linux-kernel - Re: (mostly) Arch-independent livepatch

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Date:	Wed, 30 Mar 2016 09:10:09 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	Jessica Yu <jeyu@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Petr Mladek <pmladek@...e.com>,
	Jonathan Corbet <corbet@....net>,
	Miroslav Benes <mbenes@...e.cz>, linux-api@...r.kernel.org,
	live-patching@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: (mostly) Arch-independent livepatch

On Wed, Mar 30, 2016 at 01:24:08AM +0200, Jiri Kosina wrote:
> On Tue, 29 Mar 2016, Jessica Yu wrote:
> 
> > > v6:
> > > - Since we hard-code the field widths for the objname and symbol name
> > >   for the sscanf() calls, which are supposed to correspond to the values
> > >   of MODULE_NAME_LEN and KSYM_NAME_LEN, use BUILD_BUG_ON() to detect when
> > >   the values of these constants deviate from the expected values.
> > > - Squash the sample livepatch module patch into patch 4
> > >   ("livepatch: reuse module loader code to write relocations") so
> > >   git bisects don't break
> > > - Don't need the klp_buf struct, just use plain char arrays to hold the
> > >   output of sscanf(). Also, no need to clear the bufs after every
> > >   invocation, as sscanf() takes care to put a null byte at the end of
> > >   the bufs.
> > > - Fix compiler kbuild errors for the !CONFIG_LIVEPATCH case
> > > - Fixed some small module.c nits
> > > 
> > 
> > Pinging Rusty, just in case this thread got buried :-)
> > How do the module.c changes look?
> 
> Plus there are (admittedly indeed rather small and trivial) changes to 
> s390 module loader, so I'd prefer to have Heiko's / Martin's Ack before 
> merging this.
> 
> Hence, let me piggy back on this ping to Rusty, and let me ping Heiko and 
> Martin as well (adding to CC explicitly to make sure this doesn't get lost 
> in general noise).

For the s390 changes:
Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>

Jessica, thanks for also writing the documentation!