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kernel: drop mips highmem offset start overrides

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The maximum offset that can be supported is 0x20000000
Do not override it to to something bigger than that on MT7621, as that could
cause issues based on the fixed memory mappings. This makes the last 64 MB
RAM unusable on MT7621 devices with 512 MB but avoids incurring a heavy
performance hit

Fixes: cd2b74e01e8d ("ramips: mt7621: disable highmem support and remove highmem offset patch")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit a110de8152df46a1e2adf7010ba75fb3b1236cd8)
This commit is contained in:
Felix Fietkau 2023-07-24 14:43:03 +02:00
parent e5dea9e37f
commit 339e71cbd3
2 changed files with 0 additions and 38 deletions
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19
target/linux/generic/pending-5.15/307-mips_highmem_offset.patch
View File

@ -1,19 +0,0 @@
From: Felix Fietkau <nbd@nbd.name>
Subject: kernel: adjust mips highmem offset to avoid the need for -mlong-calls on systems with >256M RAM
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
arch/mips/include/asm/mach-generic/spaces.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/include/asm/mach-generic/spaces.h
+++ b/arch/mips/include/asm/mach-generic/spaces.h
@@ -46,7 +46,7 @@
* Memory above this physical address will be considered highmem.
*/
#ifndef HIGHMEM_START
-#define HIGHMEM_START _AC(0x20000000, UL)
+#define HIGHMEM_START _AC(0x10000000, UL)
#endif
#endif /* CONFIG_32BIT */

19
target/linux/ramips/patches-5.15/120-highmem-start-offset.patch
View File

@ -1,19 +0,0 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Mon Jul 24 13:29:13 CEST 2023
Subject: [PATCH] mips: ralink: increase highmem start
Increase highmem start address in order to support devices with 512 MB memory
and MT7621 SoC
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/arch/mips/include/asm/mach-ralink/spaces.h
+++ b/arch/mips/include/asm/mach-ralink/spaces.h
@@ -5,6 +5,7 @@
#define PCI_IOBASE _AC(0xa0000000, UL)
#define PCI_IOSIZE SZ_16M
#define IO_SPACE_LIMIT (PCI_IOSIZE - 1)
+#define HIGHMEM_START _AC(0x24000000, UL)
#include <asm/mach-generic/spaces.h>
#endif