Author: hselasky
Date: Thu Mar 16 16:53:22 2017
New Revision: 315420
URL: https://svnweb.freebsd.org/changeset/base/315420
Log:
The LinuxKPI pagefault disable and enable functions can only be used
pairwise to support the FreeBSD way of pushing and popping the page
fault flags. Ensure this by requiring every occurrence of pagefault
disable function call to have a corresponding pagefault enable call.
Obtained from: kmacy @
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/include/linux/uaccess.h
Modified: head/sys/compat/linuxkpi/common/include/linux/uaccess.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/uaccess.h Thu Mar 16
16:49:27 2017 (r315419)
+++ head/sys/compat/linuxkpi/common/include/linux/uaccess.h Thu Mar 16
16:53:22 2017 (r315420)
@@ -67,22 +67,13 @@ extern int linux_copyout(const void *kad
extern size_t linux_clear_user(void *uaddr, size_t len);
extern int linux_access_ok(int rw, const void *uaddr, size_t len);
-/*
- * NOTE: The returned value from pagefault_disable() must be stored
- * and passed to pagefault_enable(). Else possible recursion on the
- * state can be lost.
- */
-static inline int __must_check
-pagefault_disable(void)
-{
- return (vm_fault_disable_pagefaults());
-}
+#define pagefault_disable(void) do { \
+ int __saved_pflags = \
+ vm_fault_disable_pagefaults()
-static inline void
-pagefault_enable(int save)
-{
- vm_fault_enable_pagefaults(save);
-}
+#define pagefault_enable(void) \
+ vm_fault_enable_pagefaults(__saved_pflags); \
+} while (0)
static inline bool
pagefault_disabled(void)
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