linux-kernel - [PATCH AUTOSEL for 4.14 082/110] x86/efi: Fix kernel param add_efi

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Message-ID: <20180203180015.29073-82-alexander.levin@microsoft.com>
Date:   Sat, 3 Feb 2018 18:01:21 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Dave Young <dyoung@...hat.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Bryan O'Donoghue <pure.logic@...us-software.ie>,
        Ge Song <ge.song@...-semitech.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 082/110] x86/efi: Fix kernel param
 add_efi_memmap regression

From: Dave Young <dyoung@...hat.com>

[ Upstream commit 835bcec5fdf3f9e880111b482177e7e70e3596da ]

'add_efi_memmap' is an early param, but do_add_efi_memmap() has no
chance to run because the code path is before parse_early_param().
I believe it worked when the param was introduced but probably later
some other changes caused the wrong order and nobody noticed it.

Move efi_memblock_x86_reserve_range() after parse_early_param()
to fix it.

Signed-off-by: Dave Young <dyoung@...hat.com>
Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Bryan O'Donoghue <pure.logic@...us-software.ie>
Cc: Ge Song <ge.song@...-semitech.com>
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/20180102172110.17018-2-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 arch/x86/kernel/setup.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index e84cb4c75cd0..c54361a22f59 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -928,9 +928,6 @@ void __init setup_arch(char **cmdline_p)
 		set_bit(EFI_BOOT, &efi.flags);
 		set_bit(EFI_64BIT, &efi.flags);
 	}
-
-	if (efi_enabled(EFI_BOOT))
-		efi_memblock_x86_reserve_range();
 #endif
 
 	x86_init.oem.arch_setup();
@@ -984,6 +981,8 @@ void __init setup_arch(char **cmdline_p)
 
 	parse_early_param();
 
+	if (efi_enabled(EFI_BOOT))
+		efi_memblock_x86_reserve_range();
 #ifdef CONFIG_MEMORY_HOTPLUG
 	/*
 	 * Memory used by the kernel cannot be hot-removed because Linux
-- 
2.11.0