linux-kernel - [PATCH] x86: devicetree: fix config option around x86_flattree_get

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Date:   Fri,  2 Mar 2018 20:12:26 -0800
From:   frowand.list@...il.com
To:     Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ivan Gorinov <ivan.gorinov@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        geert@...ux-m68k.org, laurent.pinchart+renesas@...asonboard.com
Subject: [PATCH] x86: devicetree: fix config option around x86_flattree_get_config()

From: Frank Rowand <frank.rowand@...y.com>

x86_flattree_get_config() is incorrectly protected by
ifdef CONFIG_OF_FLATTREE.  It uses of_get_flat_dt_size(), which
only exists if CONFIG_OF_EARLY_FLATTREE.  This issue has not
been exposed previously because OF_FLATTREE did not occur unless
it was selected by OF_EARLY_FLATTREE.  A devicetree overlay change
is selecting OF_FLATTREE directly instead of indirectly enabling
it by selecting OF_EARLY_FLATTREE.

This problem was exposed by a randconfig generated by the kbuild
test robot, where Platform OLPC was enabled.  OLPC selects
OF_PROMTREE instead of OF_EARLY_FLATREE.  The only other x86
platform that selects OF is X86_INTEL_CE, which does select
OF_EARLY_FLATTREE.

Signed-off-by: Frank Rowand <frank.rowand@...y.com>
---

The devicetree overlay change is in patch 1/4 of the series:
https://lkml.org/lkml/2018/3/2/979

The pull request for the patch series that triggered the kbuild
test robot is:
https://lkml.org/lkml/2018/3/2/1065

 arch/x86/kernel/devicetree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 25de5f6ca997..45416826f6ee 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -259,7 +259,7 @@ static void __init dtb_apic_setup(void)
 	dtb_ioapic_setup();
 }

-#ifdef CONFIG_OF_FLATTREE
+#ifdef CONFIG_OF_EARLY_FLATTREE
 static void __init x86_flattree_get_config(void)
 {
 	u32 size, map_len;
-- 
Frank Rowand <frank.rowand@...y.com>