diff options
| author | Guo Ren <[email protected]> | 2022-04-07 15:33:22 +0800 |
|---|---|---|
| committer | Max Filippov <[email protected]> | 2022-04-13 03:36:34 -0700 |
| commit | ee69d4be8fd064cd08270b4808d2dfece3614ee0 (patch) | |
| tree | 506e8f5440bcba2b968f6f44737e13c96ea4b7d3 | |
| parent | ce522ba9ef7e2d9fb22a39eb3371c0c64e2a433e (diff) | |
xtensa: patch_text: Fixup last cpu should be master
These patch_text implementations are using stop_machine_cpuslocked
infrastructure with atomic cpu_count. The original idea: When the
master CPU patch_text, the others should wait for it. But current
implementation is using the first CPU as master, which couldn't
guarantee the remaining CPUs are waiting. This patch changes the
last CPU as the master to solve the potential risk.
Fixes: 64711f9a47d4 ("xtensa: implement jump_label support")
Signed-off-by: Guo Ren <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Reviewed-by: Max Filippov <[email protected]>
Reviewed-by: Masami Hiramatsu <[email protected]>
Cc: <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Max Filippov <[email protected]>
| -rw-r--r-- | arch/xtensa/kernel/jump_label.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/xtensa/kernel/jump_label.c b/arch/xtensa/kernel/jump_label.c index 0dde21e0d3de..ad1841cecdfb 100644 --- a/arch/xtensa/kernel/jump_label.c +++ b/arch/xtensa/kernel/jump_label.c @@ -40,7 +40,7 @@ static int patch_text_stop_machine(void *data) { struct patch *patch = data; - if (atomic_inc_return(&patch->cpu_count) == 1) { + if (atomic_inc_return(&patch->cpu_count) == num_online_cpus()) { local_patch_text(patch->addr, patch->data, patch->sz); atomic_inc(&patch->cpu_count); } else { |