diff options
Diffstat (limited to 'target/linux/brcm47xx/patches-4.4/310-no_highpage.patch')
| -rw-r--r-- | target/linux/brcm47xx/patches-4.4/310-no_highpage.patch | 74 |
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) |