kernel: adjust mips highmem offset to avoid the need for -mlong-calls on systems with >256M RAM

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 45891

target/linux/generic/patches-3.18/307-mips_highmem_offset.patch

@@ -0,0 +1,17 @@
+Adjust highmem offset to 0x10000000 to ensure that all kmalloc allocations
+stay within the same 256M boundary. This ensures that -mlong-calls is not
+needed on systems with more than 256M RAM.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+--- a/arch/mips/include/asm/mach-generic/spaces.h
++++ b/arch/mips/include/asm/mach-generic/spaces.h
+@@ -44,7 +44,7 @@
+  * 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 */

target/linux/generic/patches-4.0/307-mips_highmem_offset.patch

@@ -0,0 +1,17 @@
+Adjust highmem offset to 0x10000000 to ensure that all kmalloc allocations
+stay within the same 256M boundary. This ensures that -mlong-calls is not
+needed on systems with more than 256M RAM.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+--- a/arch/mips/include/asm/mach-generic/spaces.h
++++ b/arch/mips/include/asm/mach-generic/spaces.h
+@@ -44,7 +44,7 @@
+  * 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 */