arm: set alignment properly for asm funcs

ARM requires a 4-byte alignment on all ARM code (though this
requirement is relaxed to 2-byte for some THUMB code) and we
should be explicit about that here.

GAS has its own fix for this[1] that forces proper alignment
on any section containing assembled instructions, but this is
not universal: Clang's and other gaslike assemblers lack this
implicit alignment. Whether or not this is considered a bug in
those assemblers, it is better to ask directly for what we want.

[1]: https://sourceware.org/bugzilla/show_bug.cgi?id=12931

Signed-off-by: Sam Edwards <CFSworks@gmail.com>

diff --git a/arch/arm/include/asm/linkage.h b/arch/arm/include/asm/linkage.h
index dbe4b4e..73bf25b 100644 (file)
--- a/arch/arm/include/asm/linkage.h
+++ b/arch/arm/include/asm/linkage.h
@@ -1,7 +1,7 @@
 #ifndef __ASM_LINKAGE_H
 #define __ASM_LINKAGE_H
 
-#define __ALIGN .align 0
-#define __ALIGN_STR ".align 0"
+#define __ALIGN .p2align 2
+#define __ALIGN_STR ".p2align 2"
 
 #endif