Patch "efi: Don't issue error message when booted under Xen" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

efi: Don't issue error message when booted under Xen

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
efi-don-t-issue-error-message-when-booted-under-xen.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Juergen Gross <[email protected]>
Date: Fri, 26 May 2017 12:36:47 +0100
Subject: efi: Don't issue error message when booted under Xen

From: Juergen Gross <[email protected]>

commit 1ea34adb87c969b89dfd83f1905a79161e9ada26 upstream.

When booted as Xen dom0 there won't be an EFI memmap allocated. Avoid issuing an error message in this case:

  [    0.144079] efi: Failed to allocate new EFI memmap

---
 arch/x86/platform/efi/quirks.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -358,6 +358,9 @@ void __init efi_free_boot_services(void)
 		free_bootmem_late(start, size);
 	}
 
+	if (!num_entries)
+		return;
+
 	new_size = efi.memmap.desc_size * num_entries;
 	new_phys = efi_memmap_alloc(num_entries);
 	if (!new_phys) {

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/efi-don-t-issue-error-message-when-booted-under-xen.patch