From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50AA815B998 for ; Mon, 16 Feb 2026 13:59:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771250386; cv=none; b=MyGN4QGKgWAKJnOuJmJpvI4k+ysCbeZxMzKoRoqTG4vHqNOe5kkdIlZ357kFJXP9u+AeoHzaJXLKyZZwIlhl34DdbutBZw+xa46gM6BWM72lMDyFGoBpSXU8BOZ+jav/VLwsLK7xAlvTU+NiKfZ2ovA1Cx2ARuq325NTkx4kBqk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771250386; c=relaxed/simple; bh=bTz5hquA2mXPFuRqMqP8HYjYZUd7V6C4n+3/GRvCHyQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=tNkdLmItrNCHSChJzS1QRYcfXyzSmAvVvv1bQ3mTCQK0XLappmx/goGODVGzGY7CkSkS7OMDfnaUYrg+eEjrLBFCXfYjQ2b3pSbQNXYea9A58sSBrjHt/luZ3npaoew1iqvCTTJsQyJpxG3ebfWN7kXUzUh7MI6AJtTIlSuFoNM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=GYv1F0UY; arc=none smtp.client-ip=192.198.163.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="GYv1F0UY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1771250384; x=1802786384; h=message-id:subject:from:to:cc:date:in-reply-to: references:content-transfer-encoding:mime-version; bh=bTz5hquA2mXPFuRqMqP8HYjYZUd7V6C4n+3/GRvCHyQ=; b=GYv1F0UYqnCW4IgMcaX2rZxJKiC4/MV9Tf+cXKmlYOcC6kFyw4JTbpLQ gsPI9AMnttssH2LOSP7Id5JkpUyAlbI9pM02tIz8PyBjOcIH6rhwAE+7p ctS+Q+dqDdbM5DMVscU0ozU5C/4/4MDUKVt5czYiawoPuSsSZy+eomPCO byVEwLe5f5THFM5BiAzmf2VZnC7koNbe4XNR2avrT9zUpVpqxK8eQCiMP jO9fBsL8H1YS54M01ctBVBhhLLhza1KlXhbtdsx6qHSFY5tzS32Jc/QcH W3Ej6yEVH3IXw0jzh5zf7NsXbHx3F7vkua5or4RxUaGLnA70vvt++9ys8 g==; X-CSE-ConnectionGUID: bybe1qWQRK+ESf1BDhdvOQ== X-CSE-MsgGUID: Inf4O/RWQsKhAQVcCDx91w== X-IronPort-AV: E=McAfee;i="6800,10657,11702"; a="59897702" X-IronPort-AV: E=Sophos;i="6.21,294,1763452800"; d="scan'208";a="59897702" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2026 05:59:43 -0800 X-CSE-ConnectionGUID: DzY+0hoLTx6ggL2Jd+6uFA== X-CSE-MsgGUID: anaXl3qERCWZxG8F0N6Q4Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,294,1763452800"; d="scan'208";a="218587977" Received: from pgcooper-mobl3.ger.corp.intel.com (HELO [10.245.244.231]) ([10.245.244.231]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2026 05:59:40 -0800 Message-ID: Subject: Re: [PATCH] [v2] drm/pagemap: pass pagemap_addr by reference From: Thomas =?ISO-8859-1?Q?Hellstr=F6m?= To: Arnd Bergmann , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matthew Brost , Rodrigo Vivi Cc: Arnd Bergmann , Himal Prasad Ghimiray , Lucas De Marchi , Matthew Auld , Francois Dugast , Andrew Morton , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-xe@lists.freedesktop.org Date: Mon, 16 Feb 2026 14:59:37 +0100 In-Reply-To: <20260216134644.1025365-1-arnd@kernel.org> References: <20260216134644.1025365-1-arnd@kernel.org> Organization: Intel Sweden AB, Registration Number: 556189-6027 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-02-16 at 14:46 +0100, Arnd Bergmann wrote: > From: Arnd Bergmann >=20 > Passing a structure by value into a function is sometimes > problematic, > for a number of reasons. Of of these is a warning from the 32-bit arm > compiler: >=20 > drivers/gpu/drm/drm_gpusvm.c: In function '__drm_gpusvm_unmap_pages': > drivers/gpu/drm/drm_gpusvm.c:1152:33: note: parameter passing for > argument of type 'struct drm_pagemap_addr' changed in GCC 9.1 > =C2=A01152 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 dpagemap->ops- > >device_unmap(dpagemap, > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > =C2=A01153 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > dev, *addr); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 > ~~~~~~~~~~~ >=20 > This