A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 18:51:56 -04:00
Code Issues Projects Releases Packages Wiki Activity

printk: always use deferred printk when flush printk_safe lines

Browse source 
Always use printk_deferred() in printk_safe_flush_line().
Flushing can be done from NMI or printk_safe contexts (when
we are in panic), so we can't call console drivers, yet still
want to store the messages in the logbuf buffer. Therefore we
use a deferred printk version.

Link: http://lkml.kernel.org/r/[email protected]
Cc: Andrew Morton <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Calvin Owens <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Peter Hurley <[email protected]>
Cc: [email protected]
Signed-off-by: Sergey Senozhatsky <[email protected]>
Suggested-by: Petr Mladek <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Reviewed-by: Steven Rostedt (VMware) <[email protected]>
This commit is contained in:
Sergey Senozhatsky 2017-02-07 01:42:53 +09:00 • committed by Petr Mladek
commit 7acac3445a
1 changed files with 6 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

14
kernel/printk/printk_safe.c
View file

@ -110,17 +110,15 @@ again:
return add;
}
static void printk_safe_flush_line(const char *text, int len)
static inline void printk_safe_flush_line(const char *text, int len)
{
/*
* The buffers are flushed in NMI only on panic. The messages must
* go only into the ring buffer at this stage. Consoles will get
* explicitly called later when a crashdump is not generated.
* Avoid any console drivers calls from here, because we may be
* in NMI or printk_safe context (when in panic). The messages
* must go only into the ring buffer at this stage. Consoles will
* get explicitly called later when a crashdump is not generated.
*/
if (in_nmi())
printk_deferred("%.*s", len, text);
else
printk("%.*s", len, text);
printk_deferred("%.*s", len, text);
}
/* printk part of the temporary buffer line by line */