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31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
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From 953f00c3ceb5879d8f0d2f2683d70ff93efedad4 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Wed, 21 Feb 2024 14:16:21 +0000
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Subject: [PATCH 0908/1085] arm64/Kconfig: Don't set
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DMA_BOUNCE_UNALIGNED_KMALLOC
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If enabled, DMA_BOUNCE_UNALIGNED_KMALLOC causes the swiotlb buffers
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(64MB, by default) to be allocated, even on systems where the DMA
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controller can reach all of RAM. This is a huge amount of RAM to
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waste on a device with only 512MB to start with, such as the Zero 2 W.
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See: https://github.com/raspberrypi/linux/issues/5975
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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arch/arm64/Kconfig | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/arch/arm64/Kconfig
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+++ b/arch/arm64/Kconfig
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@@ -122,7 +122,8 @@ config ARM64
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select CRC32
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select DCACHE_WORD_ACCESS
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select DYNAMIC_FTRACE if FUNCTION_TRACER
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- select DMA_BOUNCE_UNALIGNED_KMALLOC
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+ # Disable this to save 64MB when DMA controllers can reach all of RAM
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+ # select DMA_BOUNCE_UNALIGNED_KMALLOC
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select DMA_DIRECT_REMAP
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select EDAC_SUPPORT
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select FRAME_POINTER
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