linux-kernel - [PATCH] livepatch: Make livepatch dependent on !TRIM_UNUSED

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Date:   Fri, 26 May 2017 14:45:21 +0200
From:   Miroslav Benes <mbenes@...e.cz>
To:     jpoimboe@...hat.com, jeyu@...hat.com, jikos@...nel.org
Cc:     mmarek@...e.com, pmladek@...e.com, jmoreira@...e.de,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Miroslav Benes <mbenes@...e.cz>
Subject: [PATCH] livepatch: Make livepatch dependent on !TRIM_UNUSED_KSYMS

If TRIM_UNUSED_KSYMS is enabled, all unneeded exported symbols are made
unexported. Two-pass build of the kernel is done to find out which
symbols are needed based on a configuration. This effectively
complicates things for out-of-tree modules.

Livepatch exports functions to (un)register and enable/disable a live
patch. The only in-tree module which uses these functions is a sample in
samples/livepatch/. If the sample is disabled, the functions are
trimmed and out-of-tree live patches cannot be built.

Note that live patches are intended to be built out-of-tree.

Suggested-by: Michal Marek <mmarek@...e.com>
Signed-off-by: Miroslav Benes <mbenes@...e.cz>
---
 kernel/livepatch/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/livepatch/Kconfig b/kernel/livepatch/Kconfig
index 045022557936..ec4565122e65 100644
--- a/kernel/livepatch/Kconfig
+++ b/kernel/livepatch/Kconfig
@@ -10,6 +10,7 @@ config LIVEPATCH
 	depends on SYSFS
 	depends on KALLSYMS_ALL
 	depends on HAVE_LIVEPATCH
+	depends on !TRIM_UNUSED_KSYMS
 	help
 	  Say Y here if you want to support kernel live patching.
 	  This option has no runtime impact until a kernel "patch"
-- 
2.12.2