linux-kernel - [tip:x86/boot] x86/e820/32: Fix e820_search

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Message-ID: <tip-c19a5f35e315837170ee337eed21c7087ea94192@git.kernel.org>
Date:   Thu, 12 Jan 2017 02:07:16 -0800
From:   tip-bot for Arnd Bergmann <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, torvalds@...ux-foundation.org, peterz@...radead.org,
        toshi.kani@....com, richard.weiyang@...il.com, mingo@...nel.org,
        dvlasenk@...hat.com, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, arnd@...db.de
Subject: [tip:x86/boot] x86/e820/32: Fix e820_search_gap() error handling on
 x86-32

Commit-ID:  c19a5f35e315837170ee337eed21c7087ea94192
Gitweb:     http://git.kernel.org/tip/c19a5f35e315837170ee337eed21c7087ea94192
Author:     Arnd Bergmann <arnd@...db.de>
AuthorDate: Wed, 11 Jan 2017 15:49:04 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 12 Jan 2017 09:40:06 +0100

x86/e820/32: Fix e820_search_gap() error handling on x86-32

GCC correctly points out that on 32-bit kernels, e820_search_gap()
not finding a start now leads to pci_mem_start ('gapstart') being set to an
uninitialized value:

  arch/x86/kernel/e820.c: In function 'e820_setup_gap':
  arch/x86/kernel/e820.c:641:16: error: 'gapstart' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This restores the behavior from before this cleanup:

  b4ed1d15b453 ("x86/e820: Make e820_search_gap() static and remove unused variables")

... defaulting to address 0x10000000 if nothing was found.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Toshi Kani <toshi.kani@....com>
Cc: Wei Yang <richard.weiyang@...il.com>
Fixes: b4ed1d15b453 ("x86/e820: Make e820_search_gap() static and remove unused variables")
Link: http://lkml.kernel.org/r/20170111144926.695369-1-arnd@arndb.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/e820.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 46f2afd..b2bbad6 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -626,14 +626,16 @@ __init void e820_setup_gap(void)
 	gapsize = 0x400000;
 	found  = e820_search_gap(&gapstart, &gapsize);
 
-#ifdef CONFIG_X86_64
 	if (!found) {
+#ifdef CONFIG_X86_64
 		gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024;
 		printk(KERN_ERR
 	"e820: cannot find a gap in the 32bit address range\n"
 	"e820: PCI devices with unassigned 32bit BARs may break!\n");
-	}
+#else
+		gapstart = 0x10000000;
 #endif
+	}
 
 	/*
 	 * e820_reserve_resources_late protect stolen RAM already