linux-kernel - [tip:core/efi] Revert "x86/efi: Request desired alignment via the PE/COFF headers"

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Date:	Sun, 9 Aug 2015 03:24:00 -0700
From:	tip-bot for Matt Fleming <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, linn@...com, tglx@...utronix.de,
	peterz@...radead.org, torvalds@...ux-foundation.org,
	mbrown@...systems.co.uk, linux-kernel@...r.kernel.org,
	mingo@...nel.org, matt.fleming@...el.com
Subject: [tip:core/efi] Revert "x86/efi:
  Request desired alignment via the PE/COFF headers"

Commit-ID:  fa5c35011a8d5f3d0c597a6336107eafd1b6046c
Gitweb:     http://git.kernel.org/tip/fa5c35011a8d5f3d0c597a6336107eafd1b6046c
Author:     Matt Fleming <matt.fleming@...el.com>
AuthorDate: Fri, 7 Aug 2015 09:36:56 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 8 Aug 2015 10:37:39 +0200

Revert "x86/efi: Request desired alignment via the PE/COFF headers"

This reverts commit:

  aeffc4928ea2 ("x86/efi: Request desired alignment via the PE/COFF headers")

Linn reports that Signtool complains that kernels built with
CONFIG_EFI_STUB=y are violating the PE/COFF specification because
the 'SizeOfImage' field is not a multiple of 'SectionAlignment'.

This violation was introduced as an optimisation to skip having
the kernel relocate itself during boot and instead have the
firmware place it at a correctly aligned address.

No one else has complained and I'm not aware of any firmware
implementations that refuse to boot with commit aeffc4928ea2,
but it's a real bug, so revert the offending commit.

Reported-by: Linn Crosetto <linn@...com>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michael Brown <mbrown@...systems.co.uk>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1438936621-5215-3-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/boot/header.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 16ef025..7a6d43a 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -154,7 +154,7 @@ extra_header_fields:
 #else
 	.quad	0				# ImageBase
 #endif
-	.long	CONFIG_PHYSICAL_ALIGN		# SectionAlignment
+	.long	0x20				# SectionAlignment
 	.long	0x20				# FileAlignment
 	.word	0				# MajorOperatingSystemVersion
 	.word	0				# MinorOperatingSystemVersion
--
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