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From: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
To: akpm@linux-foundation.org, bhe@redhat.com, pmladek@suse.com,
	kexec@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org,
	netdev@vger.kernel.org, x86@kernel.org, kernel-dev@igalia.com,
	kernel@gpiccoli.net, halves@canonical.com, fabiomirmar@gmail.com,
	alejandro.j.jimenez@oracle.com,
	andriy.shevchenko@linux.intel.com, arnd@arndb.de, bp@alien8.de,
	corbet@lwn.net, d.hatayama@jp.fujitsu.com,
	dave.hansen@linux.intel.com, dyoung@redhat.com,
	feng.tang@intel.com, gregkh@linuxfoundation.org,
	mikelley@microsoft.com, hidehiro.kawai.ez@hitachi.com,
	jgross@suse.com, john.ogness@linutronix.de,
	keescook@chromium.org, luto@kernel.org, mhiramat@kernel.org,
	mingo@redhat.com, paulmck@kernel.org, peterz@infradead.org,
	rostedt@goodmis.org, senozhatsky@chromium.org,
	stern@rowland.harvard.edu, tglx@linutronix.de, vgoyal@redhat.com,
	vkuznets@redhat.com, will@kernel.org, xuqiang36@huawei.com,
	"Guilherme G. Piccoli" <gpiccoli@igalia.com>,
	linux-um@lists.infradead.org,
	Anton Ivanov <anton.ivanov@cambridgegreys.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	Richard Weinberger <richard@nod.at>
Subject: [PATCH V3 04/11] um: Improve panic notifiers consistency and ordering
Date: Fri, 19 Aug 2022 19:17:24 -0300	[thread overview]
Message-ID: <20220819221731.480795-5-gpiccoli@igalia.com> (raw)
In-Reply-To: <20220819221731.480795-1-gpiccoli@igalia.com>

Currently the panic notifiers from user mode linux don't follow
the convention for most of the other notifiers present in the
kernel (indentation, priority setting, numeric return).
More important, the priorities could be improved, since it's a
special case (userspace), hence we could run the notifiers earlier;
user mode linux shouldn't care much with other panic notifiers but
the ordering among the mconsole and arch notifier is important,
given that the arch one effectively triggers a core dump.

Fix that by running the mconsole notifier as the first panic
notifier, followed by the architecture one (that coredumps).

Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>

V3:
- No changes.

V2:
- Kept the notifier header to avoid implicit usage - thanks
Johannes for the suggestion!
---
 arch/um/drivers/mconsole_kern.c | 7 +++----
 arch/um/kernel/um_arch.c        | 8 ++++----
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 8ca67a692683..69af3ce8407a 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -846,13 +846,12 @@ static int notify_panic(struct notifier_block *self, unsigned long unused1,
 
 	mconsole_notify(notify_socket, MCONSOLE_PANIC, message,
 			strlen(message) + 1);
-	return 0;
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block panic_exit_notifier = {
-	.notifier_call 		= notify_panic,
-	.next 			= NULL,
-	.priority 		= 1
+	.notifier_call	= notify_panic,
+	.priority	= INT_MAX, /* run as soon as possible */
 };
 
 static int add_notifier(void)
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index e0de60e503b9..ae272878f692 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -247,13 +247,13 @@ static int panic_exit(struct notifier_block *self, unsigned long unused1,
 	bust_spinlocks(0);
 	uml_exitcode = 1;
 	os_dump_core();
-	return 0;
+
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block panic_exit_notifier = {
-	.notifier_call 		= panic_exit,
-	.next 			= NULL,
-	.priority 		= 0
+	.notifier_call	= panic_exit,
+	.priority	= INT_MAX - 1, /* run as 2nd notifier, won't return */
 };
 
