kexec-tools/kexec-tools-2.0.4-makedumpfile-disable-mmap.patch

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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;
}