linux-kernel - Re: linux-next: Tree for Sep 18 (objtool)

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Message-ID: <20190923092024.GI2349@hirez.programming.kicks-ass.net>
Date:   Mon, 23 Sep 2019 11:20:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: linux-next: Tree for Sep 18 (objtool)

On Wed, Sep 18, 2019 at 09:04:21PM -0700, Randy Dunlap wrote:
> On 9/18/19 3:10 PM, Mark Brown wrote:
> > Hi all,
> > 
> > Changes since 20190917:
> > 
> 
> on x86_64:
> 
> drivers/gpu/drm/i915/gem/i915_gem_execbuffer.o: warning: objtool: i915_gem_execbuffer2_ioctl()+0x2fb: call to gen8_canonical_addr() with UACCESS enabled

I'm thinking that comes from:

				offset = gen8_canonical_addr(offset & ~UPDATE);
				if (unlikely(__put_user(offset, &urelocs[r-stack].presumed_offset))) {

however, per commit 6ae865615fc4 (and 2a418cf3f5f1) the compiler really
should not be sticking gen8_canonical_addr() after __uaccess_begin().

/me puzzled...