kmemcheck: introduce bitfield API (fc7d0c9f) · Commits · 戴 / test

include/linux/kmemcheck.h

+50 −0

Original line number	Diff line number	Diff line
		@@ -33,6 +33,7 @@ void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n);

		int kmemcheck_show_addr(unsigned long address);
		int kmemcheck_hide_addr(unsigned long address);

		#else
		#define kmemcheck_enabled 0

		@@ -100,4 +101,53 @@ static inline void kmemcheck_mark_initialized_pages(struct page *p,

		#endif /* CONFIG_KMEMCHECK */

		/*
		* Bitfield annotations
		*
		* How to use: If you have a struct using bitfields, for example
		*
		* struct a {
		* int x:8, y:8;
		* };
		*
		* then this should be rewritten as
		*
		* struct a {
		* kmemcheck_bitfield_begin(flags);
		* int x:8, y:8;
		* kmemcheck_bitfield_end(flags);
		* };
		*
		* Now the "flags_begin" and "flags_end" members may be used to refer to the
		* beginning and end, respectively, of the bitfield (and things like
		* &x.flags_begin is allowed). As soon as the struct is allocated, the bit-
		* fields should be annotated:
		*
		* struct a *a = kmalloc(sizeof(struct a), GFP_KERNEL);
		* kmemcheck_annotate_bitfield(a, flags);
		*
		* Note: We provide the same definitions for both kmemcheck and non-
		* kmemcheck kernels. This makes it harder to introduce accidental errors. It
		* is also allowed to pass NULL pointers to kmemcheck_annotate_bitfield().
		*/
		#define kmemcheck_bitfield_begin(name) \
		int name##_begin[0];

		#define kmemcheck_bitfield_end(name) \
		int name##_end[0];

		#define kmemcheck_annotate_bitfield(ptr, name) \
		do if (ptr) { \
		int _n = (long) &((ptr)->name##_end) \
		- (long) &((ptr)->name##_begin); \
		BUILD_BUG_ON(_n < 0); \
		\
		kmemcheck_mark_initialized(&((ptr)->name##_begin), _n); \
		} while (0)

		#define kmemcheck_annotate_variable(var) \
		do { \
		kmemcheck_mark_initialized(&(var), sizeof(var)); \
		} while (0) \

		#endif /* LINUX_KMEMCHECK_H */

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