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authorPeter Zijlstra <peterz@infradead.org>2024-03-13 19:01:03 +0100
committerIngo Molnar <mingo@kernel.org>2024-03-22 11:18:16 +0100
commit91a1d97ef482c1e4c9d4c1c656a53b0f6b16d0ed (patch)
tree0a5984cd9f64775013f069da345663f8330854c9 /init
parent3774b28d8f3b9e8a946beb9550bee85e5454fc9f (diff)
jump_label,module: Don't alloc static_key_mod for __ro_after_init keys
When a static_key is marked ro_after_init, its state will never change (after init), therefore jump_label_update() will never need to iterate the entries, and thus module load won't actually need to track this -- avoiding the static_key::next write. Therefore, mark these keys such that jump_label_add_module() might recognise them and avoid the modification. Use the special state: 'static_key_linked(key) && !static_key_mod(key)' to denote such keys. jump_label_add_module() does not exist under CONFIG_JUMP_LABEL=n, so the newly-introduced jump_label_init_ro() can be defined as a nop for that configuration. [ mingo: Renamed jump_label_ro() to jump_label_init_ro() ] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Valentin Schneider <vschneid@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Josh Poimboeuf <jpoimboe@kernel.org> Link: https://lore.kernel.org/r/20240313180106.2917308-2-vschneid@redhat.com
Diffstat (limited to 'init')
-rw-r--r--init/main.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index 2ca52474d0c3..6c3f251d6ef8 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1408,6 +1408,7 @@ static void mark_readonly(void)
* insecure pages which are W+X.
*/
flush_module_init_free_work();
+ jump_label_init_ro();
mark_rodata_ro();
debug_checkwx();
rodata_test();