From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9974C5DF60 for ; Tue, 5 Nov 2019 21:23:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9CBFF21D7C for ; Tue, 5 Nov 2019 21:23:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="celvBsXj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729656AbfKEVXt (ORCPT ); Tue, 5 Nov 2019 16:23:49 -0500 Received: from hqemgate15.nvidia.com ([216.228.121.64]:2510 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729813AbfKEVXs (ORCPT ); Tue, 5 Nov 2019 16:23:48 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 05 Nov 2019 13:22:48 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 05 Nov 2019 13:23:47 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 05 Nov 2019 13:23:47 -0800 Received: from [10.110.48.28] (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 5 Nov 2019 21:23:46 +0000 Subject: Re: [PATCH v2 01/15] mm/mmu_notifier: define the header pre-processor parts even if disabled To: Jason Gunthorpe , , Jerome Glisse , Ralph Campbell , CC: , , , Alex Deucher , Ben Skeggs , Boris Ostrovsky , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Zhou , "Dennis Dalessandro" , Juergen Gross , Mike Marciniszyn , Oleksandr Andrushchenko , Petr Cvek , Stefano Stabellini , , , "Christoph Hellwig" , Jason Gunthorpe References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-2-jgg@ziepe.ca> X-Nvconfidentiality: public From: John Hubbard Message-ID: <770248ae-efa1-efae-a978-f52d8510f7b1@nvidia.com> Date: Tue, 5 Nov 2019 13:23:46 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20191028201032.6352-2-jgg@ziepe.ca> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1572988968; bh=aIPY8mqXA6lyZUc1rKx70R2LwJeuNYEhmJdJmillLnc=; h=X-PGP-Universal:Subject:To:CC:References:X-Nvconfidentiality:From: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=celvBsXjtms5s/fHMENIzqr1AZL6V3afb2TmXOj9/auCgSpw020ovgGj6sUJY6wUi 8FZQW7VU2uJLmF0z7zWq5LTLWiAamnDIr/6bhHTVSgPpOmvUAR1oUqmuppIzNL3wJO ysV1KcarpWhwDx0XqrSBdFmymxTizUIpNIcN7AM6qREXee//lWIVE0AwpLY1l5ZIk7 IOniAcaPCzRmZ2jCMf1W7i6xri8LcQzCVMPAcukyjxn/by0Q3PYe7Vbwx2OWpB8aKm Yd7LmkMXL2AGdGoFghJ6PsBH99PmbYY9fA0V8aX32R3g6ETbPcBT1SC2bBbbs4GWFg QOkJy1BbD1U0g== Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On 10/28/19 1:10 PM, Jason Gunthorpe wrote: > From: Jason Gunthorpe >=20 > Now that we have KERNEL_HEADER_TEST all headers are generally compile > tested, so relying on makefile tricks to avoid compiling code that depend= s > on CONFIG_MMU_NOTIFIER is more annoying. >=20 > Instead follow the usual pattern and provide most of the header with only > the functions stubbed out when CONFIG_MMU_NOTIFIER is disabled. This > ensures code compiles no matter what the config setting is. >=20 > While here, struct mmu_notifier_mm is private to mmu_notifier.c, move it. and correct a minor spelling error in a comment. Good. :) >=20 > Reviewed-by: J=C3=A9r=C3=B4me Glisse > Signed-off-by: Jason Gunthorpe > --- > include/linux/mmu_notifier.h | 46 +++++++++++++----------------------- > mm/mmu_notifier.c | 13 ++++++++++ > 2 files changed, 30 insertions(+), 29 deletions(-) >=20 Because this is correct as-is, you can add: Reviewed-by: John Hubbard ...whether or not you take the following recommendation, which is: you've only done part of the job of making struct mmu_notifier_mm=20 private to mmu_notifier.c. There's more: * struct mmu_notifier_mm is referred to in two places now: mm_types.h and (still) mmu_notifier.h. Therefore: a) Move the last two traces of it out of mmu_notifier.h, and b) Put a forward declaration in mm_types.h, which is where it belongs because that's where it's referred to. So if you apply this incremental patch on top, I think it's where you want to be: diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 2222fa795284..df93a3cc0da9 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -25,6 +25,7 @@ =20 struct address_space; struct