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kmod/core: update a few comments

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- update the file description comment to be a little more accurate and
  concise
- s/trampoline/ftrace handler/
This commit is contained in:
Josh Poimboeuf 2014-05-01 12:35:10 -05:00
parent b5de5a8b25
commit 411fd570f2
1 changed files with 11 additions and 11 deletions
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22
kmod/core/core.c
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@ -16,19 +16,19 @@
* along with this program; if not, see <http://www.gnu.org/licenses/>. * along with this program; if not, see <http://www.gnu.org/licenses/>.
*/ */
/* Contains the code for the core kpatch module. Each patch module registers /*
* with this module to redirect old functions to new functions. * kpatch core module
* *
* Each patch module can contain one or more new functions. This information * Patch modules register with this module to redirect old functions to new
* is contained in the .patches section of the patch module. For each function * functions.
* patched by the module we must: *
* For each function patched by the module we must:
* - Call stop_machine * - Call stop_machine
* - Ensure that no execution thread is currently in the old function (or has * - Ensure that no task has the old function in its call stack
* it in the call stack) * - Add the new function address to kpatch_func_hash
* - Add the new function address to the kpatch_funcs table
* *
* After that, each call to the old function calls into kpatch_ftrace_handler() * After that, each call to the old function calls into kpatch_ftrace_handler()
* which finds the new function in the kpatch_funcs table and updates the * which finds the new function in kpatch_func_hash table and updates the
* return instruction pointer so that ftrace will return to the new function. * return instruction pointer so that ftrace will return to the new function.
*/ */
@ -407,7 +407,7 @@ int kpatch_register(struct kpatch_module *kpmod)
} }
} }
/* Register the ftrace trampoline if it hasn't been done already. */ /* Register the ftrace handler if it hasn't been done already. */
if (!kpatch_num_registered) { if (!kpatch_num_registered) {
ret = register_ftrace_function(&kpatch_ftrace_ops); ret = register_ftrace_function(&kpatch_ftrace_ops);
if (ret) { if (ret) {
@ -424,7 +424,7 @@ int kpatch_register(struct kpatch_module *kpmod)
/* /*
* Idle the CPUs, verify activeness safety, and atomically make the new * Idle the CPUs, verify activeness safety, and atomically make the new
* functions visible to the trampoline. * functions visible to the ftrace handler.
*/ */
ret = stop_machine(kpatch_apply_patch, kpmod, NULL); ret = stop_machine(kpatch_apply_patch, kpmod, NULL);