ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu

[mirror_ubuntu-bionic-kernel.git] / include / linux / pfn_t.h

diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index 43b1d7648e826260e193cdb0a49cb038e4896958..a03c2642a87c259c23e1157dfaf21d46080eec91 100644 (file)
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -15,8 +15,10 @@
 #define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2))
 #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))
 #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4))
+#define PFN_SPECIAL (1ULL << (BITS_PER_LONG_LONG - 5))
 
 #define PFN_FLAGS_TRACE \
+       { PFN_SPECIAL,  "SPECIAL" }, \
        { PFN_SG_CHAIN, "SG_CHAIN" }, \
        { PFN_SG_LAST,  "SG_LAST" }, \
        { PFN_DEV,      "DEV" }, \
@@ -120,4 +122,15 @@ pud_t pud_mkdevmap(pud_t pud);
 #endif
 #endif /* __HAVE_ARCH_PTE_DEVMAP */
 
+#ifdef __HAVE_ARCH_PTE_SPECIAL
+static inline bool pfn_t_special(pfn_t pfn)
+{
+       return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL;
+}
+#else
+static inline bool pfn_t_special(pfn_t pfn)
+{
+       return false;
+}
+#endif /* __HAVE_ARCH_PTE_SPECIAL */
 #endif /* _LINUX_PFN_T_H_ */