[to-be-updated] powerpc-watchdog-use-sys_info_with_filter-to-avoid-duplicate-backtraces.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: powerpc/watchdog: use sys_info_with_filter() to avoid duplicate backtraces
has been removed from the -mm tree.  Its filename was
     powerpc-watchdog-use-sys_info_with_filter-to-avoid-duplicate-backtraces.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: Bradley Morgan <include@grrlz.net>
Subject: powerpc/watchdog: use sys_info_with_filter() to avoid duplicate backtraces
Date: Thu, 25 Jun 2026 15:25:57 +0000

The powerpc watchdog prints all CPU backtraces itself.  When the watchdog
mask contains only SYS_INFO_ALL_BT, stripping that bit leaves zero and
sys_info(0) falls back to kernel_sys_info.

Use sys_info_with_filter() so an explicit all_bt mask does not request the
global default.

Link: https://lore.kernel.org/20260625152558.7450-4-include@grrlz.net
Fixes: a9af76a78760 ("watchdog: add sys_info sysctls to dump sys info on system lockup")
Signed-off-by: Bradley Morgan <include@grrlz.net>
Cc: Doug Anderson <dianders@chromium.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/powerpc/kernel/watchdog.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/arch/powerpc/kernel/watchdog.c~powerpc-watchdog-use-sys_info_with_filter-to-avoid-duplicate-backtraces
+++ a/arch/powerpc/kernel/watchdog.c
@@ -201,6 +201,7 @@ static bool set_cpu_stuck(int cpu)
 static void watchdog_smp_panic(int cpu)
 {
 	static cpumask_t wd_smp_cpus_ipi; // protected by reporting
+	unsigned long si_mask;
 	unsigned long flags;
 	u64 tb, last_reset;
 	int c;
@@ -236,8 +237,9 @@ static void watchdog_smp_panic(int cpu)
 	pr_emerg("CPU %d TB:%lld, last SMP heartbeat TB:%lld (%lldms ago)\n",
 		 cpu, tb, last_reset, tb_to_ns(tb - last_reset) / 1000000);
 
+	si_mask = READ_ONCE(hardlockup_si_mask);
 	if (sysctl_hardlockup_all_cpu_backtrace ||
-	    (hardlockup_si_mask & SYS_INFO_ALL_BT)) {
+	    (si_mask & SYS_INFO_ALL_BT)) {
 		trigger_allbutcpu_cpu_backtrace(cpu);
 		cpumask_clear(&wd_smp_cpus_ipi);
 	} else {
@@ -251,7 +253,7 @@ static void watchdog_smp_panic(int cpu)
 		}
 	}
 
-	sys_info(hardlockup_si_mask & ~SYS_INFO_ALL_BT);
+	sys_info_with_filter(si_mask, SYS_INFO_ALL_BT);
 	if (hardlockup_panic)
 		nmi_panic(NULL, "Hard LOCKUP");
 
@@ -371,6 +373,7 @@ static void watchdog_timer_interrupt(int
 
 DEFINE_INTERRUPT_HANDLER_NMI(soft_nmi_interrupt)
 {
+	unsigned long si_mask;
 	unsigned long flags;
 	int cpu = raw_smp_processor_id();
 	u64 tb;
@@ -418,11 +421,12 @@ DEFINE_INTERRUPT_HANDLER_NMI(soft_nmi_in
 
 		xchg(&__wd_nmi_output, 1); // see wd_lockup_ipi
 
+		si_mask = READ_ONCE(hardlockup_si_mask);
 		if (sysctl_hardlockup_all_cpu_backtrace ||
-		    (hardlockup_si_mask & SYS_INFO_ALL_BT))
+		    (si_mask & SYS_INFO_ALL_BT))
 			trigger_allbutcpu_cpu_backtrace(cpu);
 
-		sys_info(hardlockup_si_mask & ~SYS_INFO_ALL_BT);
+		sys_info_with_filter(si_mask, SYS_INFO_ALL_BT);
 		if (hardlockup_panic)
 			nmi_panic(regs, "Hard LOCKUP");
 
_

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

panic-use-sys_info_with_filter-to-avoid-duplicate-backtraces.patch
lib-string-fix-memchr_inv-for-large-ranges.patch