 void uml_finishsetup(void)
-- 
2.37.2


WARNING: multiple messages have this Message-ID (diff)
From: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
To: akpm@linux-foundation.org, bhe@redhat.com, pmladek@suse.com,
	kexec@lists.infradead.org
Cc: linux-hyperv@vger.kernel.org, halves@canonical.com,
	peterz@infradead.org, dave.hansen@linux.intel.com,
	feng.tang@intel.com, mikelley@microsoft.com, will@kernel.org,
	Anton Ivanov <anton.ivanov@cambridgegreys.com>,
	arnd@arndb.de, corbet@lwn.net, paulmck@kernel.org,
	fabiomirmar@gmail.com, x86@kernel.org, mingo@redhat.com,
	stern@rowland.harvard.edu, dyoung@redhat.com, vgoyal@redhat.com,
	alejandro.j.jimenez@oracle.com, keescook@chromium.org,
	john.ogness@linutronix.de, linux-um@lists.infradead.org,
	rostedt@goodmis.org, Richard Weinberger <richard@nod.at>,
	bp@alien8.de, luto@kernel.org, hidehiro.kawai.ez@hitachi.com,
	tglx@linutronix.de, andriy.shevchenko@linux.intel.com,
	Johannes Berg <johannes@sipsolutions.net>,
	jgross@suse.com, gregkh@linuxfoundation.org, kernel@gpiccoli.net,
	linux-kernel@vger.kernel.org, xuqiang36@huawei.com,
	senozhatsky@chromium.org, d.hatayama@jp.fujitsu.com,
	mhiramat@kernel.org, kernel-dev@igalia.com,
	netdev@vger.kernel.org, vkuznets@redhat.com
Subject: [PATCH V3 04/11] um: Improve panic notifiers consistency and ordering
Date: Fri, 19 Aug 2022 19:17:24 -0300	[thread overview]
Message-ID: <20220819221731.480795-5-gpiccoli@igalia.com> (raw)
In-Reply-To: <20220819221731.480795-1-gpiccoli@igalia.com>

Currently the panic notifiers from user mode linux don't follow
the convention for most of the other notifiers present in the
kernel (indentation, priority setting, numeric return).
More important, the priorities could be improved, since it's a
special case (userspace), hence we could run the notifiers earlier;
user mode linux shouldn't care much with other panic notifiers but
the ordering among the mconsole and arch notifier is important,
given that the arch one effectively triggers a core dump.

Fix that by running the mconsole notifier as the first panic
notifier, followed by the architecture one (that coredumps).

Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>

V3:
- No changes.

V2:
- Kept the notifier header to avoid implicit usage - thanks
Johannes for the suggestion!
---
 arch/um/drivers/mconsole_kern.c | 7 +++----
 arch/um/kernel/um_arch.c        | 8 ++++----
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 8ca67a692683..69af3ce8407a 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -846,13 +846,12 @@ static int notify_panic(struct notifier_block *self, unsigned long unused1,
 
 	mconsole_notify(notify_socket, MCONSOLE_PANIC, message,
 			strlen(message) + 1);
-	return 0;
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block panic_exit_notifier = {
-	.notifier_call 		= notify_panic,
-	.next 			= NULL,
-	.priority 		= 1
+	.notifier_call	= notify_panic,
+	.priority	= INT_MAX, /* run as soon as possible */
 };
 
 static int add_notifier(void)
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index e0de60e503b9..ae272878f692 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -247,13 +247,13 @@ static int panic_exit(struct notifier_block *self, unsigned long unused1,
 	bust_spinlocks(0);
 	uml_exitcode = 1;
 	os_dump_core();
-	return 0;
+
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block panic_exit_notifier = {
-	.notifier_call 		= panic_exit,
-	.next 			= NULL,
-	.priority 		= 0
+	.notifier_call	= panic_exit,
+	.priority	= INT_MAX - 1, /* run as 2nd notifier, won't return */
 };
 
