mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
29 lines
1.1 KiB
Diff
29 lines
1.1 KiB
Diff
From 0ac4d5d1e10d61849aa856e6de3a0e48f534adcf Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
|
Date: Wed, 21 Feb 2024 14:16:21 +0000
|
|
Subject: [PATCH 419/697] arm64/Kconfig: Don't set DMA_BOUNCE_UNALIGNED_KMALLOC
|
|
|
|
If enabled, DMA_BOUNCE_UNALIGNED_KMALLOC causes the swiotlb buffers
|
|
(64MB, by default) to be allocated, even on systems where the DMA
|
|
controller can reach all of RAM. This is a huge amount of RAM to
|
|
waste on a device with only 512MB to start with, such as the Zero 2 W.
|
|
|
|
See: https://github.com/raspberrypi/linux/issues/5975
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
|
|
---
|
|
arch/arm64/Kconfig | 3 ++-
|
|
1 file changed, 2 insertions(+), 1 deletion(-)
|
|
|
|
--- a/arch/arm64/Kconfig
|
|
+++ b/arch/arm64/Kconfig
|
|
@@ -130,7 +130,8 @@ config ARM64
|
|
select CRC32
|
|
select DCACHE_WORD_ACCESS
|
|
select DYNAMIC_FTRACE if FUNCTION_TRACER
|
|
- select DMA_BOUNCE_UNALIGNED_KMALLOC
|
|
+ # Disable this to save 64MB when DMA controllers can reach all of RAM
|
|
+ # select DMA_BOUNCE_UNALIGNED_KMALLOC
|
|
select DMA_DIRECT_REMAP
|
|
select EDAC_SUPPORT
|
|
select FRAME_POINTER
|