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percpu, module: implement and use is_kernel/module_percpu_address()

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lockdep has custom code to check whether a pointer belongs to static
percpu area which is somewhat broken.  Implement proper
is_kernel/module_percpu_address() and replace the custom code.

On UP, percpu variables are regular static variables and can't be
distinguished from them.  Always return %false on UP.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@redhat.com>
This commit is contained in:
Tejun Heo
2010-03-10 18:57:54 +09:00
parent 259354deaa
commit 10fad5e46f
5 changed files with 77 additions and 16 deletions
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7
include/linux/percpu.h
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@@ -137,6 +137,7 @@ extern int __init pcpu_page_first_chunk(size_t reserved_size,
extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
extern void __percpu *__alloc_percpu(size_t size, size_t align);
extern void free_percpu(void __percpu *__pdata);
extern bool is_kernel_percpu_address(unsigned long addr);
extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
@@ -163,6 +164,12 @@ static inline void free_percpu(void __percpu *p)
kfree(p);
}
/* can't distinguish from other static vars, always false */
static inline bool is_kernel_percpu_address(unsigned long addr)
{
return false;
}
static inline phys_addr_t per_cpu_ptr_to_phys(void *addr)
{
return __pa(addr);