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author | Tejun Heo <tj@kernel.org> | 2010-03-10 18:57:54 +0900 |
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committer | Tejun Heo <tj@kernel.org> | 2010-03-29 23:07:12 +0900 |
commit | 10fad5e46f6c7bdfb01b1a012380a38e3c6ab346 (patch) | |
tree | 9ec6e3955e7f879f64ea79812cf5ecd41baa6939 /kernel/module.c | |
parent | 259354deaaf03d49a02dbb9975d6ec2a54675672 (diff) | |
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percpu, module: implement and use is_kernel/module_percpu_address()
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>
Diffstat (limited to 'kernel/module.c')
-rw-r--r-- | kernel/module.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/kernel/module.c b/kernel/module.c index e7a6e53..9f8d23d 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -415,6 +415,40 @@ static void percpu_modcopy(struct module *mod, memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); } +/** + * is_module_percpu_address - test whether address is from module static percpu + * @addr: address to test + * + * Test whether @addr belongs to module static percpu area. + * + * RETURNS: + * %true if @addr is from module static percpu area + */ +bool is_module_percpu_address(unsigned long addr) +{ + struct module *mod; + unsigned int cpu; + + preempt_disable(); + + list_for_each_entry_rcu(mod, &modules, list) { + if (!mod->percpu_size) + continue; + for_each_possible_cpu(cpu) { + void *start = per_cpu_ptr(mod->percpu, cpu); + + if ((void *)addr >= start && + (void *)addr < start + mod->percpu_size) { + preempt_enable(); + return true; + } + } + } + + preempt_enable(); + return false; +} + #else /* ... !CONFIG_SMP */ static inline void __percpu *mod_percpu(struct module *mod) @@ -441,6 +475,10 @@ static inline void percpu_modcopy(struct module *mod, /* pcpusec should be 0, and size of that section should be 0. */ BUG_ON(size != 0); } +bool is_module_percpu_address(unsigned long addr) +{ + return false; +} #endif /* CONFIG_SMP */ |