linux-kernel - Re: [PATCH 06/27] Documentation: x86: convert entry

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Date:   Sat, 27 Apr 2019 11:52:27 -0300
From:   Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Jonathan Corbet <corbet@....net>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/27] Documentation: x86: convert entry_64.txt to reST

Em Fri, 26 Apr 2019 23:31:29 +0800
Changbin Du <changbin.du@...il.com> escreveu:

> This converts the plain text documentation to reStructuredText format and
> add it to Sphinx TOC tree. No essential content change.
> 
> Signed-off-by: Changbin Du <changbin.du@...il.com>

Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>

> ---
>  Documentation/x86/{entry_64.txt => entry_64.rst} | 12 +++++++++---
>  Documentation/x86/index.rst                      |  1 +
>  2 files changed, 10 insertions(+), 3 deletions(-)
>  rename Documentation/x86/{entry_64.txt => entry_64.rst} (95%)
> 
> diff --git a/Documentation/x86/entry_64.txt b/Documentation/x86/entry_64.rst
> similarity index 95%
> rename from Documentation/x86/entry_64.txt
> rename to Documentation/x86/entry_64.rst
> index c1df8eba9dfd..a48b3f6ebbe8 100644
> --- a/Documentation/x86/entry_64.txt
> +++ b/Documentation/x86/entry_64.rst
> @@ -1,3 +1,9 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +==============
> +Kernel Entries
> +==============
> +
>  This file documents some of the kernel entries in
>  arch/x86/entry/entry_64.S.  A lot of this explanation is adapted from
>  an email from Ingo Molnar:
> @@ -59,7 +65,7 @@ Now, there's a secondary complication: there's a cheap way to test
>  which mode the CPU is in and an expensive way.
>  
>  The cheap way is to pick this info off the entry frame on the kernel
> -stack, from the CS of the ptregs area of the kernel stack:
> +stack, from the CS of the ptregs area of the kernel stack::
>  
>  	xorl %ebx,%ebx
>  	testl $3,CS+8(%rsp)
> @@ -67,7 +73,7 @@ stack, from the CS of the ptregs area of the kernel stack:
>  	SWAPGS
>  
>  The expensive (paranoid) way is to read back the MSR_GS_BASE value
> -(which is what SWAPGS modifies):
> +(which is what SWAPGS modifies)::
>  
>  	movl $1,%ebx
>  	movl $MSR_GS_BASE,%ecx
> @@ -76,7 +82,7 @@ The expensive (paranoid) way is to read back the MSR_GS_BASE value
>  	js 1f   /* negative -> in kernel */
>  	SWAPGS
>  	xorl %ebx,%ebx
> -1:	ret
> +  1:	ret
>  
>  If we are at an interrupt or user-trap/gate-alike boundary then we can
>  use the faster check: the stack will be a reliable indicator of
> diff --git a/Documentation/x86/index.rst b/Documentation/x86/index.rst
> index 489f4f4179c4..8a666c5abc85 100644
> --- a/Documentation/x86/index.rst
> +++ b/Documentation/x86/index.rst
> @@ -12,3 +12,4 @@ Linux x86 Support
>     topology
>     exception-tables
>     kernel-stacks
> +   entry_64


Thanks,
Mauro