efi: create memory map iteration helper

There are a lot of places in the kernel which iterate through an
EFI memory map. Most of these places use essentially the same
for-loop code. This patch adds a for_each_efi_memory_desc()
helper to clean up all of the existing duplicate code and avoid
more in the future.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
(cherry picked from commit e885cd805fc6e65ef5150a211c7bac02f925af04)
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/include/linux/efi.h b/include/linux/efi.h
index b7e1ed801a7f79c67badc648bf578dbde66ff348..605bb423b9c1354d89f0c3db262a24fde9d26514 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -619,6 +619,12 @@ extern void efi_reserve_boot_services(void);
 extern int efi_get_fdt_params(struct efi_fdt_params *params, int verbose);
 extern struct efi_memory_map memmap;
 
+/* Iterate through an efi_memory_map */
+#define for_each_efi_memory_desc(m, md)                                           \
+       for ((md) = (m)->map;                                              \
+            (md) <= (efi_memory_desc_t *)((m)->map_end - (m)->desc_size); \
+            (md) = (void *)(md) + (m)->desc_size)
+
 /**
  * efi_range_is_wc - check the WC bit on an address range
  * @start: starting kvirt address