linux-kernel - [PATCH 2/2] freezer,sched: clean saved_state when restoring it during thaw

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231120-freezer-state-multiple-thaws-v1-2-f2e1dd7ce5a2@quicinc.com>
Date:   Mon, 20 Nov 2023 09:36:32 -0800
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>, "Ingo Molnar" <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
CC:     <linux-arm-msm@...r.kernel.org>,
        Pavan Kondeti <quic_pkondeti@...cinc.com>,
        "Aiqun Yu (Maria)" <quic_aiquny@...cinc.com>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Elliot Berman <quic_eberman@...cinc.com>
Subject: [PATCH 2/2] freezer,sched: clean saved_state when restoring it
 during thaw

Clean saved_state after using it during thaw. Cleaning the saved_state
allows us to avoid some unnecessary branches in ttwu_state_match.

Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
---
 kernel/freezer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/freezer.c b/kernel/freezer.c
index 759006a9a910..f57aaf96b829 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -187,6 +187,7 @@ static int __restore_freezer_state(struct task_struct *p, void *arg)
 
 	if (state != TASK_RUNNING) {
 		WRITE_ONCE(p->__state, state);
+		p->saved_state = TASK_RUNNING;
 		return 1;
 	}
 

-- 
2.41.0