From c14b4bcfd92258a65eb82e3920ad970a81084c54 Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Wed, 3 Aug 2016 13:46:30 -0700 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@akamai.com Signed-off-by: Jason Baron Signed-off-by: Chris Metcalf Cc: "David S. Miller" Cc: Arnd Bergmann Cc: Benjamin Herrenschmidt Cc: Heiko Carstens Cc: Joe Perches Cc: Martin Schwidefsky Cc: Michael Ellerman Cc: Paul Mackerras Cc: Peter Zijlstra Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/tile/kernel/vmlinux.lds.S | 12 ++++++++++++ 1 file changed, 12 insertions(+) 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 -- cgit v1.2.3