linux-kernel - Re: [PATCH v2] Documentation: x86: exception-tables: document CONFIG_BUILDTIME_TABLE

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Message-ID: <20200327105242.20a6d20e@lwn.net>
Date:   Fri, 27 Mar 2020 10:52:42 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v2] Documentation: x86: exception-tables: document
 CONFIG_BUILDTIME_TABLE_SORT

On Thu, 26 Mar 2020 17:09:51 -0700
Nick Desaulniers <ndesaulniers@...gle.com> wrote:

> Provide more information about __ex_table sorting post link.
> 
> The exception tables and fixup tables use a commonly recurring pattern
> in the kernel of storing the address of labels as date in custom ELF
> sections, then finding these sections, iterating elements within them,
> and possibly revisiting them or modifying the data at these addresses.
> 
> Sorting readonly arrays to minimize runtime penalties is quite clever.
> 
> Suggested-by: H. Peter Anvin <hpa@...or.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

I've applied this, thanks.

jon