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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Prarit Bhargava <prarit@redhat.com>,
	Richard Henderson <rth@twiddle.net>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Matt Turner <mattst88@gmail.com>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 25/30] alpha: Send stop IPI to send to online CPUs
Date: Fri, 13 Aug 2021 17:06:53 +0200	[thread overview]
Message-ID: <20210813150523.264565868@linuxfoundation.org> (raw)
In-Reply-To: <20210813150522.445553924@linuxfoundation.org>

From: Prarit Bhargava <prarit@redhat.com>

[ Upstream commit caace6ca4e06f09413fb8f8a63319594cfb7d47d ]

This issue was noticed while debugging a shutdown issue where some
secondary CPUs are not being shutdown correctly.  A fix for that [1] requires
that secondary cpus be offlined using the cpu_online_mask so that the
stop operation is a no-op if CPU HOTPLUG is disabled.  I, like the author in
[1] looked at the architectures and found that alpha is one of two
architectures that executes smp_send_stop() on all possible CPUs.

On alpha, smp_send_stop() sends an IPI to all possible CPUs but only needs
to send them to online CPUs.

Send the stop IPI to only the online CPUs.

[1] https://lkml.org/lkml/2020/1/10/250

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/alpha/kernel/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index 46bf263c3153..d2477a502ce7 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -584,7 +584,7 @@ void
 smp_send_stop(void)
 {
 	cpumask_t to_whom;
-	cpumask_copy(&to_whom, cpu_possible_mask);
+	cpumask_copy(&to_whom, cpu_online_mask);
 	cpumask_clear_cpu(smp_processor_id(), &to_whom);
 #ifdef DEBUG_IPI_MSG
 	if (hard_smp_processor_id() != boot_cpu_id)
-- 
2.30.2




  parent reply	other threads:[~2021-08-13 15:10 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-13 15:06 [PATCH 4.9 00/30] 4.9.280-rc1 review Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 01/30] ALSA: seq: Fix racy deletion of subscriber Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 02/30] scsi: sr: Return correct event when media event code is 3 Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 03/30] media: videobuf2-core: dequeue if start_streaming fails Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 04/30] net: natsemi: Fix missing pci_disable_device() in probe and remove Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 05/30] mips: Fix non-POSIX regexp Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 06/30] bnx2x: fix an error code in bnx2x_nic_load() Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 07/30] net: pegasus: fix uninit-value in get_interrupt_interval Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 08/30] net: fec: fix use-after-free in fec_drv_remove Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 09/30] net: vxge: fix use-after-free in vxge_device_unregister Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 10/30] Bluetooth: defer cleanup of resources in hci_unregister_dev() Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 11/30] USB: usbtmc: Fix RCU stall warning Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 12/30] USB: serial: option: add Telit FD980 composition 0x1056 Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 13/30] USB: serial: ch341: fix character loss at high transfer rates Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 14/30] USB: serial: ftdi_sio: add device ID for Auto-M3 OP-COM v2 Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 15/30] usb: otg-fsm: Fix hrtimer list corruption Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 16/30] scripts/tracing: fix the bug that cant parse raw_trace_func Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 17/30] media: rtl28xxu: fix zero-length control request Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 18/30] pipe: increase minimum default pipe size to 2 pages Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 19/30] serial: 8250: Mask out floating 16/32-bit bus bits Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 20/30] MIPS: Malta: Do not byte-swap accesses to the CBUS UART Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 21/30] pcmcia: i82092: fix a null pointer dereference bug Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 22/30] perf/x86/amd: Dont touch the AMD64_EVENTSEL_HOSTONLY bit inside the guest Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 23/30] reiserfs: add check for root_inode in reiserfs_fill_super Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 24/30] reiserfs: check directory items on read from disk Greg Kroah-Hartman
2021-08-13 15:06 ` Greg Kroah-Hartman [this message]
2021-08-13 15:06 ` [PATCH 4.9 26/30] net/qla3xxx: fix schedule while atomic in ql_wait_for_drvr_lock and ql_adapter_reset Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 27/30] USB:ehci:fix Kunpeng920 ehci hardware problem Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 28/30] ppp: Fix generating ppp unit id when ifname is not specified Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 29/30] net: xilinx_emaclite: Do not print real IOMEM pointer Greg Kroah-Hartman
2021-08-13 15:06 ` [PATCH 4.9 30/30] ovl: prevent private clone if bind mount is not allowed Greg Kroah-Hartman
2021-08-13 23:26 ` [PATCH 4.9 00/30] 4.9.280-rc1 review Shuah Khan
2021-08-14 14:12 ` Naresh Kamboju
2021-08-14 19:50 ` Guenter Roeck

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