On Mon, 1 Feb 2021, Christoph Hellwig wrote:

On Mon, Feb 01, 2021 at 02:37:12PM +0100, Miroslav Benes wrote:

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This change is not needed. (objname == NULL) means that we are
interested only in symbols in "vmlinux".

module_kallsyms_on_each_symbol(klp_find_callback, &args)
will always fail when objname == NULL.

I just tried to keep the old behavior.  I can respin it with your
recommended change noting the change in behavior, though.

Yes, please. It would be cleaner that way.

Let me know if this works for you:

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From 18af41e88d088cfb8680d1669fcae2bc2ede5328 Mon Sep 17 00:00:00 2001

From: Christoph Hellwig <hch@lst.de>
Date: Wed, 20 Jan 2021 16:23:16 +0100
Subject: kallsyms: refactor {,module_}kallsyms_on_each_symbol

Require an explicit call to module_kallsyms_on_each_symbol to look
for symbols in modules instead of the call from kallsyms_on_each_symbol,
and acquire module_mutex inside of module_kallsyms_on_each_symbol instead
of leaving that up to the caller.  Note that this slightly changes the
behavior for the livepatch code in that the symbols from vmlinux are not
iterated anymore if objname is set, but that actually is the desired
behavior in this case.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Acked-by: Miroslav Benes <mbenes@suse.cz>

Thanks Christoph

M