linux-kernel - Re: [PATCH v5 10/13] powerpc/ptrace: split out ADV_DEBUG

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Message-ID: <e2e02786-1b6c-7e91-6768-60563ad21505@c-s.fr>
Date:   Thu, 26 Mar 2020 13:53:31 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, mikey@...ling.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 10/13] powerpc/ptrace: split out ADV_DEBUG_REGS related
 functions.



Le 24/03/2020 à 07:23, Michael Ellerman a écrit :
> Christophe Leroy <christophe.leroy@....fr> writes:
>> On 03/20/2020 02:12 AM, Michael Ellerman wrote:
>>> Christophe Leroy <christophe.leroy@....fr> writes:
>>>> Move ADV_DEBUG_REGS functions out of ptrace.c, into
>>>> ptrace-adv.c and ptrace-noadv.c
>>>>
>>>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>>>> ---
>>>> v4: Leave hw_breakpoint.h for ptrace.c
>>>> ---
>>>>    arch/powerpc/kernel/ptrace/Makefile       |   4 +
>>>>    arch/powerpc/kernel/ptrace/ptrace-adv.c   | 468 ++++++++++++++++
>>>>    arch/powerpc/kernel/ptrace/ptrace-decl.h  |   5 +
>>>>    arch/powerpc/kernel/ptrace/ptrace-noadv.c | 236 ++++++++
>>>>    arch/powerpc/kernel/ptrace/ptrace.c       | 650 ----------------------
>>>>    5 files changed, 713 insertions(+), 650 deletions(-)
>>>>    create mode 100644 arch/powerpc/kernel/ptrace/ptrace-adv.c
>>>>    create mode 100644 arch/powerpc/kernel/ptrace/ptrace-noadv.c
>>>
>>> This is somehow breaking the ptrace-hwbreak selftest on Power8:
>>>
>>>     test: ptrace-hwbreak
>>>     tags: git_version:v5.6-rc6-892-g7a285a6067d6
>>>     PTRACE_SET_DEBUGREG, WO, len: 1: Ok
>>>     PTRACE_SET_DEBUGREG, WO, len: 2: Ok
>>>     PTRACE_SET_DEBUGREG, WO, len: 4: Ok
>>>     PTRACE_SET_DEBUGREG, WO, len: 8: Ok
>>>     PTRACE_SET_DEBUGREG, RO, len: 1: Ok
>>>     PTRACE_SET_DEBUGREG, RO, len: 2: Ok
>>>     PTRACE_SET_DEBUGREG, RO, len: 4: Ok
>>>     PTRACE_SET_DEBUGREG, RO, len: 8: Ok
>>>     PTRACE_SET_DEBUGREG, RW, len: 1: Ok
>>>     PTRACE_SET_DEBUGREG, RW, len: 2: Ok
>>>     PTRACE_SET_DEBUGREG, RW, len: 4: Ok
>>>     PTRACE_SET_DEBUGREG, RW, len: 8: Ok
>>>     PPC_PTRACE_SETHWDEBUG, MODE_EXACT, WO, len: 1: Ok
>>>     PPC_PTRACE_SETHWDEBUG, MODE_EXACT, RO, len: 1: Ok
>>>     PPC_PTRACE_SETHWDEBUG, MODE_EXACT, RW, len: 1: Ok
>>>     PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, WO, len: 6: Ok
>>>     PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, RO, len: 6: Ok
>>>     PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, RW, len: 6: Ok
>>>     PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, WO, len: 6: Ok
>>>     PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, RO, len: 6: Fail
>>>     failure: ptrace-hwbreak
>>>
>>> I haven't had time to work out why yet.
>>>
>>
>> A (big) part of commit c3f68b0478e7 ("powerpc/watchpoint: Fix ptrace
>> code that muck around with address/len") was lost during rebase.
>>
>> I'll send a fix, up to you to squash it in or commit it as is.
> 
> Thanks.
> 

One person asked me if I sent the fix already. So yes, it is there:

https://patchwork.ozlabs.org/patch/1259348/

Christophe