[lkml]   [2012]   [Feb]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] kernel.h: Include <linux/bug.h> to avoid build breakage with ARRAY_SIZE()
On Tue, Feb 28, 2012 at 10:41:39AM -0300, Fabio Estevam wrote:
> Building imx_v6_v7_defconfig generated the following build error:
> arch/arm/mach-imx/cpu_op-mx51.c: In function 'mx51_get_cpu_op':
> arch/arm/mach-imx/cpu_op-mx51.c:27: error: implicit declaration of function 'BUILD_BUG_ON_ZERO'
> commit 6f863554 (kernel.h: doesn't explicitly use bug.h, so don't include it.)
> has removed asm/debug.h from linux/kernel.h.
> Quoting Russell King (
> "linux/kernel.h _does_ use bug stuff - in ARRAY_SIZE().
> ARRAY_SIZE() uses __must_be_array(), which is defined in linux/compiler-gcc.h,
> which is obtained via linux/compiler.h and linux/linkage.h.
> linux/compiler-gcc.h defines __must_be_array() to be:
> #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))

In which case linux/compiler-gcc.h uses bug.h - so this is where you
should add the include.
Not in kernel.h that just happens to use __must_be_array()
We do not want to add "#include bug.h" to all header files
that happens to use __must_be_array.


 \ /
  Last update: 2012-02-28 16:53    [W:0.098 / U:0.596 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site