lkml.org 
[lkml]   [2017]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] powerpc/xmon: Fix an unexpected xmon onoff state change
From
Date


在 2017/2/17 14:05, Michael Ellerman 写道:
> Pan Xinhui <xinhui@linux.vnet.ibm.com> writes:
>> diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
>> index 9c0e17c..f6e5c3d 100644
>> --- a/arch/powerpc/xmon/xmon.c
>> +++ b/arch/powerpc/xmon/xmon.c
>> @@ -76,6 +76,7 @@ static int xmon_gate;
>> #endif /* CONFIG_SMP */
>>
>> static unsigned long in_xmon __read_mostly = 0;
>> +static int xmon_off = !IS_ENABLED(CONFIG_XMON_DEFAULT);
>
> I think the logic would probably clearer if we invert this to become
> xmon_on.
>
yep, make sense.

>> @@ -3266,16 +3269,16 @@ static int __init setup_xmon_sysrq(void)
>> __initcall(setup_xmon_sysrq);
>> #endif /* CONFIG_MAGIC_SYSRQ */
>>
>> -static int __initdata xmon_early, xmon_off;
>> +static int __initdata xmon_early;
>>
>> static int __init early_parse_xmon(char *p)
>> {
>> if (!p || strncmp(p, "early", 5) == 0) {
>> /* just "xmon" is equivalent to "xmon=early" */
>> - xmon_init(1);
>> xmon_early = 1;
>> + xmon_off = 0;
>> } else if (strncmp(p, "on", 2) == 0)
>> - xmon_init(1);
>> + xmon_off = 0;
>
> You've just changed the timing of when xmon gets enabled for the above
> two cases, from here which is called very early, to xmon_setup() which
> is called much later in boot.
>
> That effectively disables xmon for most of the boot, which we do not
> want to do.
>
Although it is not often that kernel got stucked during boot. Yes, the behavior changed anyway. Will fix that in v3.

> cheers
>

\
 
 \ /
  Last update: 2017-02-17 10:31    [W:0.456 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site