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authorTejun Heo <tj@kernel.org>2010-03-10 12:57:54 +0300
committerTejun Heo <tj@kernel.org>2010-03-29 18:07:12 +0400
commit10fad5e46f6c7bdfb01b1a012380a38e3c6ab346 (patch)
tree9ec6e3955e7f879f64ea79812cf5ecd41baa6939 /include
parent259354deaaf03d49a02dbb9975d6ec2a54675672 (diff)
downloadlinux-10fad5e46f6c7bdfb01b1a012380a38e3c6ab346.tar.xz
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 'include')
-rw-r--r--include/linux/module.h1
-rw-r--r--include/linux/percpu.h7
2 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/module.h b/include/linux/module.h
index 87d247ac6761..f0e2659f4e3e 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -395,6 +395,7 @@ static inline int module_is_live(struct module *mod)
struct module *__module_text_address(unsigned long addr);
struct module *__module_address(unsigned long addr);
bool is_module_address(unsigned long addr);
+bool is_module_percpu_address(unsigned long addr);
bool is_module_text_address(unsigned long addr);
static inline int within_module_core(unsigned long addr, struct module *mod)
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index a93e5bfdccb8..11d5f834b54a 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -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);