linux-kernel - [PATCH] s390: allow reschedule on syscall restart

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Message-Id: <20210121143926.21440-2-svens@linux.ibm.com>
Date:   Thu, 21 Jan 2021 15:39:26 +0100
From:   Sven Schnelle <svens@...ux.ibm.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Frederic Weisbecker <frederic@...nel.org>,
        Sven Schnelle <svens@...ux.ibm.com>
Subject: [PATCH] s390: allow reschedule on syscall restart

Commit 845f44e8ef28 ("sched: Report local wake up on resched blind zone
within idle loop") from next-20210121 causes a warning because s390
doesn't call sched_resched_local_allow() when restarting a syscall.

Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
---
 arch/s390/kernel/syscall.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/s390/kernel/syscall.c b/arch/s390/kernel/syscall.c
index bc8e650e377d..2b39ac40f970 100644
--- a/arch/s390/kernel/syscall.c
+++ b/arch/s390/kernel/syscall.c
@@ -162,6 +162,7 @@ void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
 		do_syscall(regs);
 		if (!test_pt_regs_flag(regs, PIF_SYSCALL_RESTART))
 			break;
+		sched_resched_local_allow();
 		local_irq_enable();
 	}
 	exit_to_user_mode();
-- 
2.17.1