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From: Andi Kleen <ak@suse.de>
To: tglx@linutronix.de, mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: [PATCH] [3/8] CPA: Fix some incorrect comments in the debug pagealloc code
Date: Mon, 11 Feb 2008 10:50:18 +0100 (CET)	[thread overview]
Message-ID: <20080211095018.6AF7E1B41CE@basil.firstfloor.org> (raw)
In-Reply-To: <200802111050.372086035@suse.de>


Even with the pool cpa in debug_pagealloc can fail (e.g. consider memory hotplug) 
Also the code does not clear PSE anymore as the comment claims.

Replace wrong comment with correct one.
Signed-off-by: Andi Kleen <ak@suse.de>

---
 arch/x86/mm/pageattr.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

Index: linux/arch/x86/mm/pageattr.c
===================================================================
--- linux.orig/arch/x86/mm/pageattr.c
+++ linux/arch/x86/mm/pageattr.c
@@ -864,10 +864,7 @@ void kernel_map_pages(struct page *page,
 	if (!debug_pagealloc_enabled)
 		return;
 
-	/*
-	 * The return value is ignored - the calls cannot fail,
-	 * large pages are disabled at boot time:
-	 */
+	/* This can fail in theory but then you're out of luck */
 	if (enable)
 		__set_pages_p(page, numpages);
 	else

  parent reply	other threads:[~2008-02-11  9:51 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-11  9:50 [PATCH] [0/8] Misc CPA patchkit Andi Kleen
2008-02-11  9:50 ` [PATCH] [1/8] CPA: Remove my copyright notice Andi Kleen
2008-02-12  0:42   ` Thomas Gleixner
2008-02-11  9:50 ` [PATCH] [2/8] CPA: Remove inline from static_protections Andi Kleen
2008-02-11 14:04   ` Ingo Molnar
2008-02-11  9:50 ` Andi Kleen [this message]
2008-02-11  9:50 ` [PATCH] [4/8] CPA: Ifdef the cpa pool for DEBUG_PAGEALLOC Andi Kleen
2008-02-11  9:50 ` [PATCH] [5/8] CPA: Move pool allocation/free into separate functions Andi Kleen
2008-02-11  9:50 ` [PATCH] [6/8] CPA: Remove BUG_ON for LRU/Compound pages Andi Kleen
2008-02-17 14:07   ` Thomas Gleixner
2008-02-11  9:50 ` [PATCH] [7/8] CPA: Don't flush caches on CPUs that support self-snoop Andi Kleen
2008-02-11 15:04   ` Arjan van de Ven
2008-02-11 15:12     ` Andi Kleen
2008-02-11 15:21       ` Arjan van de Ven
2008-02-11 15:27         ` Andi Kleen
2008-02-11 17:36           ` Siddha, Suresh B
2008-02-11 17:58             ` Andi Kleen
2008-02-11 19:47               ` Siddha, Suresh B
2008-02-11 20:36                 ` Arjan van de Ven
2008-02-12  8:45                   ` Andi Kleen
2008-02-11  9:50 ` [PATCH] [8/8] CPA: Add statistics about state of direct mapping Andi Kleen

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