linux-kernel - [PATCH 04/15] arm64: numa: simplify dummy_numa

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Date:   Tue, 28 Jul 2020 08:11:42 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.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-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 04/15] arm64: numa: simplify dummy_numa_init()

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

dummy_numa_init() loops over memblock.memory and passes nid=0 to
numa_add_memblk() which essentially wraps memblock_set_node(). However,
memblock_set_node() can cope with entire memory span itself, so the loop
over memblock.memory regions is redundant.

Replace the loop with a single call to memblock_set_node() to the entire
memory.

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 arch/arm64/mm/numa.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index aafcee3e3f7e..0cbdbcc885fb 100644
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c
@@ -423,19 +423,16 @@ static int __init numa_init(int (*init_func)(void))
  */
 static int __init dummy_numa_init(void)
 {
+	phys_addr_t start = memblock_start_of_DRAM();
+	phys_addr_t end = memblock_end_of_DRAM();
 	int ret;
-	struct memblock_region *mblk;
 
 	if (numa_off)
 		pr_info("NUMA disabled\n"); /* Forced off on command line. */
-	pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
-		memblock_start_of_DRAM(), memblock_end_of_DRAM() - 1);
-
-	for_each_memblock(memory, mblk) {
-		ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size);
-		if (!ret)
-			continue;
+	pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n", start, end - 1);
 
+	ret = numa_add_memblk(0, start, end);
+	if (ret) {
 		pr_err("NUMA init failed\n");
 		return ret;
 	}
-- 
2.26.2