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tile: support static_key usage in non-module __exit sections

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Previously, all the __exit sections were just dropped by the link phase.
However, if there are static_key (jump label) constructs in __exit
sections that are not modules, the link fails with the message:

   `.exit.text' referenced in section `__jump_table' of xxx.o:
   defined in discarded section `.exit.text' of xxx.o

Support this usage by keeping the .exit.text sections in the final image
if JUMP_LABEL is defined, then discarding them once initialization is
complete.

Link: http://lkml.kernel.org/r/bfd7c107c610c30e992868ebfe2a5d796a097464.1467837322.git.jbaron@akamai.com
Signed-off-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Joe Perches <joe@perches.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chris Metcalf 2016-08-03 13:46:30 -07:00 committed by Linus Torvalds
parent 10d7227bb9
commit c14b4bcfd9
1 changed files with 12 additions and 0 deletions
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12
arch/tile/kernel/vmlinux.lds.S
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@ -60,6 +60,18 @@ SECTIONS
/* "Init" is divided into two areas with very different virtual addresses. */
INIT_TEXT_SECTION(PAGE_SIZE)
/*
* Some things, like the __jump_table, may contain symbol references
* to __exit text, so include such text in the final image if so.
* In that case we also override the _einittext from INIT_TEXT_SECTION.
*/
#ifdef CONFIG_JUMP_LABEL
.exit.text : {
EXIT_TEXT
_einittext = .;
}
#endif
/* Now we skip back to PAGE_OFFSET for the data. */
. = (. - TEXT_OFFSET + PAGE_OFFSET);
#undef LOAD_OFFSET