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%3Ba=su...
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@vger.kernel.org know about it.
From foo@baz Tue Dec 12 13:26:17 CET 2017
From: David Daney david.daney@cavium.com Date: Wed, 1 Mar 2017 14:04:53 -0800 Subject: module: set __jump_table alignment to 8
From: David Daney david.daney@cavium.com
[ 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@cavium.com
Reviewed-by: Jason Baron jbaron@akamai.com Acked-by: Jessica Yu jeyu@redhat.com Acked-by: Michael Ellerman mpe@ellerman.id.au (powerpc) Tested-by: Sachin Sant sachinp@linux.vnet.ibm.com Signed-off-by: David Daney david.daney@cavium.com Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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@cavium.com are
queue-4.9/module-set-__jump_table-alignment-to-8.patch