[PATCH 1/5] sparc32: use memblock when mapping the kernel

[Magnus Lindholm <linmag7@gmail.com>]

memblock already contains the available memory ranges when map_kernel()
runs. Iterate those ranges directly and remove the sp_banks-specific
mapping helper. memblock range ends are exclusive, so use end - start as
the range size.

Suggested-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
---
 arch/sparc/mm/srmmu.c | 47 +++++++++++++++++++------------------------
 1 file changed, 21 insertions(+), 26 deletions(-)

diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index f0fe09169528..483235458d69 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -846,39 +846,34 @@ static void __init do_large_mapping(unsigned long vaddr, unsigned long phys_base
 	*__nocache_fix(pgdp) = __pgd(big_pte);
 }
 
-/* Map sp_bank entry SP_ENTRY, starting at virtual address VBASE. */
-static unsigned long __init map_spbank(unsigned long vbase, int sp_entry)
-{
-	unsigned long pstart = (sp_banks[sp_entry].base_addr & PGDIR_MASK);
-	unsigned long vstart = (vbase & PGDIR_MASK);
-	unsigned long vend = PGDIR_ALIGN(vbase + sp_banks[sp_entry].num_bytes);
-	/* Map "low" memory only */
-	const unsigned long min_vaddr = PAGE_OFFSET;
-	const unsigned long max_vaddr = PAGE_OFFSET + SRMMU_MAXMEM;
-
-	if (vstart < min_vaddr || vstart >= max_vaddr)
-		return vstart;
-
-	if (vend > max_vaddr || vend < min_vaddr)
-		vend = max_vaddr;
-
-	while (vstart < vend) {
-		do_large_mapping(vstart, pstart);
-		vstart += PGDIR_SIZE; pstart += PGDIR_SIZE;
-	}
-	return vstart;
-}
-
 static void __init map_kernel(void)
 {
-	int i;
+	phys_addr_t start, end;
+	u64 i;
 
 	if (phys_base > 0) {
 		do_large_mapping(PAGE_OFFSET, phys_base);
 	}
 
-	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
-		map_spbank((unsigned long)__va(sp_banks[i].base_addr), i);
+	for_each_mem_range(i, &start, &end) {
+		unsigned long vbase = (unsigned long)__va(start);
+		unsigned long pstart = start & PGDIR_MASK;
+		unsigned long vstart = vbase & PGDIR_MASK;
+		unsigned long vend = PGDIR_ALIGN(vbase + end - start);
+		const unsigned long min_vaddr = PAGE_OFFSET;
+		const unsigned long max_vaddr = PAGE_OFFSET + SRMMU_MAXMEM;
+
+		/* Map low memory only. */
+		if (vstart < min_vaddr || vstart >= max_vaddr)
+			continue;
+		if (vend > max_vaddr || vend < min_vaddr)
+			vend = max_vaddr;
+
+		while (vstart < vend) {
+			do_large_mapping(vstart, pstart);
+			vstart += PGDIR_SIZE;
+			pstart += PGDIR_SIZE;
+		}
 	}
 }
 
-- 
2.43.0