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

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Date:	Sat, 27 Jun 2009 23:49:09 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	grundler@...isc-linux.org, tglx@...utronix.de, mikpe@...uu.se
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] Revert "x86: cap iomem_resource to addressable physical memory"

tip-bot for H. Peter Anvin writes:
 > Commit-ID:  fc1dbec8ae1a451557ade978bf7777b267690ca9
 > Gitweb:     http://git.kernel.org/tip/fc1dbec8ae1a451557ade978bf7777b267690ca9
 > Author:     H. Peter Anvin <hpa@...or.com>
 > AuthorDate: Sat, 27 Jun 2009 12:22:27 -0700
 > Committer:  H. Peter Anvin <hpa@...or.com>
 > CommitDate: Sat, 27 Jun 2009 12:22:27 -0700
 > 
 > Revert "x86: cap iomem_resource to addressable physical memory"
 > 
 > This reverts commit 95ee14e4379c5e19c0897c872350570402014742.
 > Mikael Petterson <mikpe@...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 <mikepe@...uu.se>

Typo, please s/mikepe/mikpe/ here.

 > 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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