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authorArnd Bergmann <arnd@arndb.de>2019-12-12 20:15:25 +0300
committerArnd Bergmann <arnd@arndb.de>2020-01-03 11:32:51 +0300
commit202bf8d7583f2b6e28de2e9edf6fcd7e3667a173 (patch)
treeacc551431ec00ecd6c4935a7d4a2de51c0cae4c6 /include/linux/compat.h
parent556d687a4ccd54ab50a721ddde42c820545effd9 (diff)
downloadlinux-202bf8d7583f2b6e28de2e9edf6fcd7e3667a173.tar.xz
compat: provide compat_ptr() on all architectures
In order to avoid needless #ifdef CONFIG_COMPAT checks, move the compat_ptr() definition to linux/compat.h where it can be seen by any file regardless of the architecture. Only s390 needs a special definition, this can use the self-#define trick we have elsewhere. Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/linux/compat.h')
-rw-r--r--include/linux/compat.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 68f79d855c3d..11083d84eb23 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -958,4 +958,22 @@ static inline bool in_compat_syscall(void) { return false; }
#endif /* CONFIG_COMPAT */
+/*
+ * A pointer passed in from user mode. This should not
+ * be used for syscall parameters, just declare them
+ * as pointers because the syscall entry code will have
+ * appropriately converted them already.
+ */
+#ifndef compat_ptr
+static inline void __user *compat_ptr(compat_uptr_t uptr)
+{
+ return (void __user *)(unsigned long)uptr;
+}
+#endif
+
+static inline compat_uptr_t ptr_to_compat(void __user *uptr)
+{
+ return (u32)(unsigned long)uptr;
+}
+
#endif /* _LINUX_COMPAT_H */