linux-kernel - [PATCH v2 7/9] mm: Calc the right pfn if page size is not 4K

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Date:   Thu, 14 Apr 2022 18:13:12 +0800
From:   Wupeng Ma <mawupeng1@...wei.com>
To:     <akpm@...ux-foundation.org>, <catalin.marinas@....com>,
        <will@...nel.org>, <corbet@....net>
CC:     <ardb@...nel.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
        <bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        <hpa@...cr.com>, <dvhart@...radead.org>, <andy@...radead.org>,
        <rppt@...nel.org>, <paulmck@...nel.org>, <peterz@...radead.org>,
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        <david@...hat.com>, <gpiccoli@...lia.com>, <mark.rutland@....com>,
        <wangkefeng.wang@...wei.com>, <mawupeng1@...wei.com>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-efi@...r.kernel.org>, <linux-ia64@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH v2 7/9] mm: Calc the right pfn if page size is not 4K

From: Ma Wupeng <mawupeng1@...wei.com>

Previous 0x100000 is used to check the 4G limit in
find_zone_movable_pfns_for_nodes(). This is right in x86 because
the page size can only be 4K. But 16K and 64K are available in
arm64. So replace it with PHYS_PFN(SZ_4G).

Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6e5b4488a0c5..570d0ebf98df 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7870,7 +7870,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
 
 			usable_startpfn = memblock_region_memory_base_pfn(r);
 
-			if (usable_startpfn < 0x100000) {
+			if (usable_startpfn < PHYS_PFN(SZ_4G)) {
 				mem_below_4gb_not_mirrored = true;
 				continue;
 			}
-- 
2.18.0.huawei.25