In some cases structures are placed into dedicated sections by means of the "section" compiler attribute and then accessed as elements of an array (e.g when the __clk_of_table is set up which contains all potential clock providers - see CLK_OF_DECLARE). But even if the size of such a structure is a multiple of the processors word size, the linker may decide to use an even greater alignment and thus use padding in between the structures. In this case accessing a structure as an array element is not possible. To avoid such padding and thus allow to access such a structure as an array element enforce an alignment of processor word size by means of the "aligned" attribute.
Signed-off-by: Lino Sanfilippo <[email protected]> --- include/linux/compiler.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 33063f8..6f32128 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -371,7 +371,8 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s /* Simple shorthand for a section definition */ #ifndef __section -# define __section(S) __attribute__ ((__section__(#S))) +# define __section(S) __attribute__ ((__section__(#S))) \ + __aligned(sizeof(void *)) #endif #ifndef __visible -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
