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xen/p2m: Fix the comment describing the P2M tree. 

It mixed up the p2m_mid_missing with p2m_missing. Also
remove some extra spaces.

Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-06-28 22:12:36 -04:00
parent 28a33cbc24
commit a3118beb6a
1 changed files with 7 additions and 7 deletions
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14
arch/x86/xen/p2m.c
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@ -22,7 +22,7 @@
* *
* P2M_PER_PAGE depends on the architecture, as a mfn is always * P2M_PER_PAGE depends on the architecture, as a mfn is always
* unsigned long (8 bytes on 64-bit, 4 bytes on 32), leading to * unsigned long (8 bytes on 64-bit, 4 bytes on 32), leading to
* 512 and 1024 entries respectively. * 512 and 1024 entries respectively.
* *
* In short, these structures contain the Machine Frame Number (MFN) of the PFN. * In short, these structures contain the Machine Frame Number (MFN) of the PFN.
* *
@ -139,11 +139,11 @@
* / | ~0, ~0, .... | * / | ~0, ~0, .... |
* | \---------------/ * | \---------------/
* | * |
* p2m_missing p2m_missing * p2m_mid_missing p2m_missing
* /------------------\ /------------\ * /-----------------\ /------------\
* | [p2m_mid_missing]+---->| ~0, ~0, ~0 | * | [p2m_missing] +---->| ~0, ~0, ~0 |
* | [p2m_mid_missing]+---->| ..., ~0 | * | [p2m_missing] +---->| ..., ~0 |
* \------------------/ \------------/ * \-----------------/ \------------/
* *
* where ~0 is INVALID_P2M_ENTRY. IDENTITY is (PFN | IDENTITY_BIT) * where ~0 is INVALID_P2M_ENTRY. IDENTITY is (PFN | IDENTITY_BIT)
*/ */
@ -423,7 +423,7 @@ static void free_p2m_page(void *p)
free_page((unsigned long)p); free_page((unsigned long)p);
} }
/* /*
* Fully allocate the p2m structure for a given pfn. We need to check * Fully allocate the p2m structure for a given pfn. We need to check
* that both the top and mid levels are allocated, and make sure the * that both the top and mid levels are allocated, and make sure the
* parallel mfn tree is kept in sync. We may race with other cpus, so * parallel mfn tree is kept in sync. We may race with other cpus, so