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authorPetr Mladek <pmladek@suse.com>2019-04-24 10:55:48 +0200
committerPetr Mladek <pmladek@suse.com>2019-04-29 14:46:07 +0200
commit31adf2308f33dcae59009019675224be0978bc70 (patch)
treebbfbea22da40cfdc0f54387ef18e04a4c9890505 /kernel
parent43bd3a95c98e1a86b8b55d97f745c224ecff02b9 (diff)
downloadlwn-31adf2308f33dcae59009019675224be0978bc70.tar.gz
lwn-31adf2308f33dcae59009019675224be0978bc70.zip
livepatch: Convert error about unsupported reliable stacktrace into a warning
The commit d0807da78e11d46f ("livepatch: Remove immediate feature") caused that any livepatch was refused when reliable stacktraces were not supported on the given architecture. The limitation is too strong. User space processes are safely migrated even when entering or leaving the kernel. Kthreads transition would need to get forced. But it is safe when: + The livepatch does not change the semantic of the code. + Callbacks do not depend on a safely finished transition. Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/livepatch/core.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index eb0ee10a1981..14f33ab6c583 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -1003,11 +1003,10 @@ int klp_enable_patch(struct klp_patch *patch)
return -ENODEV;
if (!klp_have_reliable_stack()) {
- pr_err("This architecture doesn't have support for the livepatch consistency model.\n");
- return -EOPNOTSUPP;
+ pr_warn("This architecture doesn't have support for the livepatch consistency model.\n");
+ pr_warn("The livepatch transition may never complete.\n");
}
-
mutex_lock(&klp_mutex);
ret = klp_init_patch_early(patch);