From: Christoph Hellwig <hch@lst•de>
To: Rob Clark <robdclark@chromium•org>
Cc: Mark Rutland <mark.rutland@arm•com>,
Maxime Ripard <maxime.ripard@bootlin•com>,
Catalin Marinas <catalin.marinas@arm•com>,
David Airlie <airlied@linux•ie>,
Maarten Lankhorst <maarten.lankhorst@linux•intel.com>,
LKML <linux-kernel@vger•kernel.org>,
dri-devel <dri-devel@lists•freedesktop.org>,
Sean Paul <sean@poorly•run>, Rob Clark <robdclark@gmail•com>,
linux-arm-kernel@lists•infradead.org,
Daniel Vetter <daniel@ffwll•ch>,
Greg Kroah-Hartman <gregkh@linuxfoundation•org>,
Thomas Gleixner <tglx@linutronix•de>,
Will Deacon <will@kernel•org>, Christoph Hellwig <hch@lst•de>,
Allison Randal <allison@lohutok•net>
Subject: Re: [PATCH 1/2] drm: add cache support for arm64
Date: Thu, 8 Aug 2019 09:59:47 +0200 [thread overview]
Message-ID: <20190808075947.GE30308@lst.de> (raw)
In-Reply-To: <CAJs_Fx71T=kJEgt28TWqzw+jOahSbLQynCg83+szQW7op4xBkQ@mail.gmail.com>
On Wed, Aug 07, 2019 at 10:30:04AM -0700, Rob Clark wrote:
> So, we do end up using GFP_HIGHUSER, which appears to get passed thru
> when shmem gets to the point of actually allocating pages.. not sure
> if that just ends up being a hint, or if it guarantees that we don't
> get something in the linear map.
>
> (Bear with me while I "page" this all back in.. last time I dug thru
> the shmem code was probably pre-armv8, or at least before I had any
> armv8 hw)
GFP_HIGHUSER basically just means that this is an allocation that could
dip into highmem, in which case it would not have a kernel mapping.
This can happen on arm + LPAE, but not on arm64.
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next prev parent reply other threads:[~2019-08-08 8:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-05 21:14 [PATCH 1/2] drm: add cache support for arm64 Rob Clark
2019-08-06 8:48 ` Christoph Hellwig
2019-08-06 9:38 ` Daniel Vetter
2019-08-06 11:38 ` Christoph Hellwig
2019-08-06 14:11 ` Rob Clark
2019-08-06 14:34 ` Mark Rutland
2019-08-06 16:31 ` Rob Clark
2019-08-07 12:38 ` Mark Rutland
2019-08-07 16:15 ` Rob Clark
2019-08-07 16:49 ` Mark Rutland
2019-08-07 17:30 ` Rob Clark
2019-08-08 7:59 ` Christoph Hellwig [this message]
2019-08-08 16:44 ` Rob Clark
2019-08-09 8:18 ` Christoph Hellwig
2019-08-08 7:58 ` Christoph Hellwig
2019-08-08 10:20 ` Mark Rutland
2019-08-08 10:24 ` Mark Rutland
2019-08-08 10:32 ` Will Deacon
2019-08-08 7:53 ` Christoph Hellwig
2019-08-06 15:50 ` Christoph Hellwig
2019-08-06 16:23 ` Rob Clark
2019-08-06 16:26 ` Rob Clark
2019-08-07 6:25 ` Christoph Hellwig
2019-08-07 8:48 ` Daniel Vetter
2019-08-08 9:55 ` Christoph Hellwig
2019-08-08 11:58 ` Daniel Vetter
2019-08-09 8:14 ` Christoph Hellwig
2019-08-07 16:09 ` Rob Clark
2019-08-08 10:00 ` Christoph Hellwig
2019-08-08 16:32 ` Rob Clark
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