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

Michael Ellerman patch-notifications at ellerman.id.au
Wed Mar 14 20:28:31 AEDT 2018

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 <vaibhav at linux.vnet.ibm.com>
> Reviewed-by: Balbir Singh <bsingharora at gmail.com>

Applied to powerpc next, thanks.



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