linux-kernel - [tip:x86/urgent] Revert "x86: cap iomem_resource to addressable physical memory"

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Message-ID: <tip-ff8a4bae459a9b6455504127fcb78fdbc8e50e4c@git.kernel.org>
Date:	Sun, 28 Jun 2009 07:39:55 GMT
From:	"tip-bot for H. Peter Anvin" <hpa@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	grundler@...isc-linux.org, linux-kernel@...r.kernel.org,
	hpa@...or.com, mingo@...hat.com, mikpe@...uu.se, tglx@...utronix.de
Subject: [tip:x86/urgent] Revert "x86: cap iomem_resource to addressable physical memory"

Commit-ID:  ff8a4bae459a9b6455504127fcb78fdbc8e50e4c
Gitweb:     http://git.kernel.org/tip/ff8a4bae459a9b6455504127fcb78fdbc8e50e4c
Author:     H. Peter Anvin <hpa@...or.com>
AuthorDate: Sat, 27 Jun 2009 12:22:27 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 28 Jun 2009 09:38:47 +0200

Revert "x86: cap iomem_resource to addressable physical memory"

This reverts commit 95ee14e4379c5e19c0897c872350570402014742.
Mikael Petterson <mikepe@...uu.se> reported that at least one of his
systems will not boot as a result.  We have ruled out the detection
algorithm malfunctioning, so it is not a matter of producing the
incorrect bitmasks; rather, something in the application of them
fails.

Revert the commit until we can root cause and correct this problem.

-stable team: this means the underlying commit should be rejected.

Reported-and-isolated-by: Mikael Petterson <mikpe@...uu.se>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
LKML-Reference: <200906261559.n5QFxJH8027336@...spetsen.it.uu.se>
Cc: stable@...nel.org
Cc: Grant Grundler <grundler@...isc-linux.org>


---
 arch/x86/kernel/cpu/common.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 6b26d4d..f1961c0 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -848,9 +848,6 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
 	numa_add_cpu(smp_processor_id());
 #endif
-
-	/* Cap the iomem address space to what is addressable on all CPUs */
-	iomem_resource.end &= (1ULL << c->x86_phys_bits) - 1;
 }
 
 #ifdef CONFIG_X86_64
--
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