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>,
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>,
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Andrey Konovalov <andreyknvl@google•com>,
Andy Lutomirski <luto@kernel•org>,
Thomas Gleixner <tglx@linutronix•de>,
linux-arm-kernel@lists•infradead.org,
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
next prev parent reply other threads:[~2019-06-29 14:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-13 10:07 [PATCH] mm: Generalize and rename notify_page_fault() as kprobe_page_fault() Anshuman Khandual
2019-06-13 20:04 ` Andrew Morton
2019-06-14 5:15 ` Anshuman Khandual
2019-06-29 14:50 ` Guenter Roeck [this message]
2019-06-30 4:41 ` Anshuman Khandual
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