Re: [PATCH 3/3] printk: Avoid softlockups in console_unlock()

2013-02-18 Thread Jan Kara
On Fri 15-02-13 14:22:19, Andrew Morton wrote: > On Fri, 15 Feb 2013 17:57:10 +0100 > Jan Kara wrote: > > > A CPU can be caught in console_unlock() for a long time (tens of seconds are > > reported by our customers) when other CPUs are using printk heavily and > > serial > > console makes printi

Re: [PATCH 3/3] printk: Avoid softlockups in console_unlock()

2013-02-15 Thread Andrew Morton
On Fri, 15 Feb 2013 17:57:10 +0100 Jan Kara wrote: > A CPU can be caught in console_unlock() for a long time (tens of seconds are > reported by our customers) when other CPUs are using printk heavily and serial > console makes printing slow. Despite serial console drivers are calling > touch_nmi_

[PATCH 3/3] printk: Avoid softlockups in console_unlock()

2013-02-15 Thread Jan Kara
A CPU can be caught in console_unlock() for a long time (tens of seconds are reported by our customers) when other CPUs are using printk heavily and serial console makes printing slow. Despite serial console drivers are calling touch_nmi_watchdog() this triggers softlockup warnings because interrup