From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (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 DF3963358B1 for ; Tue, 17 Feb 2026 12:21:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771330878; cv=none; b=YJKLSHqx6+SydfI5M1jZY8QC8Y/1V6gtE0CuArClIxygcchF0wPQmPcNXdR6W7CYxU9tPO0QES/chb0XVdgQT6uYa+ZqIjarBro8z6xcUth7qSNP3pJuxc/y7vEiBi0gzOAM6MmMl/fme/iGJhtR3ZzlH17JEWxki0Qmfo98mtE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771330878; c=relaxed/simple; bh=4izq+YKgwQE8GCdVAv9mdn7fCEn5yMG7iw+rehpJHsY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DkhdoUyaD7XgjKApJYtz3yZo0kovK0gg2Et6jIyPLQMRWvXC1HTJQpn1wlPm0XBQ/JyyW8YNZthAmgsxQvuzPwwPpgpouOpXhL3Wu7LOJp0+mnAzPWau+cy/2Xx8KWSYTlUHOt5Az7GmxLXlsXwKzhKO6Bk0HLZSk2zx+3aiFmU= 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=bqS1BbBq; arc=none smtp.client-ip=198.175.65.10 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="bqS1BbBq" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1771330876; x=1802866876; h=message-id:subject:from:to:cc:date:in-reply-to: references:content-transfer-encoding:mime-version; bh=4izq+YKgwQE8GCdVAv9mdn7fCEn5yMG7iw+rehpJHsY=; b=bqS1BbBqj+o6WQ2/ybKLgboo3gwnSmzGYFh5n8/DN1Up4vBSMbdgYg4W ikOcPvz02VWFrHQylGUhR2hhuoGJOM/wxmOsHwP1t0E7EQkrYk/sDGmlx Lr46xsSrCKZx+npPPYQD+1PMXuO8ChOpr6/+FBVIgjGhNjbTSNn/LzYup fVhwfJNVN5+i8bK9ONbLkE+0Kc/tWPylpe9Lrw0xAMZOWR2VNXXoj0wiq riOwZ4pHZBfAO4FiPRz5f8ZEqBIiEHYOTJ9klrgS7870FdxBb61LyT+XP kdZ4lqlTrvZ+bsdQ+YBCO0Dg6m8rxVE5PZIyY0GR9j1dh4YyXzMhUbE1X g==; X-CSE-ConnectionGUID: hkl8b4qJT9WWLjwjTnW2cQ== X-CSE-MsgGUID: 7r8XdgqOTs2/CV485dq08Q== X-IronPort-AV: E=McAfee;i="6800,10657,11703"; a="89809019" X-IronPort-AV: E=Sophos;i="6.21,296,1763452800"; d="scan'208";a="89809019" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Feb 2026 04:21:15 -0800 X-CSE-ConnectionGUID: KPTNaLOrTzi6YVibenDfZw== X-CSE-MsgGUID: uS7PpQBgQFGX8WpgMolvUQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,296,1763452800"; d="scan'208";a="212082673" Received: from abityuts-desk.ger.corp.intel.com (HELO [10.245.245.127]) ([10.245.245.127]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Feb 2026 04:21:11 -0800 Message-ID: <9973d23893b3ce8ca4132e72fe833b6066b277c0.camel@linux.intel.com> 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 , Matthew Auld , Francois Dugast , Andrew Morton , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-xe@lists.freedesktop.org Date: Tue, 17 Feb 2026 13:21:09 +0100 In-Reply-To: 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 3.58.3 (3.58.3-1.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 14:59 +0100, Thomas Hellstr=C3=B6m wrote: > 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 >=20 > Thanks. >=20 > Reviewed-by: Thomas Hellstr=C3=B6m >=20 > Will push to drm-misc-fixes once CI is complete. Merged to drm-xe-next. Will likely appear after the next drm-xe-fixes PR in 7.0-rc2. Thanks, Thomas >=20 > /Thomas >=20 >=20 > > --- > > =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,