 void uml_finishsetup(void)
-- 
2.37.2


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

WARNING: multiple messages have this Message-ID (diff)
From: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
To: akpm@linux-foundation.org, bhe@redhat.com, pmladek@suse.com,
	kexec@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org,
	netdev@vger.kernel.org, x86@kernel.org, kernel-dev@igalia.com,
	kernel@gpiccoli.net, halves@canonical.com, fabiomirmar@gmail.com,
	alejandro.j.jimenez@oracle.com,
	andriy.shevchenko@linux.intel.com, arnd@arndb.de, bp@alien8.de,
	corbet@lwn.net, d.hatayama@jp.fujitsu.com,
	dave.hansen@linux.intel.com, dyoung@redhat.com,
	feng.tang@intel.com, gregkh@linuxfoundation.org,
	mikelley@microsoft.com, hidehiro.kawai.ez@hitachi.com,
	jgross@suse.com, john.ogness@linutronix.de,
	keescook@chromium.org, luto@kernel.org, mhiramat@kernel.org,
	mingo@redhat.com, paulmck@kernel.org, peterz@infradead.org,
	rostedt@goodmis.org, senozhatsky@chromium.org,
	stern@rowland.harvard.edu, tglx@linutronix.de, vgoyal@redhat.com,
	vkuznets@redhat.com, will@kernel.org, xuqiang36@huawei.com,
	"Guilherme G. Piccoli" <gpiccoli@igalia.com>,
	linux-um@lists.infradead.org,
	Anton Ivanov <anton.ivanov@cambridgegreys.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	Richard Weinberger <richard@nod.at>
Subject: [PATCH V3 04/11] um: Improve panic notifiers consistency and ordering
Date: Fri, 19 Aug 2022 19:17:24 -0300	[thread overview]
Message-ID: <20220819221731.480795-5-gpiccoli@igalia.com> (raw)
In-Reply-To: <20220819221731.480795-1-gpiccoli@igalia.com>

Currently the panic notifiers from user mode linux don't follow
the convention for most of the other notifiers present in the
kernel (indentation, priority setting, numeric return).
More important, the priorities could be improved, since it's a
special case (userspace), hence we could run the notifiers earlier;
user mode linux shouldn't care much with other panic notifiers but
the ordering among the mconsole and arch notifier is important,
given that the arch one effectively triggers a core dump.

Fix that by running the mconsole notifier as the first panic
notifier, followed by the architecture one (that coredumps).

Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>

V3:
- No changes.

V2:
- Kept the notifier header to avoid implicit usage - thanks
Johannes for the suggestion!
---
 arch/um/drivers/mconsole_kern.c | 7 +++----
 arch/um/kernel/um_arch.c        | 8 ++++----
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 8ca67a692683..69af3ce8407a 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -846,13 +846,12 @@ static int notify_panic(struct notifier_block *self, unsigned long unused1,
 
 	mconsole_notify(notify_socket, MCONSOLE_PANIC, message,
 			strlen(message) + 1);
-	return 0;
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block panic_exit_notifier = {
-	.notifier_call 		= notify_panic,
-	.next 			= NULL,
-	.priority 		= 1
+	.notifier_call	= notify_panic,
+	.priority	= INT_MAX, /* run as soon as possible */
 };
 
 static int add_notifier(void)
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index e0de60e503b9..ae272878f692 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -247,13 +247,13 @@ static int panic_exit(struct notifier_block *self, unsigned long unused1,
 	bust_spinlocks(0);
 	uml_exitcode = 1;
 	os_dump_core();
-	return 0;
+
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block panic_exit_notifier = {
-	.notifier_call 		= panic_exit,
-	.next 			= NULL,
-	.priority 		= 0
+	.notifier_call	= panic_exit,
+	.priority	= INT_MAX - 1, /* run as 2nd notifier, won't return */
 };
 
 void uml_finishsetup(void)
-- 
2.37.2


_______________________________________________
linux-um mailing list
linux-um@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-um


  parent reply	other threads:[~2022-08-19 22:21 UTC|newest]

