linux-kernel - [PATCH v3 10/26] x86/numa: simplify numa

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Message-ID: <20240801060826.559858-11-rppt@kernel.org>
Date: Thu,  1 Aug 2024 09:08:10 +0300
From: Mike Rapoport <rppt@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>,
	Andreas Larsson <andreas@...sler.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
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	Catalin Marinas <catalin.marinas@....com>,
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	Davidlohr Bueso <dave@...olabs.net>,
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	Heiko Carstens <hca@...ux.ibm.com>,
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	Michael Ellerman <mpe@...erman.id.au>,
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	Thomas Gleixner <tglx@...utronix.de>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Will Deacon <will@...nel.org>,
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Subject: [PATCH v3 10/26] x86/numa: simplify numa_distance allocation

From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>

Allocation of numa_distance uses memblock_phys_alloc_range() to limit
allocation to be below the last mapped page.

But NUMA initializaition runs after the direct map is populated and
there is also code in setup_arch() that adjusts memblock limit to
reflect how much memory is already mapped in the direct map.

Simplify the allocation of numa_distance and use plain memblock_alloc().

Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
Tested-by: Zi Yan <ziy@...dia.com> # for x86_64 and arm64
---
 arch/x86/mm/numa.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 5e1dde26674b..edfc38803779 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -331,7 +331,6 @@ static int __init numa_alloc_distance(void)
 	nodemask_t nodes_parsed;
 	size_t size;
 	int i, j, cnt = 0;
-	u64 phys;
 
 	/* size the new table and allocate it */
 	nodes_parsed = numa_nodes_parsed;
@@ -342,16 +341,14 @@ static int __init numa_alloc_distance(void)
 	cnt++;
 	size = cnt * cnt * sizeof(numa_distance[0]);
 
-	phys = memblock_phys_alloc_range(size, PAGE_SIZE, 0,
-					 PFN_PHYS(max_pfn_mapped));
-	if (!phys) {
+	numa_distance = memblock_alloc(size, PAGE_SIZE);
+	if (!numa_distance) {
 		pr_warn("Warning: can't allocate distance table!\n");
 		/* don't retry until explicitly reset */
 		numa_distance = (void *)1LU;
 		return -ENOMEM;
 	}
 
-	numa_distance = __va(phys);
 	numa_distance_cnt = cnt;
 
 	/* fill with the default distances */
-- 
2.43.0