Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / include / asm-parisc / cacheflush.h

diff --git a/include/asm-parisc/cacheflush.h b/include/asm-parisc/cacheflush.h
index 0673271..76b6b7d 100644 (file)
--- a/include/asm-parisc/cacheflush.h
+++ b/include/asm-parisc/cacheflush.h
@@ -3,6 +3,7 @@
 
 #include <linux/config.h>
 #include <linux/mm.h>
+#include <asm/cache.h> /* for flush_user_dcache_range_asm() proto */
 
 /* The usual comment is "Caches aren't brain-dead on the <architecture>".
  * Unfortunately, that doesn't apply to PA-RISC. */
@@ -61,7 +62,7 @@ extern void flush_dcache_page(struct page *page);
 #define flush_dcache_mmap_unlock(mapping) \
        write_unlock_irq(&(mapping)->tree_lock)
 
-#define flush_icache_page(vma,page)    do { flush_kernel_dcache_page(page_address(page)); flush_kernel_icache_page(page_address(page)); } while (0)
+#define flush_icache_page(vma,page)    do { flush_kernel_dcache_page(page); flush_kernel_icache_page(page_address(page)); } while (0)
 
 #define flush_icache_range(s,e)                do { flush_kernel_dcache_range_asm(s,e); flush_kernel_icache_range_asm(s,e); } while (0)
 
@@ -99,30 +100,34 @@ static inline void flush_cache_range(struct vm_area_struct *vma,
 
 /* Simple function to work out if we have an existing address translation
  * for a user space vma. */
-static inline pte_t *__translation_exists(struct mm_struct *mm,
-                                         unsigned long addr)
+static inline int translation_exists(struct vm_area_struct *vma,
+                               unsigned long addr, unsigned long pfn)
 {
-       pgd_t *pgd = pgd_offset(mm, addr);
+       pgd_t *pgd = pgd_offset(vma->vm_mm, addr);
        pmd_t *pmd;
-       pte_t *pte;
+       pte_t pte;
 
        if(pgd_none(*pgd))
-               return NULL;
+               return 0;
 
        pmd = pmd_offset(pgd, addr);
        if(pmd_none(*pmd) || pmd_bad(*pmd))
-               return NULL;
+               return 0;
 
-       pte = pte_offset_map(pmd, addr);
+       /* We cannot take the pte lock here: flush_cache_page is usually
+        * called with pte lock already held.  Whereas flush_dcache_page
+        * takes flush_dcache_mmap_lock, which is lower in the hierarchy:
+        * the vma itself is secure, but the pte might come or go racily.
+        */
+       pte = *pte_offset_map(pmd, addr);
+       /* But pte_unmap() does nothing on this architecture */
 
-       /* The PA flush mappings show up as pte_none, but they're
-        * valid none the less */
-       if(pte_none(*pte) && ((pte_val(*pte) & _PAGE_FLUSH) == 0))
-               return NULL;
-       return pte;
-}
-#define        translation_exists(vma, addr)   __translation_exists((vma)->vm_mm, addr)
+       /* Filter out coincidental file entries and swap entries */
+       if (!(pte_val(pte) & (_PAGE_FLUSH|_PAGE_PRESENT)))
+               return 0;
 
+       return pte_pfn(pte) == pfn;
+}
 
 /* Private function to flush a page from the cache of a non-current
  * process.  cr25 contains the Page Directory of the current user
@@ -174,9 +179,29 @@ flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long
 {
        BUG_ON(!vma->vm_mm->context);
 
-       if(likely(translation_exists(vma, vmaddr)))
+       if (likely(translation_exists(vma, vmaddr, pfn)))
                __flush_cache_page(vma, vmaddr);
 
 }
+
+static inline void
+flush_anon_page(struct page *page, unsigned long vmaddr)
+{
+       if (PageAnon(page))
+               flush_user_dcache_page(vmaddr);
+}
+#define ARCH_HAS_FLUSH_ANON_PAGE
+
+static inline void
+flush_kernel_dcache_page(struct page *page)
+{
+       flush_kernel_dcache_page_asm(page_address(page));
+}
+#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
+
+#ifdef CONFIG_DEBUG_RODATA
+void mark_rodata_ro(void);
 #endif
 
+#endif /* _PARISC_CACHEFLUSH_H */
+