arch, drivers: replace for_each_membock() with for_each_mem_range()

There are several occurrences of the following pattern:

	for_each_memblock(memory, reg) {
		start = __pfn_to_phys(memblock_region_memory_base_pfn(reg);
		end = __pfn_to_phys(memblock_region_memory_end_pfn(reg));

		/* do something with start and end */
	}

Using for_each_mem_range() iterator is more appropriate in such cases and
allows simpler and cleaner code.

[akpm@linux-foundation.org: fix arch/arm/mm/pmsa-v7.c build]
[rppt@linux.ibm.com: mips: fix cavium-octeon build caused by memblock refactoring]
  Link: http://lkml.kernel.org/r/20200827124549.GD167163@linux.ibm.com

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Emil Renner Berthing <kernel@esmil.dk>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: https://lkml.kernel.org/r/20200818151634.14343-13-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 6 deletions

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index d8e18cdd96d3..3f65d0ac9f63 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -843,20 +843,26 @@ early_param("mem", early_mem);
 
 static void __init request_standard_resources(const struct machine_desc *mdesc)
 {
-	struct memblock_region *region;
+	phys_addr_t start, end, res_end;
 	struct resource *res;
+	u64 i;
 
 	kernel_code.start   = virt_to_phys(_text);
 	kernel_code.end     = virt_to_phys(__init_begin - 1);
 	kernel_data.start   = virt_to_phys(_sdata);
 	kernel_data.end     = virt_to_phys(_end - 1);
 
-	for_each_memblock(memory, region) {
-		phys_addr_t start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
-		phys_addr_t end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+	for_each_mem_range(i, &start, &end) {
 		unsigned long boot_alias_start;
 
 		/*
+		 * In memblock, end points to the first byte after the
+		 * range while in resourses, end points to the last byte in
+		 * the range.
+		 */
+		res_end = end - 1;
+
+		/*
 		 * Some systems have a special memory alias which is only
 		 * used for booting.  We need to advertise this region to
 		 * kexec-tools so they know where bootable RAM is located.
@@ -869,7 +875,7 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 				      __func__, sizeof(*res));
 			res->name = "System RAM (boot alias)";
 			res->start = boot_alias_start;
-			res->end = phys_to_idmap(end);
+			res->end = phys_to_idmap(res_end);
 			res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 			request_resource(&iomem_resource, res);
 		}
@@ -880,7 +886,7 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 			      sizeof(*res));
 		res->name  = "System RAM";
 		res->start = start;
-		res->end = end;
+		res->end = res_end;
 		res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 
 		request_resource(&iomem_resource, res);