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minor updates to make it more explicit that when using fpu_kern_thread,

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you don't need to use fpu_kern_enter/_leave...

Reviewed by:	kib
This commit is contained in:
jmg 2014-10-23 17:24:50 +00:00
parent b26a2106d9
commit 5c564e2945
1 changed files with 10 additions and 5 deletions
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15
share/man/man9/fpu_kern.9
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@ -23,7 +23,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd June 23, 2014
.Dd October 23, 2014
.Dt FPU_KERN 9
.Os
.Sh NAME
@ -157,12 +157,17 @@ There are no errors defined for the function, it always returns 0.
.Pp
The
.Fn fpu_kern_thread
function provides an optimization for threads which never leave to
function enables an optimization for threads which never leave to
the usermode.
Such thread can reuse the usermode save area for the FPU state,
which is allowed by the function call.
There is no flags defined for the function, and no error states
The current thread will reuse the usermode save area for the kernel FPU state
instead of requiring an explicitly allocated context.
There are no flags defined for the function, and no error states
that the function returns.
Once this function has been called, neither
.Fn fpu_kern_enter
nor
.Fn fpu_kern_leave
is required to be called and the fpu is available for use in the calling thread.
.Pp
The
.Fn is_fpu_kern_thread