[PATCH] efi: don't issue error message when booted under xen

[PATCH] efi: don't issue error message when booted under xen

[Juergen Gross]

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

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/platform/efi/quirks.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index 26615991d69c..e0cf95a83f3f 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -360,6 +360,9 @@ 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) {
-- 
2.12.0

Re: [PATCH] efi: don't issue error message when booted under xen

[Matt Fleming]

On Mon, 08 May, at 02:56:33PM, Juergen Gross wrote:
> 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
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
>  arch/x86/platform/efi/quirks.c | 3 +++
>  1 file changed, 3 insertions(+)

Thanks. I've applied this for the urgent branch because it's trivial
and we've had issues before where these kinds of error messages mess
up an otherwise clean boot screen.