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Date: Wed, 06 Jun 2018 09:57:01 -0400
Subject: Re: svn commit: r334702 - head/sys/sys
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>
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Thread-Topic: svn commit: r334702 - head/sys/sys
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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