linux-kernel - [PATCH] arm64/hugetlb: fix CMA gigantic page order for non-4K PAGE

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Date:   Tue,  5 Oct 2021 13:25:29 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Anshuman Khandual <anshuman.khandual@....com>
Cc:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Barry Song <song.bao.hua@...ilicon.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>, stable@...r.kernel.org
Subject: [PATCH] arm64/hugetlb: fix CMA gigantic page order for non-4K PAGE_SIZE

For non-4K PAGE_SIZE configs, the largest gigantic huge page size is
CONT_PMD_SHIFT order.

Fixes: abb7962adc80 ("arm64/hugetlb: Reserve CMA areas for gigantic
pages on 16K and 64K configs")
Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
Cc: <stable@...r.kernel.org>
---
 arch/arm64/mm/hugetlbpage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 23505fc35324..a8158c948966 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -43,7 +43,7 @@ void __init arm64_hugetlb_cma_reserve(void)
 #ifdef CONFIG_ARM64_4K_PAGES
 	order = PUD_SHIFT - PAGE_SHIFT;
 #else
-	order = CONT_PMD_SHIFT + PMD_SHIFT - PAGE_SHIFT;
+	order = CONT_PMD_SHIFT - PAGE_SHIFT;
 #endif
 	/*
 	 * HugeTLB CMA reservation is required for gigantic
-- 
2.31.1