Date: Fri, 13 Oct 2017 14:54:27 -0600 From: Ian Lepore <ian@freebsd.org> To: Mateusz Guzik <mjg@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r324609 - head/sys/sys Message-ID: <1507928067.8386.84.camel@freebsd.org> In-Reply-To: <201710132031.v9DKVueS089009@repo.freebsd.org> References: <201710132031.v9DKVueS089009@repo.freebsd.org>
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On Fri, 2017-10-13 at 20:31 +0000, Mateusz Guzik wrote: > Author: mjg > Date: Fri Oct 13 20:31:56 2017 > New Revision: 324609 > URL: https://svnweb.freebsd.org/changeset/base/324609 > > Log: > mtx: change MTX_UNOWNED from 4 to 0 > > The value is spread all over the kernel and zeroing a register is > cheaper/shorter than setting it up to an arbitrary value. > > Reduces amd64 GENERIC-NODEBUG .text size by 0.4%. > > MFC after: 1 week > If you MFC this, won't that break the ABI for modules compiled against earlier versions of the branch? Also, won't this trigger a need to recompile out of tree modules such as video drivers, virtualbox, etc? Does that need an UPDATING entry? -- Ian
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