diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2021-03-18 11:29:56 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-03-19 13:16:44 +0100 |
| commit | 698bacefe993ad2922c9d3b1380591ad489355e9 (patch) | |
| tree | db3411741a396904c002645ecbcfce546a29e4f4 /kernel/static_call.c | |
| parent | 68b1eddd421d2b16c6655eceb48918a1e896bbbc (diff) | |
| download | lwn-698bacefe993ad2922c9d3b1380591ad489355e9.tar.gz lwn-698bacefe993ad2922c9d3b1380591ad489355e9.zip | |
static_call: Align static_call_is_init() patching condition
The intent is to avoid writing init code after init (because the text
might have been freed). The code is needlessly different between
jump_label and static_call and not obviously correct.
The existing code relies on the fact that the module loader clears the
init layout, such that within_module_init() always fails, while
jump_label relies on the module state which is more obvious and
matches the kernel logic.
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/20210318113610.636651340@infradead.org
Diffstat (limited to 'kernel/static_call.c')
| -rw-r--r-- | kernel/static_call.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/kernel/static_call.c b/kernel/static_call.c index 080c8a9ddfaf..fc2259047be2 100644 --- a/kernel/static_call.c +++ b/kernel/static_call.c @@ -149,6 +149,7 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func) }; for (site_mod = &first; site_mod; site_mod = site_mod->next) { + bool init = system_state < SYSTEM_RUNNING; struct module *mod = site_mod->mod; if (!site_mod->sites) { @@ -168,6 +169,7 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func) if (mod) { stop = mod->static_call_sites + mod->num_static_call_sites; + init = mod->state == MODULE_STATE_COMING; } #endif @@ -175,16 +177,8 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func) site < stop && static_call_key(site) == key; site++) { void *site_addr = static_call_addr(site); - if (static_call_is_init(site)) { - /* - * Don't write to call sites which were in - * initmem and have since been freed. - */ - if (!mod && system_state >= SYSTEM_RUNNING) - continue; - if (mod && !within_module_init((unsigned long)site_addr, mod)) - continue; - } + if (!init && static_call_is_init(site)) + continue; if (!kernel_text_address((unsigned long)site_addr)) { WARN_ONCE(1, "can't patch static call site at %pS", |