Hi,

On Thu, Jun 13, 2019 at 03:37:24PM +0530, Anshuman Khandual wrote:

Architectures which support kprobes have very similar boilerplate around
calling kprobe_fault_handler(). Use a helper function in kprobes.h to unify
them, based on the x86 code.

This changes the behaviour for other architectures when preemption is
enabled. Previously, they would have disabled preemption while calling the
kprobe handler. However, preemption would be disabled if this fault was
due to a kprobe, so we know the fault was not due to a kprobe handler and
can simply return failure.

This behaviour was introduced in the commit a980c0ef9f6d ("x86/kprobes:
Refactor kprobes_fault() like kprobe_exceptions_notify()")

With this patch applied, parisc:allmodconfig images no longer build.

In file included from arch/parisc/mm/fixmap.c:8:
include/linux/kprobes.h: In function 'kprobe_page_fault':
include/linux/kprobes.h:477:9: error:
	implicit declaration of function 'kprobe_fault_handler'; did you mean 'kprobe_page_fault'?

Reverting the patch fixes the problem.

Guenter

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