[RFC/PATCH 12/17][Kdump] Routines for copying dump pages - more fixes

[Vivek Goyal <vgoyal@in.ibm.com>]

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• Subject: No Subject
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• Date: Mon, 28 Mar 2005 17:49:54 +0530

From: "Vivek Goyal" <vgoyal@in.ibm.com>

o Enable copy_oldmem_page() to read from a specific offset, with in a page.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
---

 linux-2.6.12-rc1-mm1-1M-root/include/linux/crash_dump.h |    3 ++-
 linux-2.6.12-rc1-mm1-1M-root/kernel/crash_dump.c        |   10 +++++-----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff -puN include/linux/crash_dump.h~crashdump-routines-for-copying-dump-pages-more-fixes include/linux/crash_dump.h
--- linux-2.6.12-rc1-mm1-1M/include/linux/crash_dump.h~crashdump-routines-for-copying-dump-pages-more-fixes	2005-03-22 16:15:55.000000000 +0530
+++ linux-2.6.12-rc1-mm1-1M-root/include/linux/crash_dump.h	2005-03-22 16:15:55.000000000 +0530
@@ -7,6 +7,7 @@
 #include <linux/device.h>
 #include <linux/proc_fs.h>
 
-extern ssize_t copy_oldmem_page(unsigned long, char *, size_t, int);
+extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
+						unsigned long, int);
 #endif /* CONFIG_CRASH_DUMP */
 #endif /* LINUX_CRASHDUMP_H */
diff -puN kernel/crash_dump.c~crashdump-routines-for-copying-dump-pages-more-fixes kernel/crash_dump.c
--- linux-2.6.12-rc1-mm1-1M/kernel/crash_dump.c~crashdump-routines-for-copying-dump-pages-more-fixes	2005-03-22 16:15:55.000000000 +0530
+++ linux-2.6.12-rc1-mm1-1M-root/kernel/crash_dump.c	2005-03-22 16:15:55.000000000 +0530
@@ -20,7 +20,7 @@
  * in the current kernel. We stitch up a pte, similar to kmap_atomic.
  */
 ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
-				size_t csize, int userbuf)
+				size_t csize, unsigned long offset, int userbuf)
 {
 	void *page, *vaddr;
 
@@ -36,14 +36,14 @@ ssize_t copy_oldmem_page(unsigned long p
 	kunmap_atomic(vaddr, KM_PTE0);
 
 	if (userbuf) {
-		if (copy_to_user(buf, page, csize)) {
+		if (copy_to_user(buf, (page + offset), csize)) {
 			kfree(page);
 			return -EFAULT;
 		}
 	} else {
-		memcpy(buf, page, csize);
+		memcpy(buf, (page + offset), csize);
 	}
-	kfree(page);
 
-	return 0;
+	kfree(page);
+	return csize;
 }
_

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