From 0e0d314e6a01bb14d303e35e6f7ba24b17020044 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Thu, 17 May 2007 20:14:48 +0200 Subject: kbuild: introduce __init_refok/__initdata_refok to supress section mismatch warnings Throughout the kernel there are a few legitimite references to init or exit sections. Most of these are covered by the patterns included in modpost but a few nees special attention. To avoid hardcoding a lot of function names in modpost introduce a marker so relevant function/data can be marked. When modpost see a reference to a init/exit function from a function/data marked no warning will be issued. Idea from: Andrew Morton Signed-off-by: Sam Ravnborg Cc: Andrew Morton --- include/linux/init.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'include/linux/init.h') diff --git a/include/linux/init.h b/include/linux/init.h index e007ae4dc41..56ec4c62eee 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -45,6 +45,19 @@ #define __exitdata __attribute__ ((__section__(".exit.data"))) #define __exit_call __attribute_used__ __attribute__ ((__section__ (".exitcall.exit"))) +/* modpost check for section mismatches during the kernel build. + * A section mismatch happens when there are references from a + * code or data section to an init section (both code or data). + * The init sections are (for most archs) discarded by the kernel + * when early init has completed so all such references are potential bugs. + * For exit sections the same issue exists. + * The following markers are used for the cases where the reference to + * the init/exit section (code or data) is valid and will teach modpost + * not to issue a warning. + * The markers follow same syntax rules as __init / __initdata. */ +#define __init_refok noinline __attribute__ ((__section__ (".text.init.refok"))) +#define __initdata_refok __attribute__ ((__section__ (".data.init.refok"))) + #ifdef MODULE #define __exit __attribute__ ((__section__(".exit.text"))) #else -- cgit v1.2.3