On Wed, Nov 11, 2015 at 10:29:01AM -0600, Chris J Arges wrote: > The following directory structure will allow for cases when the same > function name exists in a single object. > /sys/kernel/livepatch/<patch>/<object>/<function,number> > > The number corresponds to the nth occurrence of the symbol name in > kallsyms for the patched object. > > An example of patching multiple symbols can be found here: > https://github.com/dynup/kpatch/issues/493 Instead of 'function,number' here and everywhere else, maybe 'function,sympos' would be a little clearer. Also, s/old_name/function/ in the patch subject to be consistent. > Signed-off-by: Chris J Arges <chris.j.arges@xxxxxxxxxxxxx> > --- > Documentation/ABI/testing/sysfs-kernel-livepatch | 6 +++++- > kernel/livepatch/core.c | 10 ++++++++-- > 2 files changed, 13 insertions(+), 3 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-kernel-livepatch b/Documentation/ABI/testing/sysfs-kernel-livepatch > index 5bf42a8..21b6bc1 100644 > --- a/Documentation/ABI/testing/sysfs-kernel-livepatch > +++ b/Documentation/ABI/testing/sysfs-kernel-livepatch > @@ -33,7 +33,7 @@ Description: > The object directory contains subdirectories for each function > that is patched within the object. > > -What: /sys/kernel/livepatch/<patch>/<object>/<function> > +What: /sys/kernel/livepatch/<patch>/<object>/<function,number> > Date: Nov 2014 > KernelVersion: 3.19.0 > Contact: live-patching@xxxxxxxxxxxxxxx > @@ -41,4 +41,8 @@ Description: > The function directory contains attributes regarding the > properties and state of the patched function. > > + The directory name contains the patched function name and a > + number corresponding to the nth occurrence of the symbol name > + in kallsyms for the patched object. > + > There are currently no such attributes. > diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c > index 4eb8691..ed2cbbf 100644 > --- a/kernel/livepatch/core.c > +++ b/kernel/livepatch/core.c > @@ -542,7 +542,7 @@ EXPORT_SYMBOL_GPL(klp_enable_patch); > * /sys/kernel/livepatch/<patch> > * /sys/kernel/livepatch/<patch>/enabled > * /sys/kernel/livepatch/<patch>/<object> > - * /sys/kernel/livepatch/<patch>/<object>/<func> > + * /sys/kernel/livepatch/<patch>/<object>/<func,number> > */ > > static ssize_t enabled_store(struct kobject *kobj, struct kobj_attribute *attr, > @@ -687,8 +687,14 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func) > INIT_LIST_HEAD(&func->stack_node); > func->state = KLP_DISABLED; > > + /* The format for the sysfs directory is <func,number> where number is > + * the occurrence of this symbol in kallsyms. If the user selects 0 for ... of this symbol in kallsyms *for the patched object*. > + * old_sympos, then 1 will be used since a unique symbol will be the > + * first occurrence. > + */ > return kobject_init_and_add(&func->kobj, &klp_ktype_func, > - &obj->kobj, "%s", func->old_name); > + &obj->kobj, "%s,%lu", func->old_name, > + func->old_sympos ? func->old_sympos : 1); > } > > /* parts of the initialization that is done only when the object is loaded */ > -- > 1.9.1 -- Josh -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
