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Subject[patch] vmalloc_to_page() backport for 2.4
  Hi,

This is a 2.4.x backport of the new 2.5.x vmalloc_to_page() function.
I'd like to see that function in 2.4.x too because it makes driver
maintaining easier.

Gerd

==============================[ cut here ]==============================
--- linux-2.4.19-pre3/include/linux/mm.h Tue Mar 12 09:59:02 2002
+++ linux/include/linux/mm.h Tue Mar 12 18:15:02 2002
@@ -670,6 +670,8 @@

extern struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr);

+extern struct page * vmalloc_to_page(void *addr);
+
#endif /* __KERNEL__ */

#endif
--- linux-2.4.19-pre3/kernel/ksyms.c Tue Mar 12 10:00:44 2002
+++ linux/kernel/ksyms.c Tue Mar 12 10:00:44 2002
@@ -108,6 +108,7 @@
EXPORT_SYMBOL(kfree);
EXPORT_SYMBOL(vfree);
EXPORT_SYMBOL(__vmalloc);
+EXPORT_SYMBOL_GPL(vmalloc_to_page);
EXPORT_SYMBOL(mem_map);
EXPORT_SYMBOL(remap_page_range);
EXPORT_SYMBOL(max_mapnr);
--- linux-2.4.19-pre3/mm/memory.c Tue Mar 12 09:59:02 2002
+++ linux/mm/memory.c Tue Mar 12 10:00:44 2002
@@ -1471,3 +1471,24 @@
len, write, 0, NULL, NULL);
return ret == len ? 0 : -1;
}
+
+struct page * vmalloc_to_page(void * vmalloc_addr)
+{
+ unsigned long addr = (unsigned long) vmalloc_addr;
+ struct page *page = NULL;
+ pmd_t *pmd;
+ pte_t *pte;
+ pgd_t *pgd;
+
+ pgd = pgd_offset_k(addr);
+ if (!pgd_none(*pgd)) {
+ pmd = pmd_offset(pgd, addr);
+ if (!pmd_none(*pmd)) {
+ pte = pte_offset(pmd, addr);
+ if (pte_present(*pte)) {
+ page = pte_page(*pte);
+ }
+ }
+ }
+ return page;
+}
-
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