Thread overview: 128+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-19 22:17 [PATCH V3 00/11] The panic notifiers refactor - fixes/clean-ups (V3) Guilherme G. Piccoli
2022-08-19 22:17 ` Guilherme G. Piccoli
2022-08-19 22:17 ` Guilherme G. Piccoli
2022-08-19 22:17 ` Guilherme G. Piccoli
2022-08-19 22:17 ` Guilherme G. Piccoli
2022-08-19 22:17 ` [PATCH V3 01/11] ARM: Disable FIQs (but not IRQs) on CPUs shutdown paths Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-09-18 13:58   ` Guilherme G. Piccoli
2022-09-18 13:58     ` Guilherme G. Piccoli
2022-09-18 13:58     ` Guilherme G. Piccoli
2022-10-17 14:00     ` Guilherme G. Piccoli
2022-10-17 14:00       ` Guilherme G. Piccoli
2022-10-17 14:00       ` Guilherme G. Piccoli
2022-10-17 14:17       ` Russell King (Oracle)
2022-10-17 14:17         ` Russell King (Oracle)
2022-10-17 14:17         ` Russell King (Oracle)
2022-10-17 14:50         ` Guilherme G. Piccoli
2022-10-17 14:50           ` Guilherme G. Piccoli
2022-10-17 14:50           ` Guilherme G. Piccoli
2022-10-17 17:47           ` Russell King (Oracle)
2022-10-17 17:47             ` Russell King (Oracle)
2022-10-17 17:47             ` Russell King (Oracle)
2022-10-17 19:43             ` Guilherme G. Piccoli
2022-10-17 19:43               ` Guilherme G. Piccoli
2022-10-17 19:43               ` Guilherme G. Piccoli
2022-08-19 22:17 ` [PATCH V3 02/11] notifier: Add panic notifiers info and purge trailing whitespaces Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-11-22 13:19   ` Guilherme G. Piccoli
2022-11-22 13:19     ` Guilherme G. Piccoli
2022-08-19 22:17 ` [PATCH V3 03/11] alpha: Clean-up the panic notifier code Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-11-22 13:22   ` Guilherme G. Piccoli
2022-11-22 13:22     ` Guilherme G. Piccoli
2022-11-22 13:22     ` Guilherme G. Piccoli
2022-08-19 22:17 ` Guilherme G. Piccoli [this message]
2022-08-19 22:17   ` [PATCH V3 04/11] um: Improve panic notifiers consistency and ordering Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-09-18 14:00   ` Guilherme G. Piccoli
2022-09-18 14:00     ` Guilherme G. Piccoli
2022-09-18 14:00     ` Guilherme G. Piccoli
2022-09-18 21:19     ` Richard Weinberger
2022-09-18 21:19       ` Richard Weinberger
2022-09-18 21:19       ` Richard Weinberger
2022-09-19 11:44       ` Guilherme G. Piccoli
2022-09-19 11:44         ` Guilherme G. Piccoli
2022-09-19 11:44         ` Guilherme G. Piccoli
2022-10-17 14:01       ` Guilherme G. Piccoli
2022-10-17 14:01         ` Guilherme G. Piccoli
2022-10-17 14:10         ` Richard Weinberger
2022-10-17 14:10           ` Richard Weinberger
2022-10-17 14:22           ` Guilherme G. Piccoli
2022-10-17 14:22             ` Guilherme G. Piccoli
2022-08-19 22:17 ` [PATCH V3 05/11] parisc: Replace regular spinlock with spin_trylock on panic path Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-08-19 22:17 ` [PATCH V3 06/11] tracing: Improve panic/die notifiers Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-09-18 14:04   ` Guilherme G. Piccoli
2022-09-18 14:04     ` Guilherme G. Piccoli
2022-10-17 14:02   ` Guilherme G. Piccoli
2022-10-17 14:02     ` Guilherme G. Piccoli
2022-10-20 21:29   ` Steven Rostedt
