linux-kernel - [tip:efi/urgent] efi: Don't issue error message when booted under Xen

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Message-ID: <tip-1ea34adb87c969b89dfd83f1905a79161e9ada26@git.kernel.org>
Date:   Sun, 28 May 2017 02:44:17 -0700
From:   tip-bot for Juergen Gross <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     matt@...eblueprint.co.uk, linux-kernel@...r.kernel.org,
        ard.biesheuvel@...aro.org, tglx@...utronix.de, jgross@...e.com,
        mingo@...nel.org, torvalds@...ux-foundation.org, hpa@...or.com,
        peterz@...radead.org
Subject: [tip:efi/urgent] efi: Don't issue error message when booted under
 Xen

Commit-ID:  1ea34adb87c969b89dfd83f1905a79161e9ada26
Gitweb:     http://git.kernel.org/tip/1ea34adb87c969b89dfd83f1905a79161e9ada26
Author:     Juergen Gross <jgross@...e.com>
AuthorDate: Fri, 26 May 2017 12:36:47 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 28 May 2017 11:06:16 +0200

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>
Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
Cc: <stable@...r.kernel.org> # v4.9+
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-efi@...r.kernel.org
Link: http://lkml.kernel.org/r/20170526113652.21339-2-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 2661599..e0cf95a 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) {