Re: [PATCH] move die notifier handling to common code

[Paul Mackerras <paulus@samba.org>]

Christoph Hellwig writes:

> This patch moves the die notifier handling to common code.  Previous
> various architectures had exactly the same code for it.  Note that
> the new code is compiled unconditionally, this should be understood
> as an appel to the other architecture maintainer to implement
> support for it aswell (aka sprinkling a notify_die or two in the
> proper place)

Seems OK, although I think kprobes should not be using notify_die.
The set of events that kprobes is interested in has no intersection at
all with the set that any other consumer of the notify_die events is
interested in, on any architecture.

Furthermore, the multiplexing of the kprobes events through notify_die
really serves no useful purpose.  It just means that
kprobe_exceptions_notify has to demultiplex the events with a switch
statement.  There is no significant common code for all events in
kprobe_exceptions_notify, just a simple check whether the event
happened in user mode.

However, all that is in arch code so can be changed per-arch if
desired.

Paul.