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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 <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Ingo Molnar <[email protected]>
This commit is contained in:
Tejun Heo 2010-03-10 18:57:54 +09:00
commit 10fad5e46f
5 changed files with 77 additions and 16 deletions
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21
kernel/lockdep.c
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@ -582,9 +582,6 @@ static int static_obj(void *obj)
unsigned long start = (unsigned long) &_stext,
end = (unsigned long) &_end,
addr = (unsigned long) obj;
#ifdef CONFIG_SMP
int i;
#endif
/*
* static variable?
@ -595,24 +592,16 @@ static int static_obj(void *obj)
if (arch_is_kernel_data(addr))
return 1;
#ifdef CONFIG_SMP
/*
* percpu var?
* in-kernel percpu var?
*/
for_each_possible_cpu(i) {
start = (unsigned long) &__per_cpu_start + per_cpu_offset(i);
end = (unsigned long) &__per_cpu_start + PERCPU_ENOUGH_ROOM
+ per_cpu_offset(i);
if ((addr >= start) && (addr < end))
return 1;
}
#endif
if (is_kernel_percpu_address(addr))
return 1;
/*
* module var?
* module static or percpu var?
*/
return is_module_address(addr);
return is_module_address(addr) || is_module_percpu_address(addr);
}
/*