linux-kernel - [PATCH v2 4/4] kernel: add support for init

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Date:	Wed,  4 Sep 2013 16:42:56 +0200
From:	Frantisek Hrbata <fhrbata@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	jstancek@...hat.com, keescook@...omium.org,
	peter.oberparleiter@...ibm.com, rusty@...tcorp.com.au,
	linux-arch@...r.kernel.org, arnd@...db.de, mgahagan@...hat.com,
	agospoda@...hat.com, akpm@...ux-foundation.org
Subject: [PATCH v2 4/4] kernel: add support for init_array constructors

This adds the .init_array section as yet another section with constructors. This
is needed because gcc could add __gcov_init calls to .init_array or .ctors
section, depending on gcc version.

v2: - reuse mod->ctors for .init_array section for modules, because gcc uses
      .ctors or .init_array, but not both at the same time

Signed-off-by: Frantisek Hrbata <fhrbata@...hat.com>
---
 include/asm-generic/vmlinux.lds.h | 1 +
 kernel/module.c                   | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 69732d2..c55d8d9 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -468,6 +468,7 @@
 #define KERNEL_CTORS()	. = ALIGN(8);			   \
 			VMLINUX_SYMBOL(__ctors_start) = .; \
 			*(.ctors)			   \
+			*(.init_array)			   \
 			VMLINUX_SYMBOL(__ctors_end) = .;
 #else
 #define KERNEL_CTORS()
diff --git a/kernel/module.c b/kernel/module.c
index 2069158..bbbd953 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2760,6 +2760,9 @@ static void find_module_sections(struct module *mod, struct load_info *info)
 #ifdef CONFIG_CONSTRUCTORS
 	mod->ctors = section_objs(info, ".ctors",
 				  sizeof(*mod->ctors), &mod->num_ctors);
+	if (!mod->ctors)
+		mod->ctors = section_objs(info, ".init_array",
+				sizeof(*mod->ctors), &mod->num_ctors);
 #endif
 
 #ifdef CONFIG_TRACEPOINTS
-- 
1.8.3.1

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