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| author | Chris Metcalf <cmetcalf@mellanox.com> | 2016-08-03 13:46:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-04 08:50:07 -0400 |
| commit | c14b4bcfd92258a65eb82e3920ad970a81084c54 (patch) | |
| tree | ffdcc0096f7cbb99c6343837835320774403d191 /arch/tile | |
| parent | 10d7227bb911e5ee788fb8f82b1005b821bb7847 (diff) | |
| download | lwn-c14b4bcfd92258a65eb82e3920ad970a81084c54.tar.gz lwn-c14b4bcfd92258a65eb82e3920ad970a81084c54.zip | |
tile: support static_key usage in non-module __exit sections
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>
Diffstat (limited to 'arch/tile')
| -rw-r--r-- | arch/tile/kernel/vmlinux.lds.S | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/tile/kernel/vmlinux.lds.S b/arch/tile/kernel/vmlinux.lds.S index 378f5d8d1ec8..9d449caf8910 100644 --- a/arch/tile/kernel/vmlinux.lds.S +++ b/arch/tile/kernel/vmlinux.lds.S @@ -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 |