linux-kernel - [PATCH RFC 1/5] dump_stack: Make arch description buffer __ro_after

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Date: Thu, 18 Jan 2024 09:25:12 -0600
From: Nathan Lynch via B4 Relay <devnull+nathanl.linux.ibm.com@...nel.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>, 
 "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>, 
 Brian King <brking@...ux.ibm.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 John Ogness <john.ogness@...utronix.de>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Petr Mladek <pmladek@...e.com>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>, 
 Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
 Nathan Lynch <nathanl@...ux.ibm.com>
Subject: [PATCH RFC 1/5] dump_stack: Make arch description buffer
 __ro_after_init

From: Nathan Lynch <nathanl@...ux.ibm.com>

The static hardware description buffer is populated by arch code
during boot and should not change afterwards, so mark it
__ro_after_init.

Signed-off-by: Nathan Lynch <nathanl@...ux.ibm.com>
---
 lib/dump_stack.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/dump_stack.c b/lib/dump_stack.c
index 83471e81501a..1057f102f6f2 100644
--- a/lib/dump_stack.c
+++ b/lib/dump_stack.c
@@ -6,6 +6,7 @@

 #include <linux/kernel.h>
 #include <linux/buildid.h>
+#include <linux/cache.h>
 #include <linux/export.h>
 #include <linux/sched.h>
 #include <linux/sched/debug.h>
@@ -15,7 +16,7 @@
 #include <linux/utsname.h>
 #include <linux/stop_machine.h>

-static char dump_stack_arch_desc_str[128];
+static char dump_stack_arch_desc_str[128] __ro_after_init;

 /**
  * dump_stack_set_arch_desc - set arch-specific str to show with task dumps

-- 
2.43.0