xen/debug: Don't be so verbose with WARN on 1-1 mapping errors.

There are valid situations in which this error is not
a warning. Mainly when QEMU maps a guest memory and uses
the VM_IO flag to set the MFNs. For right now make the
WARN be WARN_ONCE. In the future we will:

 1). Remove the VM_IO code handling..
 2). .. which will also remove this debug facility.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index c82df6c..a991b57 100644 (file)
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -565,13 +565,13 @@ pte_t xen_make_pte_debug(pteval_t pte)
        if (io_page &&
            (xen_initial_domain() || addr >= ISA_END_ADDRESS)) {
                other_addr = pfn_to_mfn(addr >> PAGE_SHIFT) << PAGE_SHIFT;
-               WARN(addr != other_addr,
+               WARN_ONCE(addr != other_addr,
                        "0x%lx is using VM_IO, but it is 0x%lx!\n",
                        (unsigned long)addr, (unsigned long)other_addr);
        } else {
                pteval_t iomap_set = (_pte.pte & PTE_FLAGS_MASK) & _PAGE_IOMAP;
                other_addr = (_pte.pte & PTE_PFN_MASK);
-               WARN((addr == other_addr) && (!io_page) && (!iomap_set),
+               WARN_ONCE((addr == other_addr) && (!io_page) && (!iomap_set),
                        "0x%lx is missing VM_IO (and wasn't fixed)!\n",
                        (unsigned long)addr);
        }