Finally fix the annoying BCM4704 segfault issues (#2035) - tested with WL-500gP Thanks to jhansen and Wolfram Joost for the fixes and to ryd for the test hardware. Seems like the user space segfaults actually came from this patch: http://lkml.org/lkml/2006/12/12/158

SVN-Revision: 9285

1 files changed, 71 insertions, 0 deletions

diff --git a/target/linux/brcm47xx/patches-2.6.23/310-no_highpage.patch b/target/linux/brcm47xx/patches-2.6.23/310-no_highpage.patch
new file mode 100644
index 0000000..16e7e3f
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.23/310-no_highpage.patch
@@ -0,0 +1,71 @@
+Index: linux-2.6.23/arch/mips/mm/init.c
+===================================================================
+--- linux-2.6.23.orig/arch/mips/mm/init.c	2007-10-13 11:46:58.762489429 +0200
++++ linux-2.6.23/arch/mips/mm/init.c	2007-10-13 11:47:36.092616749 +0200
+@@ -205,31 +205,6 @@
+ 	preempt_check_resched();
+ }
+ 
+-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, KM_USER1);
+-	if (cpu_has_dc_aliases && cpu_use_kmap_coherent && !Page_dcache_dirty(from)) {
+-		vfrom = kmap_coherent(from, vaddr);
+-		copy_page(vto, vfrom);
+-		kunmap_coherent();
+-	} else {
+-		vfrom = kmap_atomic(from, KM_USER0);
+-		copy_page(vto, vfrom);
+-		kunmap_atomic(vfrom, KM_USER0);
+-	}
+-	if (((vma->vm_flags & VM_EXEC) && !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, KM_USER1);
+-	/* Make sure this page is cleared on other CPU's too before using it */
+-	smp_wmb();
+-}
+-
+-EXPORT_SYMBOL(copy_user_highpage);
+-
+ void copy_to_user_page(struct vm_area_struct *vma,
+ 	struct page *page, unsigned long vaddr, void *dst, const void *src,
+ 	unsigned long len)
+Index: linux-2.6.23/include/asm-mips/page.h
+===================================================================
+--- linux-2.6.23.orig/include/asm-mips/page.h	2007-10-13 11:45:50.518600430 +0200
++++ linux-2.6.23/include/asm-mips/page.h	2007-10-13 11:47:26.472068504 +0200
+@@ -35,6 +35,7 @@
+ #ifndef __ASSEMBLY__
+ 
+ #include <linux/pfn.h>
++#include <asm/cpu-features.h>
+ #include <asm/io.h>
+ 
+ /*
+@@ -67,13 +68,16 @@
+ 		flush_data_cache_page((unsigned long)addr);
+ }
+ 
+-extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
+-	struct page *to);
+-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..