Konstantin Demin
c3d09a3e94
imported from https://salsa.debian.org/kernel-team/linux.git commit 9d5cc9d9d6501d7f1dd7e194d4b245bd0b6c6a22 version 6.11.4-1
77 lines
2.5 KiB
Diff
77 lines
2.5 KiB
Diff
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
Date: Tue, 20 Aug 2024 08:35:30 +0206
|
|
Subject: [PATCH 04/54] printk: Check printk_deferred_enter()/_exit() usage
|
|
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.11/older/patches-6.11-rt7.tar.xz
|
|
|
|
Add validation that printk_deferred_enter()/_exit() are called in
|
|
non-migration contexts.
|
|
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
Signed-off-by: John Ogness <john.ogness@linutronix.de>
|
|
Reviewed-by: Petr Mladek <pmladek@suse.com>
|
|
Link: https://lore.kernel.org/r/20240820063001.36405-5-john.ogness@linutronix.de
|
|
Signed-off-by: Petr Mladek <pmladek@suse.com>
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
---
|
|
include/linux/printk.h | 9 +++++----
|
|
kernel/printk/internal.h | 3 +++
|
|
kernel/printk/printk_safe.c | 12 ++++++++++++
|
|
3 files changed, 20 insertions(+), 4 deletions(-)
|
|
|
|
--- a/include/linux/printk.h
|
|
+++ b/include/linux/printk.h
|
|
@@ -161,15 +161,16 @@ int _printk(const char *fmt, ...);
|
|
*/
|
|
__printf(1, 2) __cold int _printk_deferred(const char *fmt, ...);
|
|
|
|
-extern void __printk_safe_enter(void);
|
|
-extern void __printk_safe_exit(void);
|
|
+extern void __printk_deferred_enter(void);
|
|
+extern void __printk_deferred_exit(void);
|
|
+
|
|
/*
|
|
* The printk_deferred_enter/exit macros are available only as a hack for
|
|
* some code paths that need to defer all printk console printing. Interrupts
|
|
* must be disabled for the deferred duration.
|
|
*/
|
|
-#define printk_deferred_enter __printk_safe_enter
|
|
-#define printk_deferred_exit __printk_safe_exit
|
|
+#define printk_deferred_enter() __printk_deferred_enter()
|
|
+#define printk_deferred_exit() __printk_deferred_exit()
|
|
|
|
/*
|
|
* Please don't use printk_ratelimit(), because it shares ratelimiting state
|
|
--- a/kernel/printk/internal.h
|
|
+++ b/kernel/printk/internal.h
|
|
@@ -53,6 +53,9 @@ int vprintk_store(int facility, int leve
|
|
__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
|
|
__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
|
|
|
|
+void __printk_safe_enter(void);
|
|
+void __printk_safe_exit(void);
|
|
+
|
|
bool printk_percpu_data_ready(void);
|
|
|
|
#define printk_safe_enter_irqsave(flags) \
|
|
--- a/kernel/printk/printk_safe.c
|
|
+++ b/kernel/printk/printk_safe.c
|
|
@@ -26,6 +26,18 @@ void __printk_safe_exit(void)
|
|
this_cpu_dec(printk_context);
|
|
}
|
|
|
|
+void __printk_deferred_enter(void)
|
|
+{
|
|
+ cant_migrate();
|
|
+ __printk_safe_enter();
|
|
+}
|
|
+
|
|
+void __printk_deferred_exit(void)
|
|
+{
|
|
+ cant_migrate();
|
|
+ __printk_safe_exit();
|
|
+}
|
|
+
|
|
asmlinkage int vprintk(const char *fmt, va_list args)
|
|
{
|
|
#ifdef CONFIG_KGDB_KDB
|