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exec.c: add a check between constants to see whether we could skip

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The maximum level is defined as P_L2_LEVELS and skip is defined with 6
bits, which means if P_L2_LEVELS < (1 << 6), skip never exceeds the
boundary.

Since this check is between two constants, which leverages compiler
to optimize the code based on different configuration.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190321082555.21118-7-richardw.yang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wei Yang 2019-03-21 16:25:55 +08:00 • committed by Paolo Bonzini
parent 26ca2075ba
commit 526ca2360e
1 changed files with 2 additions and 1 deletions
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3
exec.c
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@ -324,7 +324,8 @@ static void phys_page_compact(PhysPageEntry *lp, Node *nodes)
assert(valid_ptr < P_L2_SIZE); assert(valid_ptr < P_L2_SIZE);
/* Don't compress if it won't fit in the # of bits we have. */ /* Don't compress if it won't fit in the # of bits we have. */
if (lp->skip + p[valid_ptr].skip >= (1 << 6)) { if (P_L2_LEVELS >= (1 << 6) &&
lp->skip + p[valid_ptr].skip >= (1 << 6)) {
return; return;
} }