From 339e71cbd3f86e5901f600a6bb32c9d2613f3793 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 24 Jul 2023 14:43:03 +0200 Subject: [PATCH] kernel: drop mips highmem offset start overrides 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 (cherry picked from commit a110de8152df46a1e2adf7010ba75fb3b1236cd8) --- .../307-mips_highmem_offset.patch | 19 ------------------- .../120-highmem-start-offset.patch | 19 ------------------- 2 files changed, 38 deletions(-) delete mode 100644 target/linux/generic/pending-5.15/307-mips_highmem_offset.patch delete mode 100644 target/linux/ramips/patches-5.15/120-highmem-start-offset.patch diff --git a/target/linux/generic/pending-5.15/307-mips_highmem_offset.patch b/target/linux/generic/pending-5.15/307-mips_highmem_offset.patch deleted file mode 100644 index 0529b0c5c8..0000000000 --- a/target/linux/generic/pending-5.15/307-mips_highmem_offset.patch +++ /dev/null @@ -1,19 +0,0 @@ -From: Felix Fietkau -Subject: kernel: adjust mips highmem offset to avoid the need for -mlong-calls on systems with >256M RAM - -Signed-off-by: Felix Fietkau ---- - 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 */ diff --git a/target/linux/ramips/patches-5.15/120-highmem-start-offset.patch b/target/linux/ramips/patches-5.15/120-highmem-start-offset.patch deleted file mode 100644 index 629c7bfa5c..0000000000 --- a/target/linux/ramips/patches-5.15/120-highmem-start-offset.patch +++ /dev/null @@ -1,19 +0,0 @@ -From: Felix Fietkau -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 ---- ---- 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 - #endif -- 2.30.2