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| author | Jiri Kosina <jkosina@suse.cz> | 2019-06-29 23:22:33 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-07-02 21:41:35 +0200 |
| commit | 074376ac0e1d1fcd4fafebca86ee6158e7c20680 (patch) | |
| tree | a355f2efe4193e1afe470018af776773ae579b6c /arch | |
| parent | tracing/snapshot: Resize spare buffer if size changed (diff) | |
| download | linux-074376ac0e1d1fcd4fafebca86ee6158e7c20680.tar.xz linux-074376ac0e1d1fcd4fafebca86ee6158e7c20680.zip | |
ftrace/x86: Anotate text_mutex split between ftrace_arch_code_modify_post_process() and ftrace_arch_code_modify_prepare()
ftrace_arch_code_modify_prepare() is acquiring text_mutex, while the
corresponding release is happening in ftrace_arch_code_modify_post_process().
This has already been documented in the code, but let's also make the fact
that this is intentional clear to the semantic analysis tools such as sparse.
Link: http://lkml.kernel.org/r/nycvar.YFH.7.76.1906292321170.27227@cbobk.fhfr.pm
Fixes: 39611265edc1a ("ftrace/x86: Add a comment to why we take text_mutex in ftrace_arch_code_modify_prepare()")
Fixes: d5b844a2cf507 ("ftrace/x86: Remove possible deadlock between register_kprobe() and ftrace_run_update_code()")
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/ftrace.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index d7e93b2783fd..76228525acd0 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -35,6 +35,7 @@ #ifdef CONFIG_DYNAMIC_FTRACE int ftrace_arch_code_modify_prepare(void) + __acquires(&text_mutex) { /* * Need to grab text_mutex to prevent a race from module loading @@ -48,6 +49,7 @@ int ftrace_arch_code_modify_prepare(void) } int ftrace_arch_code_modify_post_process(void) + __releases(&text_mutex) { set_all_modules_text_ro(); set_kernel_text_ro(); |