Author: cem
Date: Wed Mar  7 18:31:31 2018
New Revision: 330619

  fpu_kern.9: Document fpu_kern_enter API change in r329878
  While here, clean up some of the language.
  Reported by:  delphij
  Sponsored by: Dell EMC Isilon


Modified: head/share/man/man9/fpu_kern.9
--- head/share/man/man9/fpu_kern.9      Wed Mar  7 18:31:01 2018        
+++ head/share/man/man9/fpu_kern.9      Wed Mar  7 18:31:31 2018        
@@ -23,7 +23,7 @@
 .\" $FreeBSD$
-.Dd October 20, 2016
+.Dd March 7, 2018
@@ -34,7 +34,7 @@
 .Fn fpu_kern_alloc_ctx "u_int flags"
 .Ft void
 .Fn fpu_kern_free_ctx "struct fpu_kern_ctx *ctx"
-.Ft int
+.Ft void
 .Fn fpu_kern_enter "struct thread *td" "struct fpu_kern_ctx *ctx" "u_int flags"
 .Ft int
 .Fn fpu_kern_leave "struct thread *td" "struct fpu_kern_ctx *ctx"
@@ -139,19 +139,15 @@ after the function returns, as well as after each cont
 On i386 and amd64 this will be the
 .Nm Device Not Available
 exception (see Intel Software Developer Manual for the reference).
-Currently, no errors are defined which can be returned by
-.Fn fpu_kern_enter
-to the caller.
 .Fn fpu_kern_leave
 function ends the region started by
 .Fn fpu_kern_enter .
-The uses of FPU in the kernel after the call to
-.Fn fpu_kern_leave
-are erroneous until the next call to
+It is erroneous to use the FPU in the kernel before
 .Fn fpu_kern_enter
-is performed.
+or after
+.Fn fpu_kern_leave .
 The function takes the
 .Fa td
 thread argument, which currently must be
@@ -161,9 +157,9 @@ and the
 context pointer, previously passed to
 .Fn fpu_kern_enter .
 After the function returns, the context may be freed or reused
-by other invocation of
+by another invocation of
 .Fn fpu_kern_enter .
-There are no errors defined for the function, it always returns 0.
+The function always returns 0.
 .Fn fpu_kern_thread
@@ -210,3 +206,9 @@ facitily and this manual page were written by
 .An Konstantin Belousov Aq Mt .
 The arm64 support was added by
 .An Andrew Turner Aq Mt .
+.Fn fpu_kern_leave
+should probably have type
+.Ft void
+.Fn fpu_kern_enter ) .
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