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x86, boot: Use __attribute__((used)) to ensure videocard structs are emitted 

It looks like GCC will always emit an object that is marked with an
explicit section, although the documentation doesn't say that and we
possibly shouldn't be relying on it.

Clang does *not* do so, so add __attribute__((used)) to make sure.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Link: http://lkml.kernel.org/r/1389180083-23249-2-git-send-email-David.Woodhouse@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
David Woodhouse 2014-01-08 11:21:21 +00:00 committed by H. Peter Anvin
parent 1c678da3bd
commit 9b3965f740
1 changed files with 1 additions and 1 deletions
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arch/x86/boot/video.h
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@ -80,7 +80,7 @@ struct card_info {
u16 xmode_n; /* Size of unprobed mode range */
};
#define __videocard struct card_info __attribute__((section(".videocards")))
#define __videocard struct card_info __attribute__((used,section(".videocards")))
extern struct card_info video_cards[], video_cards_end[];
int mode_defined(u16 mode); /* video.c */