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From: "Tobin C. Harding" <me@tobin.cc>
To: "Valdis Klētnieks" <valdis.kletnieks@vt.edu>
Cc: Igor Pylypiv <igor.pylypiv@gmail.com>,
	Jesse Simpson <jesse.simpson36@gmail.com>,
	kernelnewbies@kernelnewbies.org
Subject: Re: Where is PageHead defined in v5.0?
Date: Fri, 29 Mar 2019 07:56:09 +1100
Message-ID: <20190328205609.GE2964@eros.localdomain> (raw)
In-Reply-To: <28865.1553752247@turing-police>

On Thu, Mar 28, 2019 at 01:50:47AM -0400, Valdis Klētnieks wrote:
> On Wed, 27 Mar 2019 17:23:05 -0700, Igor Pylypiv said:
> > and TESTPAGEFLAG defines PageHead:
> >         #define TESTPAGEFLAG(uname, lname, policy) \
> >         static __always_inline int Page##uname(struct page *page)
> >         (https://elixir.bootlin.com/linux/v5.0.5/source/include/linux/page-flags.h#L215)
> 
> General tip:  If you're trying to find where the kernel defines FooBar,
> and 'git grep FooBar' only finds uses and no definitions, it probably
> means somebody got over-exuberant with the ## pre-processor
> operator
> 
> 'git grep Foo##' usually reveals the culprit. ;)

Awesome tip, thanks Valdis.

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Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-27 22:26 Tobin C. Harding
2019-03-28  0:34 ` Jesse Simpson
2019-03-27 23:49   ` Tobin C. Harding
2019-03-28  0:23     ` Igor Pylypiv
2019-03-28  4:43       ` Tobin C. Harding
2019-03-28  5:50       ` Valdis Klētnieks
2019-03-28 20:49         ` Jesse Simpson
2019-03-28 20:56         ` Tobin C. Harding [this message]

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