From 0e96a19c4450253c3ddcff69140b1096f2c2adaf Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky Date: Tue, 2 Oct 2018 11:38:36 +0900 Subject: printk: do not preliminary split up cont buffer We have a proper 'overflow' check which tells us that we need to split up existing cont buffer in separate records: if (cont.len + len > sizeof(cont.buf)) cont_flush(); At the same time we also have one extra flush: "if cont buffer is 80% full then split it up" in cont_add(): if (cont.len > (sizeof(cont.buf) * 80) / 100) cont_flush(); This looks to be redundant, since the existing "overflow" check should work just fine, so remove this 80% check and wait for either a normal cont termination \n, for preliminary flush due to possible buffer overflow or for preliminary flush due to cont race. Link: http://lkml.kernel.org/r/20181002023836.4487-4-sergey.senozhatsky@gmail.com To: Steven Rostedt Cc: Andrew Morton Cc: Dmitriy Vyukov Cc: Tetsuo Handa Cc: Tejun Heo Cc: Peter Zijlstra Cc: LKML Cc: Sergey Senozhatsky Signed-off-by: Sergey Senozhatsky Signed-off-by: Petr Mladek --- kernel/printk/printk.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'kernel/printk') diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index e9a7e50ed60a..505663bb4f1f 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1796,9 +1796,6 @@ static bool cont_add(int facility, int level, enum log_flags flags, const char * cont_flush(); } - if (cont.len > (sizeof(cont.buf) * 80) / 100) - cont_flush(); - return true; } -- cgit v1.2.3-55-g7522