From: Chris Metcalf <cmetcalf@xxxxxxxxxxxx> Subject: 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@xxxxxxxxxx Signed-off-by: Jason Baron <jbaron@xxxxxxxxxx> Signed-off-by: Chris Metcalf <cmetcalf@xxxxxxxxxxxx> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Cc: Joe Perches <joe@xxxxxxxxxxx> Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/tile/kernel/vmlinux.lds.S | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff -puN arch/tile/kernel/vmlinux.lds.S~tile-support-static_key-usage-in-non-module-__exit-sections arch/tile/kernel/vmlinux.lds.S --- a/arch/tile/kernel/vmlinux.lds.S~tile-support-static_key-usage-in-non-module-__exit-sections +++ a/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 _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
