makedumpfile: disable mmap read

There's a kernel bug for mapping mem ranges which end with

an address not aligned to page boundry. It's still not resolved

in upstream, so let's disable mmap read for now as a workaround.

Once upstream got a right fix we can revert this patch.

Signed-off-by: Dave Young <dyoung@redhat.com>

---

 makedumpfile.c |    7 +++++++

 1 file changed, 7 insertions(+)

--- kexec-tools/makedumpfile-1.5.4/makedumpfile.c.orig

+++ kexec-tools/makedumpfile-1.5.4/makedumpfile.c

@@ -3144,6 +3144,12 @@ out:

 	if (info->dump_level & DL_EXCLUDE_FREE)

 		setup_page_is_buddy();

+	/* There's a kernel bug for mapping mem ranges which end with

+	 * an address not aligned to page boundry. It's still not resolved

+	 * in upstream, so let's disable mmap read for now.

+	 */

+	info->flag_usemmap = FALSE;

+#if 0

 	if (!initialize_mmap()) {

 		/* this kernel does not support mmap of vmcore */

 		DEBUG_MSG("Kernel can't mmap vmcore, using reads.\n");

@@ -3152,6 +3158,7 @@ out:

 		DEBUG_MSG("read %s with mmap()\n", info->name_memory);

 		info->flag_usemmap = TRUE;

 	}

+#endif

 	return TRUE;

 }