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| author |   Peter Zijlstra <peterz@infradead.org> | 2021-03-18 11:31:51 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-03-19 13:16:44 +0100 |
| commit | 38c93587375053c5b9ef093f4a5ea754538cba32 (patch) | |
| tree | 8c6554263f39529cfb04901f006415d4fdb83cac /kernel/jump_label.c | |
| parent | static_call: Align static_call_is_init() patching condition (diff) | |
| download | wireguard-linux-38c93587375053c5b9ef093f4a5ea754538cba32.tar.xz wireguard-linux-38c93587375053c5b9ef093f4a5ea754538cba32.zip | |
static_call: Fix static_call_update() sanity check
Sites that match init_section_contains() get marked as INIT. For
built-in code init_sections contains both __init and __exit text. OTOH
kernel_text_address() only explicitly includes __init text (and there
are no __exit text markers).
Match what jump_label already does and ignore the warning for INIT
sites. Also see the excellent changelog for commit: 8f35eaa5f2de
("jump_label: Don't warn on __exit jump entries")
Fixes: 9183c3f9ed710 ("static_call: Add inline static call infrastructure")
Reported-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: Sumit Garg <sumit.garg@linaro.org>
Link: https://lkml.kernel.org/r/20210318113610.739542434@infradead.org
Diffstat (limited to 'kernel/jump_label.c')
| -rw-r--r-- | kernel/jump_label.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/jump_label.c b/kernel/jump_label.c index c6a39d662935..ba39fbb1f8e7 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -407,6 +407,14 @@ static bool jump_label_can_update(struct jump_entry *entry, bool init) return false; if (!kernel_text_address(jump_entry_code(entry))) { + /* + * This skips patching built-in __exit, which + * is part of init_section_contains() but is + * not part of kernel_text_address(). + * + * Skipping built-in __exit is fine since it + * will never be executed. + */ WARN_ONCE(!jump_entry_is_init(entry), "can't patch jump_label at %pS", (void *)jump_entry_code(entry)); |