linux-kernel - [PATCH v5] alpha: Clean-up the panic notifier code

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Message-ID: <20230902165725.3504046-1-gpiccoli@igalia.com>
Date:   Sat,  2 Sep 2023 13:44:15 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     linux-alpha@...r.kernel.org, mattst88@...il.com
Cc:     linux-kernel@...r.kernel.org, kernel-dev@...lia.com,
        kernel@...ccoli.net, "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Richard Henderson <richard.henderson@...aro.org>,
        Petr Mladek <pmladek@...e.com>
Subject: [PATCH v5] alpha: Clean-up the panic notifier code

The alpha panic notifier has some code issues, not following
the conventions of other notifiers. Also, it might halt the
machine but still it is set to run as early as possible, which
doesn't seem to be a good idea.

So, let's clean the code and set the notifier to run as the
latest, following the same approach other architectures are
doing - also, remove the unnecessary include of a header already
included indirectly.

Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
Cc: Matt Turner <mattst88@...il.com>
Cc: Richard Henderson <richard.henderson@...aro.org>
Reviewed-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
---

V5: rebased against v6.5, build-tested using defconfig.

V4: https://lore.kernel.org/lkml/20230220212245.153554-1-gpiccoli@igalia.com/

Hi Matt, apologies for the annoyance. Seems that this one was never picked-up;
let me know if there's anything missing.

Thanks in advance,

Guilherme


 arch/alpha/kernel/setup.c | 36 +++++++++++++++---------------------
 1 file changed, 15 insertions(+), 21 deletions(-)

diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index 3d7473531ab1..07afd2bf18d7 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -41,19 +41,11 @@
 #include <linux/sysrq.h>
 #include <linux/reboot.h>
 #endif
-#include <linux/notifier.h>
 #include <asm/setup.h>
 #include <asm/io.h>
 #include <linux/log2.h>
 #include <linux/export.h>
 
-static int alpha_panic_event(struct notifier_block *, unsigned long, void *);
-static struct notifier_block alpha_panic_block = {
-	alpha_panic_event,
-        NULL,
-        INT_MAX /* try to do it first */
-};
-
 #include <linux/uaccess.h>
 #include <asm/hwrpb.h>
 #include <asm/dma.h>
@@ -434,6 +426,21 @@ static const struct sysrq_key_op srm_sysrq_reboot_op = {
 };
 #endif
 
+static int alpha_panic_event(struct notifier_block *this,
+			     unsigned long event, void *ptr)
+{
+	/* If we are using SRM and serial console, just hard halt here. */
+	if (alpha_using_srm && srmcons_output)
+		__halt();
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block alpha_panic_block = {
+	.notifier_call = alpha_panic_event,
+	.priority = INT_MIN, /* may not return, do it last */
+};
+
 void __init
 setup_arch(char **cmdline_p)
 {
@@ -1426,19 +1433,6 @@ const struct seq_operations cpuinfo_op = {
 	.show	= show_cpuinfo,
 };
 
-
-static int
-alpha_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
-{
-#if 1
-	/* FIXME FIXME FIXME */
-	/* If we are using SRM and serial console, just hard halt here. */
-	if (alpha_using_srm && srmcons_output)
-		__halt();
-#endif
-        return NOTIFY_DONE;
-}
-
 static __init int add_pcspkr(void)
 {
 	struct platform_device *pd;
-- 
2.41.0