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

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Date:   Mon,  8 May 2017 14:56:33 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        x86@...nel.org
Cc:     hpa@...or.com, mingo@...hat.com, tglx@...utronix.de,
        ard.biesheuvel@...aro.org, matt@...eblueprint.co.uk,
        Juergen Gross <jgross@...e.com>
Subject: [PATCH] efi: don't issue error message when booted under xen

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@...e.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