linux-kernel - Re: [PATCH v14 07/11] livepatch: Add atomic replace

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Message-ID: <20190103124740.s3mpgmjw4no4qr6f@pathway.suse.cz>
Date:   Thu, 3 Jan 2019 13:47:40 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>,
        Jason Baron <jbaron@...mai.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [PATCH v14 07/11] livepatch: Add atomic replace

On Mon 2018-12-17 16:27:41, Petr Mladek wrote:
> On Thu 2018-12-13 16:55:28, Josh Poimboeuf wrote:
> > On Thu, Nov 29, 2018 at 10:44:27AM +0100, Petr Mladek wrote:
> > Side note, it would probably be useful to have a klp_for_each_patch()
> > helper.
> 
> Will do.

Hmm, there are two possibilities:

1) #define klp_for_each_patch(patch)	\
	list_for_each_entry(patch, &klp_patches, list)

2) #define klp_for_each_patch(patches, patch)	\
	list_for_each_entry(patch, &patches, list)

Problems:

1st variant would need to declare klp_patches in
include/linux/livepatch.h. Josh did not like even
kernel/livepatch/core.h.

2nd variant looks ugly to me.

Alternative solution would be to move all klp_for_each*()
definitions from include/linux/livepatch.h to kernel/livepatch/core.h.
But there might be some users. I wonder if we use these
macros when preparing the cumulative patches.

As any solution looks controversial, I would prefer to postpone this change
after this patchset is accepted.

Best Regards,
Petr