linux-kernel - [RFC 1/4] arm64: mm: use arm64_dma_phys_limit instead of calling max_zone_dma

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Message-Id: <20190717153135.15507-2-nsaenzjulienne@suse.de>
Date:   Wed, 17 Jul 2019 17:31:32 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     catalin.marinas@....com, will@...nel.org, robin.murphy@....com,
        m.szyprowski@...sung.com, hch@....de, phil@...pberrypi.org,
        stefan.wahren@...e.com, f.fainelli@...il.com, mbrugger@...e.com,
        Jisheng.Zhang@...aptics.com,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: [RFC 1/4] arm64: mm: use arm64_dma_phys_limit instead of calling max_zone_dma_phys()

By the time we call zones_sizes_init() arm64_dma_phys_limit already
contains the result of max_zone_dma_phys(). We use the variable instead
of calling the function directly to save some precious cpu time.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 arch/arm64/mm/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f3c795278def..6112d6c90fa8 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -181,7 +181,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
 	unsigned long max_zone_pfns[MAX_NR_ZONES]  = {0};
 
 #ifdef CONFIG_ZONE_DMA32
-	max_zone_pfns[ZONE_DMA32] = PFN_DOWN(max_zone_dma_phys());
+	max_zone_pfns[ZONE_DMA32] = PFN_DOWN(arm64_dma_phys_limit);
 #endif
 	max_zone_pfns[ZONE_NORMAL] = max;
 
-- 
2.22.0