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xen/p2m: Collapse early_alloc_p2m_middle redundant checks. 

At the start of the function we were checking for idx != 0
and bailing out. And later calling extend_brk if idx != 0.

That is unnecessary so remove that checks.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-03-30 14:16:49 -04:00
parent cef4cca551
commit d5096850b4
1 changed files with 12 additions and 13 deletions
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25
arch/x86/xen/p2m.c
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@ -502,6 +502,8 @@ static bool alloc_p2m(unsigned long pfn)
static bool __init early_alloc_p2m_middle(unsigned long pfn, bool check_boundary)
{
unsigned topidx, mididx, idx;
unsigned long *p2m;
unsigned long *mid_mfn_p;
topidx = p2m_top_index(pfn);
mididx = p2m_mid_index(pfn);
@ -522,24 +524,21 @@ static bool __init early_alloc_p2m_middle(unsigned long pfn, bool check_boundary
return false;
/* Boundary cross-over for the edges: */
if (idx) {
unsigned long *p2m = extend_brk(PAGE_SIZE, PAGE_SIZE);
unsigned long *mid_mfn_p;
p2m = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_init(p2m);
p2m_init(p2m);
p2m_top[topidx][mididx] = p2m;
p2m_top[topidx][mididx] = p2m;
/* For save/restore we need to MFN of the P2M saved */
/* For save/restore we need to MFN of the P2M saved */
mid_mfn_p = p2m_top_mfn_p[topidx];
WARN(mid_mfn_p[mididx] != virt_to_mfn(p2m_missing),
"P2M_TOP_P[%d][%d] != MFN of p2m_missing!\n",
topidx, mididx);
mid_mfn_p[mididx] = virt_to_mfn(p2m);
mid_mfn_p = p2m_top_mfn_p[topidx];
WARN(mid_mfn_p[mididx] != virt_to_mfn(p2m_missing),
"P2M_TOP_P[%d][%d] != MFN of p2m_missing!\n",
topidx, mididx);
mid_mfn_p[mididx] = virt_to_mfn(p2m);
}
return idx != 0;
return true;
}
static bool __init early_alloc_p2m(unsigned long pfn)