From patchwork series 427067

https://patchwork.ozlabs.org//project/linuxppc-dev/list/?series=427067

Author: Fox Snowpatch

arch/powerpc/kernel/fadump.c

@@ -512,6 +512,10 @@ static u64 __init fadump_locate_reserve_mem(u64 base, u64 size)
 	phys_addr_t mstart, mend;
 	int idx = 0;
 	u64 i, ret = 0;
+	unsigned long align = PAGE_SIZE;
+
+	if (IS_ENABLED(CONFIG_CMA) && !fw_dump.nocma)
+		align = CMA_MIN_ALIGNMENT_BYTES;
 
 	mrngs = reserved_mrange_info.mem_ranges;
 	for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
@@ -520,7 +524,7 @@ static u64 __init fadump_locate_reserve_mem(u64 base, u64 size)
 			 i, mstart, mend, base);
 
 		if (mstart > base)
-			base = PAGE_ALIGN(mstart);
+			base = ALIGN(mstart, align);
 
 		while ((mend > base) && ((mend - base) >= size)) {
 			if (!overlaps_reserved_ranges(base, base+size, &idx)) {
@@ -529,7 +533,7 @@ static u64 __init fadump_locate_reserve_mem(u64 base, u64 size)
 			}
 
 			base = mrngs[idx].base + mrngs[idx].size;
-			base = PAGE_ALIGN(base);
+			base = ALIGN(base, align);
 		}
 	}
 

include/linux/cma.h

@@ -5,6 +5,7 @@
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/numa.h>
+#include <linux/minmax.h>
 
 #ifdef CONFIG_CMA_AREAS
 #define MAX_CMA_AREAS	CONFIG_CMA_AREAS
@@ -17,7 +18,8 @@
  * -- can deal with only some pageblocks of a higher-order page being
  *  MIGRATE_CMA, we can use pageblock_nr_pages.
  */
-#define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages
+#define CMA_MIN_ALIGNMENT_PAGES \
+	(1ULL << min_not_zero(MAX_PAGE_ORDER, pageblock_order))
 #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
 
 struct cma;