[PATCH 1/3] efi: Introduce *_continue efi_memory_desc iterators

[mark.rutland@arm.com (Mark Rutland)]

Hi Catalin,

On Tue, May 31, 2016 at 04:14:30PM +0100, Catalin Marinas wrote:
> The for_each_efi_memory_desc_continue() macro and corresponding
> "_in_map" allow iterating over an efi_memory_map from a given position.
> For code reuse between the existing iterator and the _continue variant,
> this patch also introduces efi_memory_desc_next_entry_map().
> 
> Cc: Matt Fleming <matt@codeblueprint.co.uk>
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> ---
>  include/linux/efi.h | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index c2db3ca22217..4b0d880f1cd7 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -1002,11 +1002,16 @@ extern int efi_memattr_init(void);
>  extern int efi_memattr_apply_permissions(struct mm_struct *mm,
>  					 efi_memattr_perm_setter fn);
>  
> +/* Find next entry in an efi_memory_map or NULL if md is last */
> +#define efi_memory_desc_next_entry_map(m, md)				   \
> +	((md) == (efi_memory_desc_t *)((m)->map_end - (m)->desc_size)	   \
> +	 ? NULL : (void *)(md) + (m)->desc_size)
> +
>  /* Iterate through an efi_memory_map */
>  #define for_each_efi_memory_desc_in_map(m, md)				   \
>  	for ((md) = (m)->map;						   \
> -	     (md) <= (efi_memory_desc_t *)((m)->map_end - (m)->desc_size); \
> -	     (md) = (void *)(md) + (m)->desc_size)
> +	     (md);							   \
> +	     (md) = efi_memory_desc_next_entry_map(m, md))

As a heads-up, this will conflict with the efi/urgent branch [1], due to
commit ee92562e33c516dd ("efi: Fix for_each_efi_memory_desc_in_map() for
empty memmaps"). A pull went out for that yesterday [2].

Thanks,
Mark.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git urgent
[2] http://lkml.kernel.org/r/1464690224-4503-1-git-send-email-matt at codeblueprint.co.uk