printk: declare printk_deferred_{enter,safe}() in include/linux/printk.h

stable inclusion
from stable-v4.19.283
commit 09b28fe9ff2fce03efc7d71dc79b58a49b01d0e9
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7BZ5U
CVE: NA

--------------------------------

commit 85e3e7fb upstream.

[This patch implements subset of original commit 85e3e7fb ("printk:
remove NMI tracking") where commit 1007843a ("mm/page_alloc: fix
potential deadlock on zonelist_update_seq seqlock") depends on, for
commit 3d36424b ("mm/page_alloc: fix race condition between
build_all_zonelists and page allocation") was backported to stable.]

All NMI contexts are handled the same as the safe context: store the
message and defer printing. There is no need to have special NMI
context tracking for this. Using in_nmi() is enough.

There are several parts of the kernel that are manually calling into
the printk NMI context tracking in order to cause general printk
deferred printing:

    arch/arm/kernel/smp.c
    arch/powerpc/kexec/crash.c
    kernel/trace/trace.c

For arm/kernel/smp.c and powerpc/kexec/crash.c, provide a new
function pair printk_deferred_enter/exit that explicitly achieves the
same objective.

For ftrace, remove the printk context manipulation completely. It was
added in commit 03fc7f9c ("printk/nmi: Prevent deadlock when
accessing the main log buffer in NMI"). The purpose was to enforce
storing messages directly into the ring buffer even in NMI context.
It really should have only modified the behavior in NMI context.
There is no need for a special behavior any longer. All messages are
always stored directly now. The console deferring is handled
transparently in vprintk().
Signed-off-by: NJohn Ogness <john.ogness@linutronix.de>
[pmladek@suse.com: Remove special handling in ftrace.c completely.
Signed-off-by: NPetr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210715193359.25946-5-john.ogness@linutronix.de
[penguin-kernel: Copy only printk_deferred_{enter,safe}() definition ]
Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Conflicts:
	include/linux/printk.h
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>
Reviewed-by: NNanyong Sun <sunnanyong@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

include/linux/printk.h

@@ -570,4 +570,23 @@ static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
 }
 #endif
 
+#ifdef CONFIG_PRINTK
+extern void printk_safe_enter(void);
+extern void printk_safe_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
+#else
+static inline void printk_deferred_enter(void)
+{
+}
+static inline void printk_deferred_exit(void)
+{
+}
+#endif
+
 #endif