Re: [Xen-devel] [PATCH for-4.13 6/6] xen/arm: traps: Mark check_stack_alignment_constraints as unused

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 2 Oct 2019, Julien Grall wrote:
> Clang will throw an error if a function is unused unless you tell
> to ignore it. This can be done using __maybe_unused.
> 
> While modifying the declaration, update it to match prototype of similar
> functions (see build_assertions). This helps to understand that the sole
> purpose of the function is to hold BUILD_BUG_ON().
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

Same small note about build_assertions becoming __init.

Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
>     Changes in v2:
>         - Update the prototype to match style of other functions holding
>         on build assertions.
> ---
>  xen/arch/arm/traps.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
> index a3b961bd06..a3deb59372 100644
> --- a/xen/arch/arm/traps.c
> +++ b/xen/arch/arm/traps.c
> @@ -54,7 +54,8 @@
>   * that both the kernel half of struct cpu_user_regs (which is pushed in
>   * entry.S) and struct cpu_info (which lives at the bottom of a Xen
>   * stack) must be doubleword-aligned in size.  */
> -static inline void check_stack_alignment_constraints(void) {
> +static void __init __maybe_unused build_assertions(void)
> +{
>  #ifdef CONFIG_ARM_64
>      BUILD_BUG_ON((sizeof (struct cpu_user_regs)) & 0xf);
>      BUILD_BUG_ON((offsetof(struct cpu_user_regs, spsr_el1)) & 0xf);
> -- 
> 2.11.0
> 

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