Re: [patches] [PATCH] [13/50] x86: Fix and reenable CLFLUSH support inchange_page_attr() | KernelTrap

Re: [patches] [PATCH] [13/50] x86: Fix and reenable CLFLUSH support inchange_page_attr()

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From: Jan Beulich <jbeulich@...>

To: Andi Kleen <ak@...>

Cc: <linux-kernel@...>, <patches@...>

Subject: Re: [patches] [PATCH] [13/50] x86: Fix and reenable CLFLUSH support inchange_page_attr()

Date: Monday, September 24, 2007 - 4:23 am

>@@ -162,7 +198,7 @@ __change_page_attr(unsigned long address
quoted text> 	/* on x86-64 the direct mapping set at boot is not using 4k pages */
>  	BUG_ON(PageReserved(kpte_page));
> 
>-	save_page(kpte_page);
>+	save_page(kpte_page, 0);
> 	if (page_private(kpte_page) == 0)
> 		revert_page(address, ref_prot);
> 	return 0;

What is the point of continuing to launder kpte_page here? Page table pages
never get their caching attributes changed, nor would their direct mapping
ever change. (Same for i386, obviously.)

Jan

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Messages in current thread:

[PATCH] [0/50] x86 2.6.24 patches review II, Andi Kleen, (Fri Sep 21, 6:31 pm)

[PATCH] [49/50] x86_64: Initialize 64bit registers for a.out..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [50/50] x86_64: Remove fpu io port resource, Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Jeff Garzik, (Fri Sep 21, 7:00 pm)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Andi Kleen, (Mon Oct 1, 6:40 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Jeff Garzik, (Mon Oct 1, 7:30 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Alan Cox, (Tue Oct 2, 10:37 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Andi Kleen, (Mon Oct 1, 7:48 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Jeff Garzik, (Mon Oct 1, 9:33 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Mark Lord, (Mon Oct 1, 10:16 am)

[PATCH] [48/50] x86_64: return correct error code from child..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [46/50] x86: also show non-zero IRQ counts for vecto..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [47/50] i386: avoid temporarily inconsistent pte-s, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [45/50] x86_64: configure HPET_EMULATE_RTC automatic..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [44/50] i386: Introduce "used_vectors" bitmap which ..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [43/50] x86: multi-byte single instruction NOPs, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [42/50] i386: constify wd_ops, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [41/50] i386: fix section mismatch warning in intel.c, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [40/50] i386: Fix section mismatch, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP_PRE..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP..., Thomas Gleixner, (Sat Sep 22, 3:33 pm)

Re: [PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP..., Akinobu Mita, (Sat Sep 22, 9:52 pm)

Re: [PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP..., Thomas Gleixner, (Sun Sep 23, 3:52 am)

[PATCH] [39/50] i386: fix 4 bit apicid assumption of mach-de..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [38/50] x86_64: fix off-by-one in find_next_zero_str..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [36/50] x86: Use raw locks during oopses, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [37/50] x86_64: Clean up mce= argument parsing sligh..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [34/50] i386: Fix argument signedness warnings, Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [34/50] i386: Fix argument signedness warnings, Satyam Sharma, (Sat Sep 22, 1:06 am)

Re: [PATCH] [34/50] i386: Fix argument signedness warnings, Jan Engelhardt, (Sat Sep 22, 6:01 am)

Re: [PATCH] [34/50] i386: Fix argument signedness warnings, Randy Dunlap, (Sat Sep 22, 1:42 pm)

[PATCH] [33/50] x86: rename .i assembler includes to .h, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [32/50] x86: Show last exception from/to register c..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [31/50] x86_64: honor notify_die() returning NOTIFY_..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [31/50] x86_64: honor notify_die() returning NOT..., Thomas Gleixner, (Sat Sep 22, 3:23 pm)

[PATCH] [30/50] x86_64: remove some dead code, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [29/50] x86: honor _PAGE_PSE bit on page walks, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [28/50] i386: remove stub early_printk.c, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [27/50] x86_64: Remove duplicated vsyscall nsec update, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [26/50] i386: export i386 smp_call_function_mask() t..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [23/50] x86_64: Implement missing x86_64 function sm..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [25/50] x86_64: Add parenthesis to IRQ vector macros, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [24/50] x86_64: Eliminate result signage problem in ..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [22/50] i386: Misc cpuinit annotations, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [18/50] x86_64: Save registers in saved_context duri..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [21/50] i386: Misc cpuinit annotations, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [13/50] x86: Fix and reenable CLFLUSH support in cha..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [patches] [PATCH] [13/50] x86: Fix and reenable CLFLUSH ..., Jan Beulich, (Mon Sep 24, 4:23 am)

Re: [patches] [PATCH] [13/50] x86: Fix and reenable CLFLUSH ..., Andi Kleen, (Mon Oct 1, 6:38 am)

