linux-kernel - Re: [PATCH V3 0/6] ARM64: Uprobe support added

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Date:   Mon, 7 Nov 2016 11:39:47 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Pratyush Anand <panand@...hat.com>
Cc:     steve.capper@...aro.org, srikar@...ux.vnet.ibm.com,
        vijaya.kumar@...iumnetworks.com, will.deacon@....com,
        oleg@...hat.com, linux-kernel@...r.kernel.org, wcohen@...hat.com,
        linux-arm-kernel@...ts.infradead.org, dave.long@...hat.com
Subject: Re: [PATCH V3 0/6] ARM64: Uprobe support added

On Sat, Nov 05, 2016 at 11:01:31AM +0530, Pratyush Anand wrote:
> On Saturday 05 November 2016 12:16 AM, Catalin Marinas wrote:
> > On Fri, Nov 04, 2016 at 11:49:51AM -0600, Catalin Marinas wrote:
> > > On Wed, Nov 02, 2016 at 02:40:40PM +0530, Pratyush Anand wrote:
> > > > Pratyush Anand (6):
> > > >   arm64: kprobe: protect/rename few definitions to be reused by uprobe
> > > >   arm64: kgdb_step_brk_fn: ignore other's exception
> > > >   arm64: Handle TRAP_TRACE for user mode as well
> > > >   arm64: Handle TRAP_BRKPT for user mode as well
> > > >   arm64: introduce mm context flag to keep 32 bit task information
> > > >   arm64: Add uprobe support
> > > 
> > > I queued the patches for 4.10. I will push them into -next sometime next
> > > week once I do some testing (I'm currently at the LPC).
> > 
> > I spoke too soon. With these patches on top of 4.9-rc3, defconfig
> > together with FTRACE and UPROBE_EVENT enabled I get:
> > 
> > In file included from /work/Linux/linux-2.6-aarch64/arch/arm64/kernel/probes/decode-insn.c:20:0:
> > /work/Linux/linux-2.6-aarch64/arch/arm64/include/asm/kprobes.h:52:5: error: conflicting types for 'kprobe_fault_handler'
> >  int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
> >      ^~~~~~~~~~~~~~~~~~~~
> > In file included from /work/Linux/linux-2.6-aarch64/arch/arm64/kernel/probes/decode-insn.c:17:0:
> > /work/Linux/linux-2.6-aarch64/include/linux/kprobes.h:398:90: note: previous definition of 'kprobe_fault_handler' was here
> >  static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
> >                                                                                           ^
> > /work/Linux/linux-2.6-aarch64/scripts/Makefile.build:290: recipe for target 'arch/arm64/kernel/probes/decode-insn.o' failed
> 
> Hummmm...CONFIG_KPROBE was defined in my setup and did not notice it :( . We
> need to remove #include <asm/kprobes.h> from
> /arch/arm64/kernel/probes/decode-insn.c.
> <asm/kprobes.h> is already included from <linux/kprobes.h> under #ifdef
> CONFIG_KPROBE.
> 
> diff --git a/arch/arm64/kernel/probes/decode-insn.c
> b/arch/arm64/kernel/probes/decode-insn.c
> index 8a29d29..6bf6657 100644
> --- a/arch/arm64/kernel/probes/decode-insn.c
> +++ b/arch/arm64/kernel/probes/decode-insn.c
> @@ -17,7 +17,6 @@
>  #include <linux/kprobes.h>
>  #include <linux/module.h>
>  #include <linux/kallsyms.h>
> -#include <asm/kprobes.h>
>  #include <asm/insn.h>
>  #include <asm/sections.h>
> 
> So, do you want me to send V4 or a separate topup fixup patch. Please let me
> know, will do accordingly.

Just a separate patch on top of your series would do. Also please test
your series with CONFIG_KPROBE disabled and I assume this wasn't done
(just in case there is an interaction we were not aware of).

Thanks.

-- 
Catalin