patch-2.4.3 linux/include/linux/mm.h

• Lines: 53
• Date: Mon Mar 26 15:48:13 2001
• Orig file: v2.4.2/linux/include/linux/mm.h
• Orig date: Wed Feb 21 18:20:45 2001

diff -u --recursive --new-file v2.4.2/linux/include/linux/mm.h linux/include/linux/mm.h
@@ -395,12 +395,26 @@
 extern int zeromap_page_range(unsigned long from, unsigned long size, pgprot_t prot);
 
 extern void vmtruncate(struct inode * inode, loff_t offset);
+extern pmd_t *FASTCALL(__pmd_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address));
+extern pte_t *FASTCALL(pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address));
 extern int handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma, unsigned long address, int write_access);
 extern int make_pages_present(unsigned long addr, unsigned long end);
 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
 extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char *dst, int len);
 extern int ptrace_writedata(struct task_struct *tsk, char * src, unsigned long dst, int len);
 
+/*
+ * On a two-level page table, this ends up being trivial. Thus the
+ * inlining and the symmetry break with pte_alloc() that does all
+ * of this out-of-line.
+ */
+static inline pmd_t *pmd_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
+{
+	if (!pgd_present(*pgd))
+		return __pmd_alloc(mm, pgd, address);
+	return pmd_offset(pgd, address);
+}
+
 extern int pgt_cache_water[2];
 extern int check_pgt_cache(void);
 
@@ -481,11 +495,6 @@
 
 #define GFP_DMA		__GFP_DMA
 
-/* Flag - indicates that the buffer can be taken from high memory which is not
-   permanently mapped by the kernel */
-
-#define GFP_HIGHMEM	__GFP_HIGHMEM
-
 /* vma is the first one with  address < vma->vm_end,
  * and even  address < vma->vm_start. Have to extend vma. */
 static inline int expand_stack(struct vm_area_struct * vma, unsigned long address)
@@ -497,11 +506,13 @@
 	if (vma->vm_end - address > current->rlim[RLIMIT_STACK].rlim_cur ||
 	    ((vma->vm_mm->total_vm + grow) << PAGE_SHIFT) > current->rlim[RLIMIT_AS].rlim_cur)
 		return -ENOMEM;
+	spin_lock(&vma->vm_mm->page_table_lock);
 	vma->vm_start = address;
 	vma->vm_pgoff -= grow;
 	vma->vm_mm->total_vm += grow;
 	if (vma->vm_flags & VM_LOCKED)
 		vma->vm_mm->locked_vm += grow;
+	spin_unlock(&vma->vm_mm->page_table_lock);
 	return 0;
 }