linux-kernel - Re: [Xen-devel] 2.6.27 - SMP enabled, but only 1 CPU

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Date:	Thu, 06 Nov 2008 13:48:24 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Ian Campbell <Ian.Campbell@...rix.com>,
	"Christopher S. Aker" <caker@...shore.net>,
	xen devel <xen-devel@...ts.xensource.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] 2.6.27 - SMP enabled, but only 1 CPU

Ingo Molnar wrote:
> where exactly is that use? My grep didnt show any users of pud_page(). 
> pud_page() was changed in an incompatible way, all users of it must be 
> updated.
>   

pgd_page() uses it in pgtable-nopud.h, so any users of pgd_page() also 
need to be looked at.  It so happens the only user is 
arch/x86/xen/mmu.c, which expects it to return the vaddr.  Fixed below.

    J

Subject: xen: fix use of pgd_page now that it really does return a page

On 32-bit PAE, pud_page, for no good reason, didn't really return a
struct page *.  Since Jan Beulich's fix "i386/PAE: fix pud_page()",
pud_page does return a struct page *.

Because PAE has 3 pagetable levels, the pud level is folded into the
pgd level, so pgd_page() is the same as pud_page(), and now returns
a struct page *.  Update the xen/mmu.c code which uses pgd_page()
accordingly.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/mmu.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

===================================================================
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -877,7 +877,7 @@
 #else /* CONFIG_X86_32 */
 #ifdef CONFIG_X86_PAE
 	/* Need to make sure unshared kernel PMD is pinnable */
-	xen_pin_page(mm, virt_to_page(pgd_page(pgd[pgd_index(TASK_SIZE)])),
+	xen_pin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
 		     PT_PMD);
 #endif
 	xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));
@@ -994,7 +994,7 @@
 
 #ifdef CONFIG_X86_PAE
 	/* Need to make sure unshared kernel PMD is unpinned */
-	xen_unpin_page(mm, virt_to_page(pgd_page(pgd[pgd_index(TASK_SIZE)])),
+	xen_unpin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
 		       PT_PMD);
 #endif
 


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