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SubjectRe: [PATCH v2] powerpc/fadump: return error when fadump registration fails
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On 05/27/2017 09:16 PM, Michal Suchanek wrote:
> - log an error message when registration fails and no error code listed
> in the switch is returned
> - translate the hv error code to posix error code and return it from
> fw_register
> - return the posix error code from fw_register to the process writing
> to sysfs
> - return EEXIST on re-registration
> - return success on deregistration when fadump is not registered
> - return ENODEV when no memory is reserved for fadump

Why do we need this ? Userspace can always read back the fadump
registration status from /sys/kernel/fadump_registered (after echo 1 to
it) to find out whether fadump registration succeeded or not.

/sys/kernel/fadump_registered

This is used to display the fadump registration status as well
as to control (start/stop) the fadump registration.
0 = fadump is not registered.
1 = fadump is registered and ready to handle system crash.

-Mahesh.

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