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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-07 01:04:55 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-07 01:04:55 +0200 |
commit | d75ae5bdf2353e5c6a1f83da5f6f2d31582f09a3 (patch) | |
tree | de5fc796d1148baaca18497b6f62cc58a6f742e6 /kernel/printk/printk.c | |
parent | Merge tag 'for-linus-4.18' of git://github.com/cminyard/linux-ipmi (diff) | |
parent | Merge branch 'for-4.18-vsprintf-pcr-removal' into for-4.18 (diff) | |
download | linux-d75ae5bdf2353e5c6a1f83da5f6f2d31582f09a3.tar.xz linux-d75ae5bdf2353e5c6a1f83da5f6f2d31582f09a3.zip |
Merge tag 'printk-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk
Pull printk updates from Petr Mladek:
- Help userspace log daemons to catch up with a flood of messages. They
will get woken after each message even if the console is far behind
and handled by another process.
- Flush printk safe buffers safely even when panic() happens in the
normal context.
- Fix possible va_list reuse when race happened in printk_safe().
- Remove %pCr printf format to prevent sleeping in the atomic context.
- Misc vsprintf code cleanup.
* tag 'printk-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
printk: drop in_nmi check from printk_safe_flush_on_panic()
lib/vsprintf: Remove atomic-unsafe support for %pCr
serial: sh-sci: Stop using printk format %pCr
thermal: bcm2835: Stop using printk format %pCr
clk: renesas: cpg-mssr: Stop using printk format %pCr
printk: fix possible reuse of va_list variable
printk: wake up klogd in vprintk_emit
vsprintf: Tweak pF/pf comment
lib/vsprintf: Mark expected switch fall-through
lib/vsprintf: Replace space with '_' before crng is ready
lib/vsprintf: Deduplicate pointer_string()
lib/vsprintf: Move pointer_string() upper
lib/vsprintf: Make flag_spec global
lib/vsprintf: Make strspec global
lib/vsprintf: Make dec_spec global
lib/test_printf: Mark big constant with UL
Diffstat (limited to 'kernel/printk/printk.c')
-rw-r--r-- | kernel/printk/printk.c | 14 |
1 files changed, 2 insertions, 12 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 2f4af216bd6e..247808333ba4 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1908,6 +1908,7 @@ asmlinkage int vprintk_emit(int facility, int level, preempt_enable(); } + wake_up_klogd(); return printed_len; } EXPORT_SYMBOL(vprintk_emit); @@ -2289,9 +2290,7 @@ void console_unlock(void) { static char ext_text[CONSOLE_EXT_LOG_MAX]; static char text[LOG_LINE_MAX + PREFIX_MAX]; - static u64 seen_seq; unsigned long flags; - bool wake_klogd = false; bool do_cond_resched, retry; if (console_suspended) { @@ -2335,11 +2334,6 @@ again: printk_safe_enter_irqsave(flags); raw_spin_lock(&logbuf_lock); - if (seen_seq != log_next_seq) { - wake_klogd = true; - seen_seq = log_next_seq; - } - if (console_seq < log_first_seq) { len = sprintf(text, "** %u printk messages dropped **\n", (unsigned)(log_first_seq - console_seq)); @@ -2397,7 +2391,7 @@ skip: if (console_lock_spinning_disable_and_check()) { printk_safe_exit_irqrestore(flags); - goto out; + return; } printk_safe_exit_irqrestore(flags); @@ -2429,10 +2423,6 @@ skip: if (retry && console_trylock()) goto again; - -out: - if (wake_klogd) - wake_up_klogd(); } EXPORT_SYMBOL(console_unlock); |