module: set __jump_table alignment to 8
authorDavid Daney <david.daney@cavium.com>
Wed, 1 Mar 2017 22:04:53 +0000 (14:04 -0800)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Fri, 3 Mar 2017 14:44:59 +0000 (09:44 -0500)
commitab42632156becd35d3884ee5c14da2bedbf3149a
tree040061e56705658d626a481c97cf0328bb019ba3
parent92ad18ec26611e8a47639e600bd9dc42fbe2edcf
module: set __jump_table alignment to 8

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>
scripts/module-common.lds