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Message-Id: <20181104135144.88324-38-sashal@kernel.org>
Date: Sun, 4 Nov 2018 08:51:25 -0500
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Dengcheng Zhu <dzhu@...ecomp.com>,
Paul Burton <paul.burton@...s.com>, pburton@...ecomp.com,
ralf@...ux-mips.org, linux-mips@...ux-mips.org,
rachel.mozes@...el.com, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 38/57] MIPS: kexec: Mark CPU offline before disabling local IRQ
From: Dengcheng Zhu <dzhu@...ecomp.com>
[ Upstream commit dc57aaf95a516f70e2d527d8287a0332c481a226 ]
After changing CPU online status, it will not be sent any IPIs such as in
__flush_cache_all() on software coherency systems. Do this before disabling
local IRQ.
Signed-off-by: Dengcheng Zhu <dzhu@...ecomp.com>
Signed-off-by: Paul Burton <paul.burton@...s.com>
Patchwork: https://patchwork.linux-mips.org/patch/20571/
Cc: pburton@...ecomp.com
Cc: ralf@...ux-mips.org
Cc: linux-mips@...ux-mips.org
Cc: rachel.mozes@...el.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
arch/mips/kernel/crash.c | 3 +++
arch/mips/kernel/machine_kexec.c | 3 +++
2 files changed, 6 insertions(+)
diff --git a/arch/mips/kernel/crash.c b/arch/mips/kernel/crash.c
index d455363d51c3..4c07a43a3242 100644
--- a/arch/mips/kernel/crash.c
+++ b/arch/mips/kernel/crash.c
@@ -36,6 +36,9 @@ static void crash_shutdown_secondary(void *passed_regs)
if (!cpu_online(cpu))
return;
+ /* We won't be sent IPIs any more. */
+ set_cpu_online(cpu, false);
+
local_irq_disable();
if (!cpumask_test_cpu(cpu, &cpus_in_crash))
crash_save_cpu(regs, cpu);
diff --git a/arch/mips/kernel/machine_kexec.c b/arch/mips/kernel/machine_kexec.c
index 8b574bcd39ba..4b3726e4fe3a 100644
--- a/arch/mips/kernel/machine_kexec.c
+++ b/arch/mips/kernel/machine_kexec.c
@@ -118,6 +118,9 @@ machine_kexec(struct kimage *image)
*ptr = (unsigned long) phys_to_virt(*ptr);
}
+ /* Mark offline BEFORE disabling local irq. */
+ set_cpu_online(smp_processor_id(), false);
+
/*
* we do not want to be bothered.
*/
--
2.17.1
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