diff options
Diffstat (limited to 'debian/patches-rt/0004-printk-Check-printk_deferred_enter-_exit-usage.patch')
-rw-r--r-- | debian/patches-rt/0004-printk-Check-printk_deferred_enter-_exit-usage.patch | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/debian/patches-rt/0004-printk-Check-printk_deferred_enter-_exit-usage.patch b/debian/patches-rt/0004-printk-Check-printk_deferred_enter-_exit-usage.patch new file mode 100644 index 0000000000..4cde1a93e9 --- /dev/null +++ b/debian/patches-rt/0004-printk-Check-printk_deferred_enter-_exit-usage.patch @@ -0,0 +1,74 @@ +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Fri, 22 Sep 2023 14:58:18 +0000 +Subject: [PATCH 04/46] printk: Check printk_deferred_enter()/_exit() usage +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.9/older/patches-6.9-rt5.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> +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 +@@ -157,15 +157,16 @@ 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 |