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Merge branch 'for-4.16/remove-immediate' into for-linus

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Pull 'immediate' feature removal from Miroslav Benes.
This commit is contained in:
Jiri Kosina
2018-01-31 16:33:52 +01:00
parent 8869016d3a d0807da78e
commit d05b695c25
8 changed files with 33 additions and 181 deletions
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12
kernel/livepatch/core.c
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@@ -366,11 +366,6 @@ static int __klp_enable_patch(struct klp_patch *patch)
/*
* A reference is taken on the patch module to prevent it from being
* unloaded.
*
* Note: For immediate (no consistency model) patches we don't allow
* patch modules to unload since there is no safe/sane method to
* determine if a thread is still running in the patched code contained
* in the patch module once the ftrace registration is successful.
*/
if (!try_module_get(patch->mod))
return -ENODEV;
@@ -894,12 +889,7 @@ int klp_register_patch(struct klp_patch *patch)
if (!klp_initialized())
return -ENODEV;
/*
* Architectures without reliable stack traces have to set
* patch->immediate because there's currently no way to patch kthreads
* with the consistency model.
*/
if (!klp_have_reliable_stack() && !patch->immediate) {
if (!klp_have_reliable_stack()) {
pr_err("This architecture doesn't have support for the livepatch consistency model.\n");
return -ENOSYS;
}