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percpu: make accessors check for percpu pointer in sparse

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The previous patch made sparse warn about percpu variables being used
directly without going through percpu accessors.  This patch
implements the other half - checking whether non percpu variable is
passed into percpu accessors.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Tejun Heo
2009-10-29 22:34:15 +09:00
parent e0fdb0e050
commit 545695fb41
3 changed files with 24 additions and 4 deletions
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6
include/asm-generic/percpu.h
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@@ -42,8 +42,10 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
*/
#ifndef SHIFT_PERCPU_PTR
/* Weird cast keeps both GCC and sparse happy. */
#define SHIFT_PERCPU_PTR(__p, __offset) \
RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset))
#define SHIFT_PERCPU_PTR(__p, __offset) ({ \
__verify_pcpu_ptr((__p)); \
RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)); \
})
#endif
/*