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linuxkpi: Add __copy_to_user_inatomic and __copy_from_user_inatomic

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Reviewed by:	bz
Obtained from:	drm-kmod
Sponsored by:	Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D36113
This commit is contained in:
Emmanuel Vadot 2022-08-10 08:44:14 +02:00
parent bf27839aa9
commit 76d93395c5
1 changed files with 25 additions and 0 deletions
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25
sys/compat/linuxkpi/common/include/linux/uaccess.h
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@ -89,4 +89,29 @@ pagefault_disabled(void)
return ((curthread->td_pflags & TDP_NOFAULTING) != 0);
}
static inline int
__copy_to_user_inatomic(void __user *to, const void *from, unsigned n)
{
return (copyout_nofault(from, to, n) != 0 ? n : 0);
}
#define __copy_to_user_inatomic_nocache(to, from, n) \
__copy_to_user_inatomic((to), (from), (n))
static inline unsigned long
__copy_from_user_inatomic(void *to, const void __user *from,
unsigned long n)
{
/*
* XXXKIB. Equivalent Linux function is implemented using
* MOVNTI for aligned moves. For unaligned head and tail,
* normal move is performed. As such, it is not incorrect, if
* only somewhat slower, to use normal copyin. All uses
* except shmem_pwrite_fast() have the destination mapped WC.
*/
return ((copyin_nofault(__DECONST(void *, from), to, n) != 0 ? n : 0));
}
#define __copy_from_user_inatomic_nocache(to, from, n) \
__copy_from_user_inatomic((to), (from), (n))
#endif /* _LINUXKPI_LINUX_UACCESS_H_ */