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-rw-r--r--target/linux/brcm47xx/patches-4.4/310-no_highpage.patch74
1 files changed, 74 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-4.4/310-no_highpage.patch b/target/linux/brcm47xx/patches-4.4/310-no_highpage.patch
new file mode 100644
index 0000000000..bb67417f90
--- /dev/null
+++ b/target/linux/brcm47xx/patches-4.4/310-no_highpage.patch
@@ -0,0 +1,74 @@
+From: Jeff Hansen <jhansen@cardaccess-inc.com>
+Subject: [PATCH] no highpage
+
+On ASUS WL-500gP there are many unexpected "Segmentation fault"s that
+seem to be caused by a kernel. They can be avoided by:
+1) Disabling highpage
+2) Using flush_cache_mm in flush_cache_dup_mm
+
+For details see OpenWrt ticket #2035 https://dev.openwrt.org/ticket/2035
+---
+--- a/arch/mips/include/asm/page.h
++++ b/arch/mips/include/asm/page.h
+@@ -71,6 +71,7 @@ static inline unsigned int page_size_ftl
+ #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
+
+ #include <linux/pfn.h>
++#include <asm/cpu-features.h>
+
+ extern void build_clear_page(void);
+ extern void build_copy_page(void);
+@@ -105,11 +106,16 @@ static inline void clear_user_page(void
+ flush_data_cache_page((unsigned long)addr);
+ }
+
+-struct vm_area_struct;
+-extern void copy_user_highpage(struct page *to, struct page *from,
+- unsigned long vaddr, struct vm_area_struct *vma);
++static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
++ struct page *to)
++{
++ extern void (*flush_data_cache_page)(unsigned long addr);
+
+-#define __HAVE_ARCH_COPY_USER_HIGHPAGE
++ copy_page(vto, vfrom);
++ if (!cpu_has_ic_fills_f_dc ||
++ pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
++ flush_data_cache_page((unsigned long)vto);
++}
+
+ /*
+ * These are used to make use of C type-checking..
+--- a/arch/mips/mm/init.c
++++ b/arch/mips/mm/init.c
+@@ -158,30 +158,6 @@ void kunmap_coherent(void)
+ preempt_enable();
+ }
+
+-void copy_user_highpage(struct page *to, struct page *from,
+- unsigned long vaddr, struct vm_area_struct *vma)
+-{
+- void *vfrom, *vto;
+-
+- vto = kmap_atomic(to);
+- if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
+- page_mapped(from) && !Page_dcache_dirty(from)) {
+- vfrom = kmap_coherent(from, vaddr);
+- copy_page(vto, vfrom);
+- kunmap_coherent();
+- } else {
+- vfrom = kmap_atomic(from);
+- copy_page(vto, vfrom);
+- kunmap_atomic(vfrom);
+- }
+- if ((!cpu_has_ic_fills_f_dc) ||
+- pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
+- flush_data_cache_page((unsigned long)vto);
+- kunmap_atomic(vto);
+- /* Make sure this page is cleared on other CPU's too before using it */
+- smp_wmb();
+-}
+-
+ void copy_to_user_page(struct vm_area_struct *vma,
+ struct page *page, unsigned long vaddr, void *dst, const void *src,
+ unsigned long len)