linux-kernel - [PATCH v3 05/17] h8300, nds32, openrisc: simplify detection of memory extents

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Date:   Tue, 18 Aug 2020 18:16:22 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>, Baoquan He <bhe@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>, Daniel Axtens <dja@...ens.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Ingo Molnar <mingo@...hat.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <monstr@...str.eu>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Rapoport <rppt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Russell King <linux@...linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        clang-built-linux@...glegroups.com,
        iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linuxppc-dev@...ts.ozlabs.org,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, x86@...nel.org
Subject: [PATCH v3 05/17] h8300, nds32, openrisc: simplify detection of memory extents

From: Mike Rapoport <rppt@...ux.ibm.com>

Instead of traversing memblock.memory regions to find memory_start and
memory_end, simply query memblock_{start,end}_of_DRAM().

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Acked-by: Stafford Horne <shorne@...il.com>
---
 arch/h8300/kernel/setup.c    | 8 +++-----
 arch/nds32/kernel/setup.c    | 8 ++------
 arch/openrisc/kernel/setup.c | 9 ++-------
 3 files changed, 7 insertions(+), 18 deletions(-)

diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c
index 28ac88358a89..0281f92eea3d 100644
--- a/arch/h8300/kernel/setup.c
+++ b/arch/h8300/kernel/setup.c
@@ -74,17 +74,15 @@ static void __init bootmem_init(void)
 	memory_end = memory_start = 0;
 
 	/* Find main memory where is the kernel */
-	for_each_memblock(memory, region) {
-		memory_start = region->base;
-		memory_end = region->base + region->size;
-	}
+	memory_start = memblock_start_of_DRAM();
+	memory_end = memblock_end_of_DRAM();
 
 	if (!memory_end)
 		panic("No memory!");
 
 	/* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
 	min_low_pfn = PFN_UP(memory_start);
-	max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
+	max_low_pfn = PFN_DOWN(memory_end);
 	max_pfn = max_low_pfn;
 
 	memblock_reserve(__pa(_stext), _end - _stext);
diff --git a/arch/nds32/kernel/setup.c b/arch/nds32/kernel/setup.c
index a066efbe53c0..c356e484dcab 100644
--- a/arch/nds32/kernel/setup.c
+++ b/arch/nds32/kernel/setup.c
@@ -249,12 +249,8 @@ static void __init setup_memory(void)
 	memory_end = memory_start = 0;
 
 	/* Find main memory where is the kernel */
-	for_each_memblock(memory, region) {
-		memory_start = region->base;
-		memory_end = region->base + region->size;
-		pr_info("%s: Memory: 0x%x-0x%x\n", __func__,
-			memory_start, memory_end);
-	}
+	memory_start = memblock_start_of_DRAM();
+	memory_end = memblock_end_of_DRAM();
 
 	if (!memory_end) {
 		panic("No memory!");
diff --git a/arch/openrisc/kernel/setup.c b/arch/openrisc/kernel/setup.c
index b18e775f8be3..5a5940f7ebb1 100644
--- a/arch/openrisc/kernel/setup.c
+++ b/arch/openrisc/kernel/setup.c
@@ -48,17 +48,12 @@ static void __init setup_memory(void)
 	unsigned long ram_start_pfn;
 	unsigned long ram_end_pfn;
 	phys_addr_t memory_start, memory_end;
-	struct memblock_region *region;
 
 	memory_end = memory_start = 0;
 
 	/* Find main memory where is the kernel, we assume its the only one */
-	for_each_memblock(memory, region) {
-		memory_start = region->base;
-		memory_end = region->base + region->size;
-		printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
-		       memory_start, memory_end);
-	}
+	memory_start = memblock_start_of_DRAM();
+	memory_end = memblock_end_of_DRAM();
 
 	if (!memory_end) {
 		panic("No memory!");
-- 
2.26.2