This is a note to let you know that I've just added the patch titled
module: set __jump_table alignment to 8
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
module-set-__jump_table-alignment-to-8.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Dec 12 13:26:17 CET 2017
From: David Daney <david.daney@xxxxxxxxxx>
Date: Wed, 1 Mar 2017 14:04:53 -0800
Subject: module: set __jump_table alignment to 8
From: David Daney <david.daney@xxxxxxxxxx>
[ Upstream commit ab42632156becd35d3884ee5c14da2bedbf3149a ]
For powerpc the __jump_table section in modules is not aligned, this
causes a WARN_ON() splat when loading a module containing a __jump_table.
Strict alignment became necessary with commit 3821fd35b58d
("jump_label: Reduce the size of struct static_key"), currently in
linux-next, which uses the two least significant bits of pointers to
__jump_table elements.
Fix by forcing __jump_table to 8, which is the same alignment used for
this section in the kernel proper.
Link: http://lkml.kernel.org/r/20170301220453.4756-1-david.daney@xxxxxxxxxx
Reviewed-by: Jason Baron <jbaron@xxxxxxxxxx>
Acked-by: Jessica Yu <jeyu@xxxxxxxxxx>
Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> (powerpc)
Tested-by: Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
scripts/module-common.lds | 2 ++
1 file changed, 2 insertions(+)
--- a/scripts/module-common.lds
+++ b/scripts/module-common.lds
@@ -19,4 +19,6 @@ SECTIONS {
. = ALIGN(8);
.init_array 0 : { *(SORT(.init_array.*)) *(.init_array) }
+
+ __jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) }
}
Patches currently in stable-queue which might be from david.daney@xxxxxxxxxx are
queue-4.9/module-set-__jump_table-alignment-to-8.patch