linux-kernel - [PATCH 3/8] Revert "signal: don't allow sending any signals to PF_IO

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Date:   Thu, 25 Mar 2021 18:39:26 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     io-uring@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, ebiederm@...ssion.com,
        metze@...ba.org, oleg@...hat.com, linux-kernel@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 3/8] Revert "signal: don't allow sending any signals to PF_IO_WORKER threads"

This reverts commit 5be28c8f85ce99ed2d329d2ad8bdd18ea19473a5.

IO threads now take signals just fine, so there's no reason to limit them
specifically. Revert the change that prevented that from happening.

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 kernel/signal.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index f2a1b898da29..cb9acdfb32fa 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -834,9 +834,6 @@ static int check_kill_permission(int sig, struct kernel_siginfo *info,
 
 	if (!valid_signal(sig))
 		return -EINVAL;
-	/* PF_IO_WORKER threads don't take any signals */
-	if (t->flags & PF_IO_WORKER)
-		return -ESRCH;
 
 	if (!si_fromuser(info))
 		return 0;
-- 
2.31.0