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From: Thomas Gleixner <tglx@linutronix.de>
To: Andi Kleen <ak@suse.de>
Cc: ying.huang@intel.com, mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [8/8] RFC: Fix some EFI problems
Date: Tue, 12 Feb 2008 21:48:45 +0100 (CET)	[thread overview]
Message-ID: <alpine.LFD.1.00.0802122145050.12988@apollo.tec.linutronix.de> (raw)
In-Reply-To: <200802122123.08732.ak@suse.de>

On Tue, 12 Feb 2008, Andi Kleen wrote:

> On Tuesday 12 February 2008 21:04:06 Thomas Gleixner wrote:
> 
> > 
> > And you just copied the real bug in that logic as well:
> > 
> >           set_memory_uc(md->virt_addr, size);
> 
> Oops you're right. I wanted to fix that, but didn't. Ok I'll put up
> my brown paper back tonight when I go out.
>  
> > ------------------------^^^^^^^^
> > 
> > which is initialized a couple of lines down.
> > 
> > 	md->virt_addr = (u64) (unsigned long) va;
> > 
> > The reordering/optimizing needs to be a separate patch.
> 
> What optimizing? It wasn't intended to be an optimization.
> It fixes a bug.

No, it does not. Please go back and read my mail.
 
The code had exactly two bugs:

1) the logic of checking EFI_MEMORY_WB was wrong
2) the uninitialized variable

The fix is:

 arch/x86/kernel/efi.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6/arch/x86/kernel/efi.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/efi.c
+++ linux-2.6/arch/x86/kernel/efi.c
@@ -428,9 +428,6 @@ void __init efi_enter_virtual_mode(void)
 		else
 			va = efi_ioremap(md->phys_addr, size);
 
-		if (md->attribute & EFI_MEMORY_WB)
-			set_memory_uc(md->virt_addr, size);
-
 		md->virt_addr = (u64) (unsigned long) va;
 
 		if (!va) {
@@ -439,6 +436,9 @@ void __init efi_enter_virtual_mode(void)
 			continue;
 		}
 
+		if (!(md->attribute & EFI_MEMORY_WB))
+			set_memory_uc(md->virt_addr, size);
+
 		systab = (u64) (unsigned long) efi_phys.systab;
 		if (md->phys_addr <= systab && systab < end) {
 			systab += md->virt_addr - md->phys_addr;

The reordering of code is completely irrelevant. It can be done, but
in a separate patch.

Thanks,

	tglx

  reply	other threads:[~2008-02-12 20:49 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-11  9:34 [PATCH] [0/8] Various kernel mapping bug fixes Andi Kleen
2008-02-11  9:34 ` [PATCH] [1/8] CPA: Fix gbpages support in try_preserve_lage_page Andi Kleen
2008-02-11  9:45   ` Thomas Gleixner
2008-02-11 10:12     ` Ingo Molnar
2008-02-11 11:01       ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [2/8] CPA: Flush the caches when setting pages not present Andi Kleen
2008-02-11 11:00   ` Ingo Molnar
2008-02-11 12:26     ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [3/8] CPA: Test the correct mapping alias on x86-64 Andi Kleen
2008-02-11 11:49   ` Ingo Molnar
2008-02-11  9:34 ` [PATCH] [4/8] CPA: Fix set_memory_x for ioremap Andi Kleen
2008-02-11 12:27   ` Ingo Molnar
2008-02-11 12:45     ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [5/8] Fix logic error in 64bit memory hotadd Andi Kleen
2008-02-11 12:46   ` Ingo Molnar
2008-02-11 13:05     ` Andi Kleen
2008-02-11 13:33       ` Ingo Molnar
2008-02-11 13:44         ` Andi Kleen
2008-02-12 10:35       ` Yasunori Goto
2008-02-12 11:20         ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [6/8] Account overlapped mappings in end_pfn_map Andi Kleen
2008-02-11 13:08   ` Ingo Molnar
2008-02-11 13:27     ` Andi Kleen
2008-02-11 13:55       ` Ingo Molnar
2008-02-11 14:16       ` Peter Zijlstra
2008-02-11 14:24         ` Andi Kleen
2008-02-11 14:41           ` Sam Ravnborg
2008-02-11 15:12   ` Arjan van de Ven
2008-02-11  9:34 ` [PATCH] [7/8] Implement true end_pfn_mapped for 32bit Andi Kleen
2008-02-12 19:39   ` Thomas Gleixner
2008-02-12 19:49     ` Andi Kleen
2008-02-12 20:25       ` Thomas Gleixner
2008-02-11  9:34 ` [PATCH] [8/8] RFC: Fix some EFI problems Andi Kleen
2008-02-12 20:04   ` Thomas Gleixner
2008-02-12 20:23     ` Andi Kleen
2008-02-12 20:48       ` Thomas Gleixner [this message]
2008-02-13 11:05         ` Andi Kleen

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