linux-kernel - Re: [PATCH v4] livepatch: Cleanup module page permission changes

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Message-ID: <alpine.LNX.2.00.1512042254100.9922@cbobk.fhfr.pm>
Date:	Fri, 4 Dec 2015 22:54:43 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
cc:	Seth Jennings <sjenning@...hat.com>,
	Vojtech Pavlik <vojtech@...e.com>,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Miroslav Benes <mbenes@...e.cz>
Subject: Re: [PATCH v4] livepatch: Cleanup module page permission changes

On Thu, 3 Dec 2015, Josh Poimboeuf wrote:

> Calling set_memory_rw() and set_memory_ro() for every iteration of the
> loop in klp_write_object_relocations() is messy, inefficient, and
> error-prone.
> 
> Change all the read-only pages to read-write before the loop and convert
> them back to read-only again afterwards.
> 
> Suggested-by: Miroslav Benes <mbenes@...e.cz>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
> Based on the following branches:
> - git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching.git for-4.5/core
> - git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux.git modules-next
> 
> - v4: rebase onto Chris's sympos changes
> - v3: use new module_{disable,enable}_ro() functions (in linux-next)

Merged together with patches from Rusty's modules-next and applied to 
for-4.5/core. Thanks,

-- 
Jiri Kosina
SUSE Labs

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