linux-kernel - [PATCH v2 1/5] x86/boot: Run reserve_bios_regions() after we initialize the memory map

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Date:	Wed, 10 Aug 2016 02:29:13 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:	Mario Limonciello <mario_limonciello@...l.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Borislav Petkov <bp@...en8.de>,
	Matt Fleming <mfleming@...e.de>, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH v2 1/5] x86/boot: Run reserve_bios_regions() after we initialize the memory map

reserve_bios_regions() is a quirk that reserves memory that we might
otherwise think is available.  There's no need to run it so early,
and running it before we have the memory map initialized with its
non-quirky inputs makes it hard to make reserve_bios_regions() more
intelligent.

Move it right after we populate the memblock state.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
 arch/x86/kernel/head32.c | 2 --
 arch/x86/kernel/head64.c | 1 -
 arch/x86/kernel/setup.c  | 2 ++
 3 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index 2dda0bc4576e..f16c55bfc090 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -25,8 +25,6 @@ static void __init i386_default_early_setup(void)
 	/* Initialize 32bit specific setup functions */
 	x86_init.resources.reserve_resources = i386_reserve_resources;
 	x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
-
-	reserve_bios_regions();
 }
 
 asmlinkage __visible void __init i386_start_kernel(void)
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 99d48e7d2974..54a2372f5dbb 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -183,7 +183,6 @@ void __init x86_64_start_reservations(char *real_mode_data)
 		copy_bootdata(__va(real_mode_data));
 
 	x86_early_init_platform_quirks();
-	reserve_bios_regions();
 
 	switch (boot_params.hdr.hardware_subarch) {
 	case X86_SUBARCH_INTEL_MID:
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 991b77986d57..082ec5171ddc 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1097,6 +1097,8 @@ void __init setup_arch(char **cmdline_p)
 		efi_find_mirror();
 	}
 
+	reserve_bios_regions();
+
 	/*
 	 * The EFI specification says that boot service code won't be called
 	 * after ExitBootServices(). This is, in fact, a lie.
-- 
2.7.4