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Date: Tue, 7 Jul 2020 17:05:31 +0206 From: John Ogness <john.ogness@...utronix.de> To: Petr Mladek <pmladek@...e.com> Cc: Peter Zijlstra <peterz@...radead.org>, Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, Steven Rostedt <rostedt@...dmis.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Andrea Parri <parri.andrea@...il.com>, Thomas Gleixner <tglx@...utronix.de>, Paul McKenney <paulmck@...nel.org>, kexec@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: [PATCH v4 3/4] Revert "printk: lock/unlock console only for new logbuf entries" This reverts commit 3ac37a93fa9217e576bebfd4ba3e80edaaeb2289. This optimization will not apply once the transition to a lockless printk is complete. Rather than porting this optimization through the transition only to remove it anyway, just revert it now to simplify the transition. Signed-off-by: John Ogness <john.ogness@...utronix.de> --- kernel/printk/printk.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index b71eaf5f5a86..1b41e1b98221 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1981,9 +1981,8 @@ asmlinkage int vprintk_emit(int facility, int level, const char *fmt, va_list args) { int printed_len; - bool in_sched = false, pending_output; + bool in_sched = false; unsigned long flags; - u64 curr_log_seq; /* Suppress unimportant messages after panic happens */ if (unlikely(suppress_printk)) @@ -1999,13 +1998,11 @@ asmlinkage int vprintk_emit(int facility, int level, /* This stops the holder of console_sem just where we want him */ logbuf_lock_irqsave(flags); - curr_log_seq = log_next_seq; printed_len = vprintk_store(facility, level, dict, dictlen, fmt, args); - pending_output = (curr_log_seq != log_next_seq); logbuf_unlock_irqrestore(flags); /* If called from the scheduler, we can not call up(). */ - if (!in_sched && pending_output) { + if (!in_sched) { /* * Disable preemption to avoid being preempted while holding * console_sem which would prevent anyone from printing to @@ -2022,8 +2019,7 @@ asmlinkage int vprintk_emit(int facility, int level, preempt_enable(); } - if (pending_output) - wake_up_klogd(); + wake_up_klogd(); return printed_len; } EXPORT_SYMBOL(vprintk_emit); -- 2.20.1
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