Re: [PATCH] mm: Generalize and rename notify_page_fault() as kprobe_page_fault()

From: Guenter Roeck <linux@roeck-us.net>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Michal Hocko <mhocko@suse.com>,
	linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	James Hogan <jhogan@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Will Deacon <will.deacon@arm.com>,
	linux-mips@vger.kernel.org, linux-mm@kvack.org,
	Paul Mackerras <paulus@samba.org>,
	sparclinux@vger.kernel.org,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Michael Ellerman <mpe@ellerman.id.au>,
	x86@kernel.org, Russell King <linux@armlinux.org.uk>,
	Matthew Wilcox <willy@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	linux-snps-arc@lists.infradead.org,
	Fenghua Yu <fenghua.yu@intel.com>,
	linux-s390@vger.kernel.org,
	Andrey Konovalov <andreyknvl@google.com>,
	Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel@lists.infradead.org,
	Christophe Leroy <christophe.leroy@c-s.fr>,
	Tony Luck <tony.luck@intel.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Vineet Gupta <vgupta@synopsys.com>,
	linux-kernel@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
	Paul Burton <paul.burton@mips.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH] mm: Generalize and rename notify_page_fault() as kprobe_page_fault()
Date: Sat, 29 Jun 2019 07:50:09 -0700	[thread overview]
Message-ID: <20190629145009.GA28613@roeck-us.net> (raw)
In-Reply-To: <1560420444-25737-1-git-send-email-anshuman.khandual@arm.com>

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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