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Livepatching changes for 6.2 

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Merge tag 'livepatching-for-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

Pull livepatching update from Petr Mladek:

 - code cleanup

* tag 'livepatching-for-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching:
  livepatch: Move the result-invariant calculation out of the loop
This commit is contained in:
Linus Torvalds 2022-12-12 16:01:02 -08:00
parent a312a8cc3c 53910ef7ba
commit e1a1ccef7a
1 changed files with 28 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
kernel/livepatch/transition.c
View File

@ -196,37 +196,37 @@ static int klp_check_stack_func(struct klp_func *func, unsigned long *entries,
struct klp_ops *ops;
int i;
if (klp_target_state == KLP_UNPATCHED) {
/*
* Check for the to-be-unpatched function
* (the func itself).
*/
func_addr = (unsigned long)func->new_func;
func_size = func->new_size;
} else {
/*
* Check for the to-be-patched function
* (the previous func).
*/
ops = klp_find_ops(func->old_func);
if (list_is_singular(&ops->func_stack)) {
/* original function */
func_addr = (unsigned long)func->old_func;
func_size = func->old_size;
} else {
/* previously patched function */
struct klp_func *prev;
prev = list_next_entry(func, stack_node);
func_addr = (unsigned long)prev->new_func;
func_size = prev->new_size;
}
}
for (i = 0; i < nr_entries; i++) {
address = entries[i];
if (klp_target_state == KLP_UNPATCHED) {
/*
* Check for the to-be-unpatched function
* (the func itself).
*/
func_addr = (unsigned long)func->new_func;
func_size = func->new_size;
} else {
/*
* Check for the to-be-patched function
* (the previous func).
*/
ops = klp_find_ops(func->old_func);
if (list_is_singular(&ops->func_stack)) {
/* original function */
func_addr = (unsigned long)func->old_func;
func_size = func->old_size;
} else {
/* previously patched function */
struct klp_func *prev;
prev = list_next_entry(func, stack_node);
func_addr = (unsigned long)prev->new_func;
func_size = prev->new_size;
}
}
if (address >= func_addr && address < func_addr + func_size)
return -EAGAIN;
}