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debug: After reboot，the platform print a lot of logs Frequency [1/1]

Browse Source 
PD#SWPL-892

Problem:
We can see many user space unhandled page fault at 0 address:
such as
[  140.882524@2] Chrome_InProcGp: unhandled page fault (11) at
0x00000000, code 0x005
which seems to be triggered by user space on purpose

Solution:
Show debug infos only if this fault cannot be handled by user
space

Verify:
Locally on P212

Change-Id: I54e8256de2f5465e5dd0f8d90d9d9058fe67f808
Signed-off-by: jiamin ma <jiamin.ma@amlogic.com>
This commit is contained in:
jiamin ma
2018-10-22 09:02:52 +08:00
committed by Jiamin Ma
parent 254c5cce1c
commit c99b23299f
1 changed files with 6 additions and 2 deletions
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8
arch/arm/mm/fault.c
View File

@@ -238,8 +238,12 @@ __do_user_fault(struct task_struct *tsk, unsigned long addr,
struct siginfo si;
#ifdef CONFIG_DEBUG_USER
if (((user_debug & UDBG_SEGV) && (sig == SIGSEGV)) ||
((user_debug & UDBG_BUS) && (sig == SIGBUS))) {
if (
#ifdef CONFIG_AMLOGIC_USER_FAULT
unhandled_signal(tsk, sig) &&
#endif
(((user_debug & UDBG_SEGV) && (sig == SIGSEGV)) ||
((user_debug & UDBG_BUS) && (sig == SIGBUS)))) {
#ifdef CONFIG_AMLOGIC_USER_FAULT
pr_info("%s: unhandled page fault (%d) at 0x%08lx, code 0x%03x\n",
tsk->comm, sig, addr, fsr);