linux-kernel - Re: [PATCH 9/9] x86/asm/entry/64: Remove GET_THREAD_INFO in ret_from

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Message-ID: <CALCETrXq0agXan_LVUEjoBJHiSgWaUEyd-aEHoy_d1E5JJJooQ@mail.gmail.com>
Date:	Thu, 2 Apr 2015 12:02:16 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 9/9] x86/asm/entry/64: Remove GET_THREAD_INFO in ret_from_fork

On Thu, Apr 2, 2015 at 7:36 AM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
> It used to be used to check for _TIF_IA32, but the check has been removed.
>
> Remove GET_THREAD_INFO too.
>
> Run-tested.

Acked-by: Andy Lutomirski <luto@...nel.org>

Anyone know what the eflags reset code just above it is for?  Is it
because we used to allow NT in kernel eflags?

--Andy

>
> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> CC: Linus Torvalds <torvalds@...ux-foundation.org>
> CC: Steven Rostedt <rostedt@...dmis.org>
> CC: Ingo Molnar <mingo@...nel.org>
> CC: Borislav Petkov <bp@...en8.de>
> CC: "H. Peter Anvin" <hpa@...or.com>
> CC: Andy Lutomirski <luto@...capital.net>
> CC: Oleg Nesterov <oleg@...hat.com>
> CC: Frederic Weisbecker <fweisbec@...il.com>
> CC: Alexei Starovoitov <ast@...mgrid.com>
> CC: Will Drewry <wad@...omium.org>
> CC: Kees Cook <keescook@...omium.org>
> CC: x86@...nel.org
> CC: linux-kernel@...r.kernel.org
> ---
>  arch/x86/kernel/entry_64.S | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
> index 0124f6f..7bc097a 100644
> --- a/arch/x86/kernel/entry_64.S
> +++ b/arch/x86/kernel/entry_64.S
> @@ -507,8 +507,6 @@ ENTRY(ret_from_fork)
>
>         call schedule_tail                      # rdi: 'prev' task parameter
>
> -       GET_THREAD_INFO(%rcx)
> -
>         RESTORE_EXTRA_REGS
>
>         testl $3,CS(%rsp)                       # from kernel_thread?
> --
> 1.8.1.4
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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