mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-24 15:56:49 +00:00
31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
|
From 953f00c3ceb5879d8f0d2f2683d70ff93efedad4 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
||
|
|
Date: Wed, 21 Feb 2024 14:16:21 +0000
|
||
|
|
Subject: [PATCH 0908/1085] 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
|
||
|
|
@@ -122,7 +122,8 @@ 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
|