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| author | Petr Mladek <pmladek@suse.com> | 2019-05-31 09:41:47 +0200 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2019-06-05 16:35:47 +0200 |
| commit | f36e664516b02c7f54bbd3094bab047d54bb5488 (patch) | |
| tree | 1b38ba781e732d39f39515b711aa37de47fe58bb /kernel/livepatch | |
| parent | 573de2a6e844cb230c4483833f29b8344a6a17cc (diff) | |
| download | linux-f36e664516b02c7f54bbd3094bab047d54bb5488.tar.gz linux-f36e664516b02c7f54bbd3094bab047d54bb5488.tar.bz2 linux-f36e664516b02c7f54bbd3094bab047d54bb5488.zip | |
livepatch: Use static buffer for debugging messages under rq lock
The err_buf array uses 128 bytes of stack space. Move it off the stack
by making it static. It's safe to use a shared buffer because
klp_try_switch_task() is called under klp_mutex.
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'kernel/livepatch')
| -rw-r--r-- | kernel/livepatch/transition.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index c53370d596be..0a3889c4f617 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -293,11 +293,11 @@ static int klp_check_stack(struct task_struct *task, char *err_buf) */ static bool klp_try_switch_task(struct task_struct *task) { + static char err_buf[STACK_ERR_BUF_SIZE]; struct rq *rq; struct rq_flags flags; int ret; bool success = false; - char err_buf[STACK_ERR_BUF_SIZE]; err_buf[0] = '\0'; @@ -340,7 +340,6 @@ done: pr_debug("%s", err_buf); return success; - } /* |