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    Subject[PATCH 4/7] Ksplice: Add module_data_address (the analogue of module_text_address)
    Date
    From: Tim Abbott <tabbott@mit.edu>

    Ksplice's run-pre matching process needs to be able to determine the module
    that contains a particular text or data address.

    Signed-off-by: Tim Abbott <tabbott@mit.edu>
    ---
    include/linux/module.h | 2 ++
    kernel/module.c | 32 ++++++++++++++++++++++++++++++++
    2 files changed, 34 insertions(+), 0 deletions(-)

    diff --git a/include/linux/module.h b/include/linux/module.h
    index 3bfed01..2268147 100644
    --- a/include/linux/module.h
    +++ b/include/linux/module.h
    @@ -366,6 +366,8 @@ static inline int module_is_live(struct module *mod)
    /* Is this address in a module? (second is with no locks, for oops) */
    struct module *module_text_address(unsigned long addr);
    struct module *__module_text_address(unsigned long addr);
    +struct module *module_data_address(unsigned long addr);
    +struct module *__module_data_address(unsigned long addr);
    int is_module_address(unsigned long addr);

    /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
    diff --git a/kernel/module.c b/kernel/module.c
    index 0d361f0..c3cf234 100644
    --- a/kernel/module.c
    +++ b/kernel/module.c
    @@ -2724,6 +2724,7 @@ struct module *__module_text_address(unsigned long addr)
    return mod;
    return NULL;
    }
    +EXPORT_SYMBOL_GPL(__module_text_address);

    struct module *module_text_address(unsigned long addr)
    {
    @@ -2735,6 +2736,37 @@ struct module *module_text_address(unsigned long addr)

    return mod;
    }
    +EXPORT_SYMBOL_GPL(module_text_address);
    +
    +struct module *__module_data_address(unsigned long addr)
    +{
    + struct module *mod;
    +
    + if (addr < module_addr_min || addr > module_addr_max)
    + return NULL;
    +
    + list_for_each_entry(mod, &modules, list) {
    + if (within(addr, mod->module_core + mod->core_text_size,
    + mod->core_size - mod->core_text_size) ||
    + within(addr, mod->module_init + mod->init_text_size,
    + mod->init_size - mod->init_text_size))
    + return mod;
    + }
    + return NULL;
    +}
    +EXPORT_SYMBOL_GPL(__module_data_address);
    +
    +struct module *module_data_address(unsigned long addr)
    +{
    + struct module *mod;
    +
    + preempt_disable();
    + mod = __module_data_address(addr);
    + preempt_enable();
    +
    + return mod;
    +}
    +EXPORT_SYMBOL_GPL(module_data_address);

    /* Don't grab lock, we're oopsing. */
    void print_modules(void)
    --
    1.5.6.3


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