particular problem is harmless since we are not mixing compiler > versions > inside of the compiler. However, passing this by reference avoids the > warning > along with providing slightly better calling conventions as it avoids > an > extra copy on the stack. >=20 > Signed-off-by: Arnd Bergmann Thanks. Reviewed-by: Thomas Hellstr=C3=B6m Will push to drm-misc-fixes once CI is complete. /Thomas > --- > =C2=A0drivers/gpu/drm/drm_gpusvm.c=C2=A0 | 2 +- > =C2=A0drivers/gpu/drm/drm_pagemap.c | 2 +- > =C2=A0drivers/gpu/drm/xe/xe_svm.c=C2=A0=C2=A0 | 8 ++++---- > =C2=A0include/drm/drm_pagemap.h=C2=A0=C2=A0=C2=A0=C2=A0 | 2 +- > =C2=A04 files changed, 7 insertions(+), 7 deletions(-) >=20 > diff --git a/drivers/gpu/drm/drm_gpusvm.c > b/drivers/gpu/drm/drm_gpusvm.c > index c25f50cad6fe..81626b00b755 100644 > --- a/drivers/gpu/drm/drm_gpusvm.c > +++ b/drivers/gpu/drm/drm_gpusvm.c > @@ -1150,7 +1150,7 @@ static void __drm_gpusvm_unmap_pages(struct > drm_gpusvm *gpusvm, > =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 addr->dir); > =C2=A0 else if (dpagemap && dpagemap->ops- > >device_unmap) > =C2=A0 dpagemap->ops- > >device_unmap(dpagemap, > - =C2=A0=C2=A0=C2=A0 dev, > *addr); > + =C2=A0=C2=A0=C2=A0 dev, > addr); > =C2=A0 i +=3D 1 << addr->order; > =C2=A0 } > =C2=A0 > diff --git a/drivers/gpu/drm/drm_pagemap.c > b/drivers/gpu/drm/drm_pagemap.c > index d0041c947a28..22579806c055 100644 > --- a/drivers/gpu/drm/drm_pagemap.c > +++ b/drivers/gpu/drm/drm_pagemap.c > @@ -318,7 +318,7 @@ static void > drm_pagemap_migrate_unmap_pages(struct device *dev, > =C2=A0 struct drm_pagemap_zdd *zdd =3D page- > >zone_device_data; > =C2=A0 struct drm_pagemap *dpagemap =3D zdd- > >dpagemap; > =C2=A0 > - dpagemap->ops->device_unmap(dpagemap, dev, > pagemap_addr[i]); > + dpagemap->ops->device_unmap(dpagemap, dev, > &pagemap_addr[i]); > =C2=A0 } else { > =C2=A0 dma_unmap_page(dev, pagemap_addr[i].addr, > =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 PAGE_SIZE << > pagemap_addr[i].order, dir); > diff --git a/drivers/gpu/drm/xe/xe_svm.c > b/drivers/gpu/drm/xe/xe_svm.c > index 213f0334518a..78f4b2c60670 100644 > --- a/drivers/gpu/drm/xe/xe_svm.c > +++ b/drivers/gpu/drm/xe/xe_svm.c > @@ -1676,13 +1676,13 @@ xe_drm_pagemap_device_map(struct drm_pagemap > *dpagemap, > =C2=A0 > =C2=A0static void xe_drm_pagemap_device_unmap(struct drm_pagemap > *dpagemap, > =C2=A0 struct device *dev, > - struct drm_pagemap_addr > addr) > + const struct > drm_pagemap_addr *addr) > =C2=A0{ > - if (addr.proto !=3D XE_INTERCONNECT_P2P) > + if (addr->proto !=3D XE_INTERCONNECT_P2P) > =C2=A0 return; > =C2=A0 > - dma_unmap_resource(dev, addr.addr, PAGE_SIZE << addr.order, > - =C2=A0=C2=A0 addr.dir, DMA_ATTR_SKIP_CPU_SYNC); > + dma_unmap_resource(dev, addr->addr, PAGE_SIZE << addr- > >order, > + =C2=A0=C2=A0 addr->dir, DMA_ATTR_SKIP_CPU_SYNC); > =C2=A0} > =C2=A0 > =C2=A0static void xe_pagemap_destroy_work(struct work_struct *work) > diff --git a/include/drm/drm_pagemap.h b/include/drm/drm_pagemap.h > index 2baf0861f78f..c848f578e3da 100644 > --- a/include/drm/drm_pagemap.h > +++ b/include/drm/drm_pagemap.h > @@ -95,7 +95,7 @@ struct drm_pagemap_ops { > =C2=A0 */ > =C2=A0 void (*device_unmap)(struct drm_pagemap *dpagemap, > =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 struct device *dev, > - =C2=A0=C2=A0=C2=A0=C2=A0 struct drm_pagemap_addr addr); > + =C2=A0=C2=A0=C2=A0=C2=A0 const struct drm_pagemap_addr *addr); > =C2=A0 > =C2=A0 /** > =C2=A0 * @populate_mm: Populate part of the mm with @dpagemap > memory,