linux-kernel - Re: [PATCH] drm/i915: Minimize uaccess exposure in i915_gem_execbuffer2

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Message-ID: <20200228180441.GL18400@hirez.programming.kicks-ass.net>
Date:   Fri, 28 Feb 2020 19:04:41 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        linux-kernel@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        intel-gfx@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: Minimize uaccess exposure in
 i915_gem_execbuffer2_ioctl()

On Thu, Feb 27, 2020 at 07:03:42PM -0600, Josh Poimboeuf wrote:
> > And why not mark gen8_canonical_addr() __always_inline?
> 
> Right, marking those two functions as __always_inline is the other
> option.  The problem is, if you keep doing it, eventually you end up
> with __always_inline-itis spreading all over the place.  And it affects
> all the other callers, at least in the CONFIG_CC_OPTIMIZE_FOR_SIZE case.
> At least this fix is localized.

I'm all for __always_inline in this case, the compiler not inlining sign
extention is just retarded,