2022-10-20 21:29     ` Steven Rostedt
2022-10-20 21:53     ` Guilherme G. Piccoli
2022-10-20 21:53       ` Guilherme G. Piccoli
2022-10-20 22:22       ` Steven Rostedt
2022-10-20 22:22         ` Steven Rostedt
2022-10-20 22:37         ` Guilherme G. Piccoli
2022-10-20 22:37           ` Guilherme G. Piccoli
2022-11-22 13:27         ` Guilherme G. Piccoli
2022-11-22 13:27           ` Guilherme G. Piccoli
2022-12-13 23:51     ` Guilherme G. Piccoli
2022-12-13 23:51       ` Guilherme G. Piccoli
2022-12-14  0:06       ` Steven Rostedt
2022-12-14  0:06         ` Steven Rostedt
2022-12-14  0:52         ` Guilherme G. Piccoli
2022-12-14  0:52           ` Guilherme G. Piccoli
2022-08-19 22:17 ` [PATCH V3 07/11] notifiers: Add tracepoints to the notifiers infrastructure Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-09-18 14:07   ` Guilherme G. Piccoli
2022-09-18 14:07     ` Guilherme G. Piccoli
2022-10-17 14:04   ` Guilherme G. Piccoli
2022-10-17 14:04     ` Guilherme G. Piccoli
2022-11-22 13:30   ` Guilherme G. Piccoli
2022-11-22 13:30     ` Guilherme G. Piccoli
2022-08-19 22:17 ` [PATCH V3 08/11] EDAC/altera: Skip the panic notifier if kdump is loaded Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-09-18 14:10   ` Guilherme G. Piccoli
2022-09-18 14:10     ` Guilherme G. Piccoli
2022-10-17 14:05     ` Guilherme G. Piccoli
2022-10-17 14:05       ` Guilherme G. Piccoli
2022-11-22 13:33     ` Guilherme G. Piccoli
2022-11-22 13:33       ` Guilherme G. Piccoli
2022-11-22 15:06       ` Borislav Petkov
2022-11-22 15:06         ` Borislav Petkov
2023-02-10 16:01         ` Guilherme G. Piccoli
2023-02-10 16:01           ` Guilherme G. Piccoli
2022-12-09 16:03   ` Petr Mladek
2022-12-09 16:03     ` Petr Mladek
2022-08-19 22:17 ` [PATCH V3 09/11] video/hyperv_fb: Avoid taking busy spinlock on panic path Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-09-18 14:12   ` Guilherme G. Piccoli
2022-09-18 14:12     ` Guilherme G. Piccoli
2022-10-04 16:17   ` Michael Kelley (LINUX)
2022-10-04 16:17     ` Michael Kelley (LINUX)
2022-08-19 22:17 ` [PATCH V3 10/11] drivers/hv/vmbus, video/hyperv_fb: Untangle and refactor Hyper-V panic notifiers Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-10-04 16:24   ` Michael Kelley (LINUX)
2022-10-04 16:24     ` Michael Kelley (LINUX)
2022-10-04 17:20     ` Guilherme G. Piccoli
2022-10-04 17:20       ` Guilherme G. Piccoli
2022-10-17 15:26       ` Michael Kelley (LINUX)
2022-10-17 15:26         ` Michael Kelley (LINUX)
2022-11-10 21:32         ` Guilherme G. Piccoli
2022-11-10 21:32           ` Guilherme G. Piccoli
2022-11-11 22:47           ` Wei Liu
2022-11-11 22:47             ` Wei Liu
2022-11-11 23:16             ` Wei Liu
2022-11-11 23:16               ` Wei Liu
2022-11-12 21:53               ` Guilherme G. Piccoli
2022-11-12 21:53                 ` Guilherme G. Piccoli
2022-08-19 22:17 ` [PATCH V3 11/11] panic: Fixes the panic_print NMI backtrace setting Guilherme G. Piccoli
2022-08-19 22:17   ` Guilherme G. Piccoli
2022-09-18 14:13   ` Guilherme G. Piccoli
2022-09-18 14:13     ` Guilherme G. Piccoli
2022-11-22 13:35   ` Guilherme G. Piccoli
2022-11-22 13:35     ` Guilherme G. Piccoli

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