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Subject[PATCH v3 4/7] tile: support static_key usage in non-module __exit sections
Date
From: Chris Metcalf <cmetcalf@mellanox.com>

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.

Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
Signed-off-by: Jason Baron <jbaron@akamai.com>
---
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
--
2.6.1
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