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Misc fixes/updates: 

- Fix static keys usage in module __init sections
 - Add separate MAINTAINERS entry for static branches/calls
 - Fix lockdep splat with CONFIG_PREEMPTIRQ_EVENTS=y tracing
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-urgent-2020-12-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking fixes from Ingo Molnar:
 "Misc fixes/updates:

   - Fix static keys usage in module __init sections

   - Add separate MAINTAINERS entry for static branches/calls

   - Fix lockdep splat with CONFIG_PREEMPTIRQ_EVENTS=y tracing"

* tag 'locking-urgent-2020-12-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  softirq: Avoid bad tracing / lockdep interaction
  jump_label/static_call: Add MAINTAINERS
  jump_label: Fix usage in module __init
This commit is contained in:
Linus Torvalds 2020-12-27 09:06:10 -08:00
parent 2eeefc60ad 91ea62d58b
commit 6be5f58215
3 changed files with 22 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
MAINTAINERS
View File

@ -16917,6 +16917,22 @@ M: Ion Badulescu <ionut@badula.org>
S: Odd Fixes
F: drivers/net/ethernet/adaptec/starfire*
STATIC BRANCH/CALL
M: Peter Zijlstra <peterz@infradead.org>
M: Josh Poimboeuf <jpoimboe@redhat.com>
M: Jason Baron <jbaron@akamai.com>
R: Steven Rostedt <rostedt@goodmis.org>
R: Ard Biesheuvel <ardb@kernel.org>
S: Supported
F: arch/*/include/asm/jump_label*.h
F: arch/*/include/asm/static_call*.h
F: arch/*/kernel/jump_label.c
F: arch/*/kernel/static_call.c
F: include/linux/jump_label*.h
F: include/linux/static_call*.h
F: kernel/jump_label.c
F: kernel/static_call.c
STEC S1220 SKD DRIVER
M: Damien Le Moal <Damien.LeMoal@wdc.com>
L: linux-block@vger.kernel.org

8
kernel/jump_label.c
View File

@ -793,6 +793,7 @@ int jump_label_text_reserved(void *start, void *end)
static void jump_label_update(struct static_key *key)
{
struct jump_entry *stop = __stop___jump_table;
bool init = system_state < SYSTEM_RUNNING;
struct jump_entry *entry;
#ifdef CONFIG_MODULES
struct module *mod;
@ -804,15 +805,16 @@ static void jump_label_update(struct static_key *key)
preempt_disable();
mod = __module_address((unsigned long)key);
if (mod)
if (mod) {
stop = mod->jump_entries + mod->num_jump_entries;
init = mod->state == MODULE_STATE_COMING;
}
preempt_enable();
#endif
entry = static_key_entries(key);
/* if there are no users, entry can be NULL */
if (entry)
__jump_label_update(key, entry, stop,
system_state < SYSTEM_RUNNING);
__jump_label_update(key, entry, stop, init);
}
#ifdef CONFIG_STATIC_KEYS_SELFTEST

2
kernel/softirq.c
View File

@ -186,7 +186,7 @@ void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
* Keep preemption disabled until we are done with
* softirq processing:
*/
preempt_count_sub(cnt - 1);
__preempt_count_sub(cnt - 1);
if (unlikely(!in_interrupt() && local_softirq_pending())) {
/*