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Revision 044d4e1a

ID044d4e1aae539bd4214175bd9591b3de7986cf18

Added by Hanweidong almost 11 years ago

xen-mapcache: pass the right size argument to test_bits

Compute the correct size for test_bits().
qemu_get_ram_ptr() and qemu_safe_ram_ptr() will call xen_map_cache()
with size is 0 if the requested address is in the RAM. Then
xen_map_cache() will pass the size 0 to test_bits() for checking if the
corresponding pfn was mapped in cache. But test_bits() will always
return 1 when size is 0 without any bit testing. Actually, for this
case, test_bits should check one bit. So this patch introduced a
__test_bit_size which is greater than 0 and a multiple of XC_PAGE_SIZE,
then test_bits can work correctly with __test_bit_size

XC_PAGE_SHIFT as its size.

Signed-off-by: Zhenguo Wang <>
Signed-off-by: Weidong Han <>
Signed-off-by: Stefano Stabellini <>

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