Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call

[PATCH v2] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Elvira Khabirova <hidden> · 2018-11-16
Re: [PATCH v2] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Michael Ellerman <mpe@ellerman.id.au> · 2018-11-16
[PATCH v3] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Dmitry V. Levin <hidden> · 2018-11-19
Re: [PATCH v3] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Michael Ellerman <mpe@ellerman.id.au> · 2018-11-21
[PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Dmitry V. Levin <hidden> · 2018-12-03
Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Dmitry V. Levin <hidden> · 2018-12-07
Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Michael Ellerman <mpe@ellerman.id.au> · 2018-12-07
Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Dmitry V. Levin <hidden> · 2018-12-07
[PATCH v5] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Dmitry V. Levin <hidden> · 2018-12-07
[PATCH v6] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Dmitry V. Levin <hidden> · 2018-12-07
Re: [PATCH v6] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Oleg Nesterov <oleg@redhat.com> · 2018-12-10
Re: [PATCH v6] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Dmitry V. Levin <hidden> · 2018-12-10
[PATCH] powerpc/ptrace: cleanup do_syscall_trace_enter · Dmitry V. Levin <hidden> · 2018-12-16
Re: [PATCH] powerpc/ptrace: cleanup do_syscall_trace_enter · Michael Ellerman <mpe@ellerman.id.au> · 2018-12-17
Re: [PATCH] powerpc/ptrace: cleanup do_syscall_trace_enter · Dmitry V. Levin <hidden> · 2018-12-17
Re: [PATCH] powerpc/ptrace: cleanup do_syscall_trace_enter · Oleg Nesterov <oleg@redhat.com> · 2018-12-17
Re: powerpc/ptrace: cleanup do_syscall_trace_enter · Michael Ellerman <hidden> · 2018-12-22
Re: [v5] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Michael Ellerman <hidden> · 2018-12-11
Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Oleg Nesterov <oleg@redhat.com> · 2018-12-07
Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call · Dmitry V. Levin <hidden> · 2018-12-07

From: Oleg Nesterov <oleg@redhat.com>
Date: 2018-12-07 16:34:18
Also in: lkml

On 12/07, Dmitry V. Levin wrote:

On Fri, Dec 07, 2018 at 10:12:49PM +1100, Michael Ellerman wrote:

quoted

Sorry, this patch does not work, please ignore it.

Hmm OK. Why exactly?

Unfortunately, I have no idea why it doesn't work.
All I can say is it breaks strace because the kernel no longer sends
syscall entry stops.

May be because TIF_SYSCALL_EMU/etc is a bit number, not a mask? IOW, rather
than

	whatever & TIF_XXX

you should do

	whatever & _TIF_XXX

intstead?

Oleg.

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