Re: [PATCH] [13/50] x86: Fix and reenable CLFLUSH support in..., Oleg Verych, (Sat Sep 22, 1:47 am)

Re: [PATCH] [13/50] x86: Fix and reenable CLFLUSH support in..., Andi Kleen, (Mon Oct 1, 6:59 am)

[PATCH] [20/50] x86_64: Fix some broken white space in arch/..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [20/50] x86_64: Fix some broken white space in a..., Thomas Gleixner, (Sat Sep 22, 3:17 pm)

Re: [PATCH] [20/50] x86_64: Fix some broken white space in a..., Oleg Verych, (Sat Sep 22, 9:47 pm)

[PATCH] [16/50] x86: Use macros to modify the PG_arch_1 page..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [19/50] Experimental: detect if SVM is disabled by B..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Thomas Gleixner, (Sat Sep 22, 3:05 pm)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Joerg Roedel, (Sat Sep 22, 5:17 am)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Andi Kleen, (Mon Oct 1, 12:47 pm)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Joerg Roedel, (Mon Oct 1, 4:12 pm)

Re: [patches] [PATCH] [19/50] Experimental: detect if SVM is..., Andi Kleen, (Mon Oct 1, 5:45 pm)

Re: [patches] [PATCH] [19/50] Experimental: detect if SVM is..., Joerg Roedel, (Mon Oct 1, 6:13 pm)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Sam Ravnborg, (Sat Sep 22, 2:59 am)

[PATCH] [17/50] x86_64: remove STR() macros, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [11/50] x86_64: Install unstripped copy of 64bit vds..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [14/50] x86: Minor code-style cleanups to change_pag..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [15/50] x86_64: Return EINVAL for unknown address in..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [patches] [PATCH] [15/50] x86_64: Return EINVAL for unkn..., Jan Beulich, (Mon Sep 24, 4:32 am)

[PATCH] [12/50] x86_64: Untable __init references between IO..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [patches] [PATCH] [12/50] x86_64: Untable __init referen..., Yinghai Lu, (Sat Sep 22, 1:37 am)

[PATCH] [7/50] x86: expand /proc/interrupts to include missi..., Andi Kleen, (Fri Sep 21, 6:32 pm)

possible corrections in the docs (Re: [PATCH] [7/50] x86: ex..., Oleg Verych, (Fri Sep 21, 11:35 pm)

Re: possible corrections in the docs (Re: [PATCH] [7/50] x86..., Joe Korty, (Fri Sep 21, 11:52 pm)

[PATCH] [9/50] i386: validate against ACPI motherboard resou..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 2:49 am)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Robert Hancock, (Sat Sep 22, 12:28 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 4:47 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Thomas Gleixner, (Sat Sep 22, 2:01 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Robert Hancock, (Sat Sep 22, 2:42 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 4:40 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Robert Hancock, (Sat Sep 22, 5:27 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 9:34 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 9:20 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., H. Peter Anvin, (Sat Sep 22, 4:56 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 2:56 am)

[PATCH] [10/50] x86_64: install unstripped copies of compat ..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [6/50] i386: clean up oops/bug reports, Andi Kleen, (Fri Sep 21, 6:32 pm)

Killing printk calls for size (Re: [PATCH] [6/50] i386: clea..., Oleg Verych, (Fri Sep 21, 10:51 pm)

Re: [PATCH] [6/50] i386: clean up oops/bug reports, Chuck Ebbert, (Fri Sep 21, 6:41 pm)

Re: [PATCH] [6/50] i386: clean up oops/bug reports, Jan Engelhardt, (Sat Sep 22, 5:47 am)

[PATCH] [8/50] x86_64: remove x86_cpu_to_log_apicid, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [5/50] i386: change order in Kconfig.cpu, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Thomas Gleixner, (Sat Sep 22, 1:50 pm)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Andi Kleen, (Mon Oct 1, 7:17 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Dave Jones, (Fri Sep 21, 6:45 pm)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Andi Kleen, (Sun Sep 30, 6:09 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Sam Ravnborg, (Sat Sep 22, 2:57 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Dave Jones, (Sat Sep 22, 10:23 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Randy Dunlap, (Sat Sep 22, 1:40 pm)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Jan Engelhardt, (Sat Sep 22, 5:46 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Alan Cox, (Fri Sep 21, 7:52 pm)

[PATCH] [3/50] x86_64: remove never used apic_mapped, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [2/50] x86_64: use core id bits for apicid_to_node i..., Andi Kleen, (Fri Sep 21, 6:31 pm)

[PATCH] [1/50] x86_64: store core id bits in cpuinfo_x8, Andi Kleen, (Fri Sep 21, 6:31 pm)

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