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SubjectRe: [PATCH 1/2] Add for_each_module iterator function


On Wed, 22 Sep 2010, Andi Kleen wrote:

> From: Andi Kleen <ak@linux.intel.com>
>
> This is a generic function to iterate over all modules.
> To be used in the next patch.
>
> Signed-off-by: Andi Kleen <ak@linux.intel.com>
> ---
> include/linux/module.h | 1 +
> kernel/module.c | 10 ++++++++++
> 2 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/module.h b/include/linux/module.h
> index 403ac26..809b6db 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -410,6 +410,7 @@ 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);
> +void for_each_module(void (*op)(struct module *, void *arg), void *arg);
>
> static inline int within_module_core(unsigned long addr, struct module *mod)
> {
> diff --git a/kernel/module.c b/kernel/module.c
> index eba1341..b8fb3e6 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -384,6 +384,16 @@ struct module *find_module(const char *name)
> }
> EXPORT_SYMBOL_GPL(find_module);
>
> +void for_each_module(void (*op)(struct module *, void *arg), void *arg)
> +{
> + struct module *mod;
> +
> + preempt_disable();

That wants rcu_read_lock()

> + list_for_each_entry_rcu(mod, &modules, list)
> + op(mod, arg);
> + preempt_enable();

Thanks,

tglx


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