Subject: Re: [v2] xmon: Setup xmon debugger hooks when first break-point is set

From: Michael Ellerman <[email-masked]>
Date: Wed, 14 Mar 2018 20:28:31 +1100 (AEDT)

On Sun, 2018-03-04 at 17:30:25 UTC, Vaibhav Jain wrote:
> Presently sysrq key for xmon('x') is registered during kernel init
> irrespective of the value of kernel param 'xmon'. Thus xmon is enabled
> even if 'xmon=off' is passed on the kernel command line. However this
> doesn't enable the kernel debugger hooks needed for instruction or data
> breakpoints. Thus when a break-point is hit with xmon=off a kernel oops
> of the form below is reported:
> 
> Oops: Exception in kernel mode, sig: 5 [#1]
> < snip >
> Trace/breakpoint trap
> 
> To fix this the patch checks and enables debugger hooks when an
> instruction or data break-point is set via xmon console.
> 
> Signed-off-by: Vaibhav Jain <[email-masked]>
> Reviewed-by: Balbir Singh <[email-masked]>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e1368d0c9edbc366e45216e7295fd6

cheers