From 79dbc09e09d48ebb4a087f003789a8bf22d2cc13 Mon Sep 17 00:00:00 2001
From: Holger Waechtler <devnull@localhost>
Date: Fri, 24 Jan 2003 12:26:47 +0000
Subject: implement vmalloc_to_page() again in order to maintain backward
 compatibility

---
 linux/drivers/media/dvb/dvb-core/compat.c | 23 +++++++++++++++++++++++
 linux/drivers/media/dvb/dvb-core/compat.h |  7 +++++++
 2 files changed, 30 insertions(+)

(limited to 'linux')

diff --git a/linux/drivers/media/dvb/dvb-core/compat.c b/linux/drivers/media/dvb/dvb-core/compat.c
index 40280c8aa..255d89616 100644
--- a/linux/drivers/media/dvb/dvb-core/compat.c
+++ b/linux/drivers/media/dvb/dvb-core/compat.c
@@ -128,3 +128,26 @@ EXPORT_SYMBOL(crc32_le);
 
 #endif
 
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+struct page * vmalloc_to_page(void *vmalloc_addr)
+{
+	unsigned long addr = (unsigned long) vmalloc_addr;
+	struct page *page = NULL;
+	pgd_t *pgd = pgd_offset_k(addr);
+	pmd_t *pmd;
+	pte_t *ptep, pte;
+
+	if (!pgd_none(*pgd)) {
+		pmd = pmd_offset(pgd, addr);
+		if (!pmd_none(*pmd)) {
+			ptep = pte_offset(pmd, addr);
+			pte = *ptep;
+			if (pte_present(pte))
+				page = pte_page(pte);
+		}
+	}
+	return page;
+}
+EXPORT_SYMBOL(vmalloc_to_page);
+#endif
+
diff --git a/linux/drivers/media/dvb/dvb-core/compat.h b/linux/drivers/media/dvb/dvb-core/compat.h
index 2e38e0042..49f32ecbd 100644
--- a/linux/drivers/media/dvb/dvb-core/compat.h
+++ b/linux/drivers/media/dvb/dvb-core/compat.h
@@ -80,5 +80,12 @@ int try_module_get(struct module *mod)
 #endif
 
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+
+extern struct page * vmalloc_to_page(void *addr);
+
+#endif
+
+
 #endif
 
-- 
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