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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: stefan.wahren@i2se.com, f.fainelli@gmail.com,
	catalin.marinas@arm.com, phil@raspberrypi.org,
	robin.murphy@arm.com, Jisheng.Zhang@synaptics.com,
	mbrugger@suse.com, will@kernel.org, hch@lst.de,
	Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
	m.szyprowski@samsung.com
Subject: [RFC 1/4] arm64: mm: use arm64_dma_phys_limit instead of calling max_zone_dma_phys()
Date: Wed, 17 Jul 2019 17:31:32 +0200
Message-ID: <20190717153135.15507-2-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20190717153135.15507-1-nsaenzjulienne@suse.de>

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@suse.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


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Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-17 15:31 [RFC 0/4] Raspberry Pi 4 DMA addressing support Nicolas Saenz Julienne
2019-07-17 15:31 ` Nicolas Saenz Julienne [this message]
2019-07-17 15:31 ` [RFC 2/4] arm64: mm: parse dma-ranges in order to better estimate arm64_dma_phys_limit Nicolas Saenz Julienne
2019-07-24 13:54   ` Catalin Marinas
2019-07-17 15:31 ` [RFC 3/4] dma-direct: add dma_direct_min_mask Nicolas Saenz Julienne
2019-07-18  9:15   ` Christoph Hellwig
2019-07-18 11:18     ` Nicolas Saenz Julienne
2019-07-19 13:08       ` Nicolas Saenz Julienne
2019-07-24 13:51         ` Catalin Marinas
2019-07-24 13:56           ` Christoph Hellwig
2019-07-24 14:27             ` Nicolas Saenz Julienne
2019-07-17 15:31 ` [RFC 4/4] arm64: mm: set direct_dma_min_mask according to dma-ranges Nicolas Saenz Julienne

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