler.h	2008-04-10 15:36:18.000000000 +0200
+++ everything/include/linux/compiler.h	2008-04-10 15:36:40.000000000 +0200
@@ -11,9 +11,12 @@
 # define __nocast	__attribute__((nocast))
 # define __iomem	__attribute__((noderef, address_space(2)))
 # define __acquires(x)	__attribute__((context(x,0,1)))
+# define __try_acquires(x,t,f)	__attribute__((conditional_context(x,0,t,f)))
 # define __releases(x)	__attribute__((context(x,1,0)))
 # define __acquire(x)	__context__(x,1)
 # define __release(x)	__context__(x,-1)
+# define __requires(x)	__attribute__((context(x,1,1)))
+# define __macro_requires(x)	__context__(x,0,1)
 # define __cond_lock(x,c)	((c) ? ({ __acquire(x); 1; }) : 0)
 extern void __chk_user_ptr(const volatile void __user *);
 extern void __chk_io_ptr(const volatile void __iomem *);
@@ -28,9 +31,12 @@ extern void __chk_io_ptr(const volatile 
 # define __chk_io_ptr(x) (void)0
 # define __builtin_warning(x, y...) (1)
 # define __acquires(x)
+# define __try_acquires(x,t,f)
 # define __releases(x)
 # define __acquire(x) (void)0
 # define __release(x) (void)0
+# define __requires(x)
+# define __macro_requires(x)
 # define __cond_lock(x,c) (c)
 #endif
 

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