[PATCH 3/5] sparc32: populate memblock from the PROM memory map

[Magnus Lindholm]

Add each available PROM memory range to memblock as it is discovered.
Keep populating sp_banks temporarily so the remaining users continue to
work while they are converted in the following patches.

Since the complete PROM map is now present before bootmem_init(), enforce
the mem= limit after the legacy bank processing. Adding a smaller
overlapping range would otherwise leave memory beyond the requested limit
in memblock during this intermediate commit.

Suggested-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Magnus Lindholm <linmag7@xxxxxxxxx>
---
 arch/sparc/mm/init_32.c  | 3 +++
 arch/sparc/prom/memory.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
index e0e66f91ceeb..75050dfbc2ea 100644
--- a/arch/sparc/mm/init_32.c
+++ b/arch/sparc/mm/init_32.c
@@ -165,6 +165,9 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
 		memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes);
 	}
 
+	if (cmdline_memory_size)
+		memblock_enforce_memory_limit(cmdline_memory_size);
+
 	/* Start with page aligned address of last symbol in kernel
 	 * image.
 	 */
diff --git a/arch/sparc/prom/memory.c b/arch/sparc/prom/memory.c
index 269d6ab5ef5e..59962bc0bc82 100644
--- a/arch/sparc/prom/memory.c
+++ b/arch/sparc/prom/memory.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/memblock.h>
 #include <linux/sort.h>
 #include <linux/init.h>
 
@@ -23,6 +24,7 @@ static int __init prom_meminit_v0(void)
 	for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
 		sp_banks[index].base_addr = (unsigned long) p->start_adr;
 		sp_banks[index].num_bytes = p->num_bytes;
+		memblock_add(p->start_adr, p->num_bytes & PAGE_MASK);
 		index++;
 	}
 
@@ -42,6 +44,7 @@ static int __init prom_meminit_v2(void)
 	for (i = 0; i < num_ents; i++) {
 		sp_banks[i].base_addr = reg[i].phys_addr;
 		sp_banks[i].num_bytes = reg[i].reg_size;
+		memblock_add(reg[i].phys_addr, reg[i].reg_size & PAGE_MASK);
 	}
 
 	return num_ents;
-- 
2.43.0