[to-be-updated] panic-make-force_cpu-redirect-work-from-an-nmi.patch removed from -mm tree

[to-be-updated] panic-make-force_cpu-redirect-work-from-an-nmi.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: panic: make force_cpu redirect work from an NMI
has been removed from the -mm tree.  Its filename was
     panic-make-force_cpu-redirect-work-from-an-nmi.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: Bradley Morgan <include@grrlz.net>
Subject: panic: make force_cpu redirect work from an NMI
Date: Tue, 7 Jul 2026 20:59:21 +0000

nmi_panic sets panic_cpu first.  Bail only on a different owner, and hand
panic_cpu to the target after the IPI.

Found by sashiko [1].

Link: https://lore.kernel.org/20260707205921.15247-1-include@grrlz.net
Link: https://sashiko.dev/#/patchset/20260707183253.9793-1-include@grrlz.net [1]
Signed-off-by: Bradley Morgan <include@grrlz.net>
Cc: Feng Tang <feng.tang@linux.alibaba.com>
Cc: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/panic.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/kernel/panic.c~panic-make-force_cpu-redirect-work-from-an-nmi
+++ a/kernel/panic.c
@@ -396,8 +396,8 @@ static bool panic_try_force_cpu(const ch
 		return false;
 	}
 
-	/* Another panic already in progress */
-	if (panic_in_progress())
+	/* Bail only if a different CPU is already handling it. */
+	if (panic_in_progress() && atomic_read(&panic_cpu) != this_cpu)
 		return false;
 
 	/* Which CPU won the race? */
@@ -440,6 +440,9 @@ static bool panic_try_force_cpu(const ch
 		return false;
 	}
 
+	/* Hand panic_cpu to the target so it wins its own panic_try_start. */
+	atomic_set(&panic_cpu, panic_force_cpu);
+
 	/* IPI/NMI sent, this CPU should stop */
 	return true;
 }
_

Patches currently in -mm which might be from include@grrlz.net are

lib-string-fix-memchr_inv-for-large-ranges.patch
signal-avoid-shared-siginfo-namespace-rewrites.patch
panic-fix-va_list-reuse-in-panic_try_force_cpu.patch
reboot-use-lookup-tables-for-sysfs-mode-and-type-strings.patch
reboot-use-a-lookup-table-for-hw_protection_action-strings.patch
panic-stop-cpus-that-lose-the-panic_redirect_cpu-race.patch