linux-kernel - Re: Bloat caused by unnecessary calls to compound

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Message-ID: <20160327203304.9695.qmail@ns.horizon.com>
Date:	27 Mar 2016 16:33:04 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	ebiggers3@...il.com
Cc:	kirill@...temov.name, linux@...izon.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: Bloat caused by unnecessary calls to compound_head()?

Could you just mark compound_head __pure?  That would tell the compiler
that it's safe to re-use the return value as long as there is no memory
mutation in between.