linux-kernel - Re: screen rotation flipped in 4.8-rc

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Date:   Wed, 31 Aug 2016 20:29:56 +0000
From:   "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
To:     "mranostay@...il.com" <mranostay@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux@...encehorizons.net" <linux@...encehorizons.net>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "hadess@...ess.net" <hadess@...ess.net>
Subject: Re: screen rotation flipped in 4.8-rc

On Wed, 2016-08-31 at 13:24 -0700, Matt Ranostay wrote:
> On Wed, Aug 31, 2016 at 1:18 PM, Pandruvada, Srinivas
> <srinivas.pandruvada@...el.com> wrote:
> > 
> > On Tue, 2016-08-30 at 17:41 -0700, Matt Ranostay wrote:
> > > 
> > > On Tue, Aug 30, 2016 at 3:42 PM, Pandruvada, Srinivas
> > > <srinivas.pandruvada@...el.com> wrote:
> > > > 
> > > > 
> > > > Hi All,
> > > > 
> > > > I observed that using iio-sensor-proxy.service, the auto screen
> > > > rotation flipped on my laptop (Normal -> vertical, vertical-
> > > > > 
> > > > > normal)
> > > > using kernel v4.8.
> > > > 
> > > > Anyone else has seen this?
> > > > 
> > > > I did a bisect and found a commit, which I am not sure how can
> > > > it
> > > > impact.
> > > Could you post the results of CONFIG_TEST_HASH enabled?
> > Attached dmesg.txt with the CONFIG_TEST_HASH=y.
> > 
> > I see
> > [    4.276138] test_hash: __hash_32() has no arch implementation to
> > test.
> > [    4.276138] test_hash: hash_32() has no arch implementation to
> > test.
> > [    4.276139] test_hash: hash_64() has no arch implementation to
> > test.
> > [    4.276141] test_hash: 33152 tests passed.
> > 
> Ok have you tested with that patchset reverted? And if so does the
> regression disappear?
Yes, but not after adding CONFIG_TEST_HASH=y.
regression disappears.

> I would highly doubt if it was a issue with that dcache patchsets it
> wouldn't be breaking a ton of things.
I also think that.

Thanks,
Srinivas

> 
> > 
> > Thanks,
> > Srinivas
> > > 
> > > 
> > > Thanks,
> > > 
> > > Matt
> > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > commit 703b5faf22fbddf984a361e6555f3a03fdba63d9
> > > > Author: George Spelvin <linux@...encehorizons.net>
> > > > Date:   Fri Jun 10 00:22:12 2016 -0400
> > > > 
> > > >     fs/dcache.c: Save one 32-bit multiply in dcache lookup
> > > > 
> > > >     Noe that we're mixing in the parent pointer earlier, we
> > > >     don't need to use hash_32() to mix its bits.  Instead, we
> > > > can
> > > >     just take the msbits of the hash value directly.
> > > > 
> > > >     For those applications which use the partial_name_hash(),
> > > >     move the multiply to end_name_hash.
> > > > 
> > > >     Signed-off-by: George Spelvin <linux@...encehorizons.net>
> > > >     Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.or
> > > > g>
> > > > 
> > > > 
> > > > Thanks,
> > > > Srinivas