From:   "Eric W. Biederman" <ebiederm@xmission.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-arch@vger.kernel.org, linux-api@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Alexey Gladkov <legion@kernel.org>,
        Kyle Huey <me@kylehuey.com>, Oleg Nesterov <oleg@redhat.com>,
        Kees Cook <keescook@chromium.org>,
        Al Viro <viro@ZenIV.linux.org.uk>,
        "Eric W. Biederman" <ebiederm@xmission.com>
Date:   Mon, 13 Dec 2021 16:53:45 -0600
Message-Id: <20211213225350.27481-3-ebiederm@xmission.com>
In-Reply-To: <87a6ha4zsd.fsf@email.froward.int.ebiederm.org>
References: <87a6ha4zsd.fsf@email.froward.int.ebiederm.org>
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Subject: [PATCH 3/8] signal: Have the oom killer detect coredumps using signal->core_state
Precedence: bulk

In preparation for removing the flag SIGNAL_GROUP_COREDUMP change
__task_will_free_mem to test signal->core_state instead of the flag
SIGNAL_GROUP_COREDUMP.

Both fields are protected by siglock and both live in signal_struct so
there are no real tradeoffs here, just a change to which field is
being tested.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
 mm/oom_kill.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 1ddabefcfb5a..5c92aad8ca1a 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -793,7 +793,7 @@ static inline bool __task_will_free_mem(struct task_struct *task)
 	 * coredump_task_exit(), so the oom killer cannot assume that
 	 * the process will promptly exit and release memory.
 	 */
-	if (sig->flags & SIGNAL_GROUP_COREDUMP)
+	if (sig->core_state)
 		return false;
 
 	if (sig->flags & SIGNAL_GROUP_EXIT)
-- 
2.29.2