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The returned value from vm_fault_disable_pagefaults() must be stored

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and passed to vm_fault_enable_pagefaults(). Else possible recursion on
the state can be lost.

Sponsored by:	Mellanox Technologies
Suggested by:	kib @
This commit is contained in:
Hans Petter Selasky 2015-10-19 16:03:08 +00:00
parent eb860592bd
commit a4b5fa85df
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=289593
1 changed files with 13 additions and 4 deletions
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17
sys/ofed/include/linux/uaccess.h
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@ -30,17 +30,26 @@
#ifndef _LINUX_UACCESS_H_
#define _LINUX_UACCESS_H_
#include <linux/compiler.h>
#define get_user(_x, _p) -copyin((_p), &(_x), sizeof(*(_p)))
#define put_user(_x, _p) -copyout(&(_x), (_p), sizeof(*(_p)))
static inline void pagefault_disable(void)
/*
* 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)
{
curthread_pflags_set(TDP_NOFAULTING | TDP_RESETSPUR);
return (vm_fault_disable_pagefaults());
}
static inline void pagefault_enable(void)
static inline void
pagefault_enable(int save)
{
curthread_pflags_restore(~(TDP_NOFAULTING | TDP_RESETSPUR));
vm_fault_enable_pagefaults(save);
}
#endif /* _LINUX_UACCESS_H_ */