Date: Wed, 06 Jun 2018 09:57:01 -0400 From: Ravi Pokala <rpokala@freebsd.org> To: Benjamin Kaduk <bjkfbsd@gmail.com> Cc: Mateusz Guzik <mjg@freebsd.org>, src-committers <src-committers@freebsd.org>, <svn-src-all@freebsd.org>, <svn-src-head@freebsd.org> Subject: Re: svn commit: r334702 - head/sys/sys Message-ID: <41069956-C0D7-43C6-93D7-A843D991E47B@panasas.com> In-Reply-To: <CAJ5_RoALt_%2BASNN5E2wBch-CEn0sesJO=1Z2aJsz1EwsesdFiQ@mail.gmail.com> References: <201806060508.w56586c9053686@repo.freebsd.org> <6E6E92B2-7536-4281-8EAF-72823E84902E@panasas.com> <CAJ5_RoALt_%2BASNN5E2wBch-CEn0sesJO=1Z2aJsz1EwsesdFiQ@mail.gmail.com>
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-----Original Message----- From: <owner-src-committers@freebsd.org> on behalf of Benjamin Kaduk <bjkfb= sd@gmail.com> Date: 2018-06-06, Wednesday at 07:40 To: Ravi Pokala <rpokala@freebsd.org> Cc: Mateusz Guzik <mjg@freebsd.org>, src-committers <src-committers@freebsd= .org>, <svn-src-all@freebsd.org>, <svn-src-head@freebsd.org> Subject: Re: svn commit: r334702 - head/sys/sys > On Wed, Jun 6, 2018 at 6:35 AM, Ravi Pokala <rpokala@freebsd.org> wrote: >>=20 >> Hi Mateusz, >>=20 >> =EF=BB=BF-----Original Message----- >> From: <owner-src-committers@freebsd.org> on behalf of Mateusz Guzik <mjg= @FreeBSD.org> >> Date: 2018-06-06, Wednesday at 01:08 >> To: <src-committers@freebsd.org>, <svn-src-all@freebsd.org>, <svn-src-he= ad@freebsd.org> >> Subject: svn commit: r334702 - head/sys/sys >>=20 >>> ... >>> #ifdef _KERNEL >>> #define malloc(size, type, flags) ({ = \ >>=20 >> Now that I'm taking another look at this, I'm confused as to why the ent= ire macro expansion is inside parentheses? (The braces make sense, since thi= s is a block with local variables which need to be contained.) >=20 > This is a gcc (and clang) extension to allow the macro body to be a code = block -- standard C gets unhappy with just the curly braces. https://gcc.gn= u.org/onlinedocs/gcc/Statement-Exprs.html is a maybe-relevant page that goog= le found me. "Neat." Thanks Ben. -Ravi > -Ben=20
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