linux-kernel - [PATCH v3 3/7] sparc: support static_key usage in non-module _

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Message-Id: <d822da427ab07a02a394602eca687104ff682f83.1467837322.git.jbaron@akamai.com>
Date:	Wed,  6 Jul 2016 17:42:32 -0400
From:	Jason Baron <jbaron@...mai.com>
To:	akpm@...ux-foundation.org
Cc:	joe@...ches.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Subject: [PATCH v3 3/7] sparc: support static_key usage in non-module __exit sections

The jump table can reference text found in an __exit section. Thus,
instead of discarding it at build/link time, include EXIT_TEXT as part
of __init and release it at system boot time.

Without this patch the link fails with:

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

Cc: "David S. Miller" <davem@...emloft.net>
Cc: sparclinux@...r.kernel.org
Signed-off-by: Jason Baron <jbaron@...mai.com>
---
 arch/sparc/kernel/vmlinux.lds.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/sparc/kernel/vmlinux.lds.S b/arch/sparc/kernel/vmlinux.lds.S
index 7d02b1fef025..d79b3b734245 100644
--- a/arch/sparc/kernel/vmlinux.lds.S
+++ b/arch/sparc/kernel/vmlinux.lds.S
@@ -150,6 +150,13 @@ SECTIONS
 	}
 	PERCPU_SECTION(SMP_CACHE_BYTES)
 
+#ifdef CONFIG_JUMP_LABEL
+	. = ALIGN(PAGE_SIZE);
+	.exit.text : {
+		EXIT_TEXT
+	}
+#endif
+
 	. = ALIGN(PAGE_SIZE);
 	__init_end = .;
 	BSS_SECTION(0, 0, 0)
-- 
2.6.1