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From: John Ogness <john.ogness@linutronix.de>
Date: Wed, 20 Apr 2022 01:52:24 +0206
Subject: [PATCH 02/18] printk: cpu sync always disable interrupts
The CPU sync functions are a NOP for !CONFIG_SMP. But for
!CONFIG_SMP they still need to disable interrupts in order to
preserve context within the CPU sync sections.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20220419234637.357112-3-john.ogness@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/printk.h | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -281,9 +281,16 @@ extern int __printk_cpu_sync_try_get(voi
extern void __printk_cpu_sync_wait(void);
extern void __printk_cpu_sync_put(void);
+#else
+
+#define __printk_cpu_sync_try_get() true
+#define __printk_cpu_sync_wait()
+#define __printk_cpu_sync_put()
+#endif /* CONFIG_SMP */
+
/**
- * printk_cpu_sync_get_irqsave() - Acquire the printk cpu-reentrant spinning
- * lock and disable interrupts.
+ * printk_cpu_sync_get_irqsave() - Disable interrupts and acquire the printk
+ * cpu-reentrant spinning lock.
* @flags: Stack-allocated storage for saving local interrupt state,
* to be passed to printk_cpu_sync_put_irqrestore().
*
@@ -322,13 +329,6 @@ extern void __printk_cpu_sync_put(void);
local_irq_restore(flags); \
} while (0)
-#else
-
-#define printk_cpu_sync_get_irqsave(flags) ((void)flags)
-#define printk_cpu_sync_put_irqrestore(flags) ((void)flags)
-
-#endif /* CONFIG_SMP */
-
extern int kptr_restrict;
/**
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