Date: Thu, 23 Oct 2014 17:24:50 +0000 (UTC) From: John-Mark Gurney <jmg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r273550 - head/share/man/man9 Message-ID: <201410231724.s9NHOoTe053725@svn.freebsd.org>
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Author: jmg Date: Thu Oct 23 17:24:50 2014 New Revision: 273550 URL: https://svnweb.freebsd.org/changeset/base/273550 Log: minor updates to make it more explicit that when using fpu_kern_thread, you don't need to use fpu_kern_enter/_leave... Reviewed by: kib Modified: head/share/man/man9/fpu_kern.9 Modified: head/share/man/man9/fpu_kern.9 ============================================================================== --- head/share/man/man9/fpu_kern.9 Thu Oct 23 15:35:47 2014 (r273549) +++ head/share/man/man9/fpu_kern.9 Thu Oct 23 17:24:50 2014 (r273550) @@ -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 func .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
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