mem_cgroup; +struct mmu_notifier_mm; =20 /* * Each physical page in the system has a struct page associated with diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 51b92ba013dd..84efd2c51f5c 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -8,7 +8,6 @@ #include #include =20 -struct mmu_notifier_mm; struct mmu_notifier; struct mmu_notifier_range; struct mmu_range_notifier; @@ -263,10 +262,7 @@ struct mmu_notifier_range { enum mmu_notifier_event event; }; =20 -static inline int mm_has_notifiers(struct mm_struct *mm) -{ - return unlikely(mm->mmu_notifier_mm); -} +int mm_has_notifiers(struct mm_struct *mm); =20 struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops= *ops, struct mm_struct *mm); @@ -477,10 +473,7 @@ static inline void mmu_notifier_invalidate_range(struc= t mm_struct *mm, __mmu_notifier_invalidate_range(mm, start, end); } =20 -static inline void mmu_notifier_mm_init(struct mm_struct *mm) -{ - mm->mmu_notifier_mm =3D NULL; -} +void mmu_notifier_mm_init(struct mm_struct *mm); =20 static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) { diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 2b7485919ecf..107f9406a92d 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -47,6 +47,16 @@ struct mmu_notifier_mm { struct hlist_head deferred_list; }; =20 +int mm_has_notifiers(struct mm_struct *mm) +{ + return unlikely(mm->mmu_notifier_mm); +} + +void mmu_notifier_mm_init(struct mm_struct *mm) +{ + mm->mmu_notifier_mm =3D NULL; +} + /* * This is a collision-retry read-side/write-side 'lock', a lot like a * seqcount, however this allows multiple write-sides to hold it at thanks, John Hubbard NVIDIA > diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h > index 1bd8e6a09a3c27..12bd603d318ce7 100644 > --- a/include/linux/mmu_notifier.h > +++ b/include/linux/mmu_notifier.h > @@ -7,8 +7,9 @@ > #include > #include > =20 > +struct mmu_notifier_mm; > struct mmu_notifier; > -struct mmu_notifier_ops; > +struct mmu_notifier_range; > =20 > /** > * enum mmu_notifier_event - reason for the mmu notifier callback > @@ -40,36 +41,8 @@ enum mmu_notifier_event { > MMU_NOTIFY_SOFT_DIRTY, > }; > =20 > -#ifdef CONFIG_MMU_NOTIFIER > - > -#ifdef CONFIG_LOCKDEP > -extern struct lockdep_map __mmu_notifier_invalidate_range_start_map; > -#endif > - > -/* > - * The mmu notifier_mm structure is allocated and installed in > - * mm->mmu_notifier_mm inside the mm_take_all_locks() protected > - * critical section and it's released only when mm_count reaches zero > - * in mmdrop(). > - */ > -struct mmu_notifier_mm { > - /* all mmu notifiers registerd in this mm are queued in this list */ > - struct hlist_head list; > - /* to serialize the list modifications and hlist_unhashed */ > - spinlock_t lock; > -}; > - > #define MMU_NOTIFIER_RANGE_BLOCKABLE (1 << 0) > =20 > -struct mmu_notifier_range { > - struct vm_area_struct *vma; > - struct mm_struct *mm; > - unsigned long start; > - unsigned long end; > - unsigned flags; > - enum mmu_notifier_event event; > -}; > - > struct mmu_notifier_ops { > /* > * Called either by mmu_notifier_unregister or when the mm is > @@ -249,6 +222,21 @@ struct mmu_notifier { > unsigned int users; > }; > =20 > +#ifdef CONFIG_MMU_NOTIFIER > + > +#ifdef CONFIG_LOCKDEP > +extern struct lockdep_map __mmu_notifier_invalidate_range_start_map; > +#endif > + > +struct mmu_notifier_range { > + struct vm_area_struct *vma; > + struct mm_struct *mm; > + unsigned long start; > + unsigned long end; > + unsigned flags; > + enum mmu_notifier_event event; > +}; > + > static inline int mm_has_notifiers(struct mm_struct *mm) > { > return unlikely(mm->mmu_notifier_mm); > diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c > index 7fde88695f35d6..367670cfd02b7b 100644 > --- a/mm/mmu_notifier.c > +++ b/mm/mmu_notifier.c > @@ -27,6 +27,19 @@ struct lockdep_map __mmu_notifier_invalidate_range_sta= rt_map =3D { > }; > #endif > =20 > +/* > + * The mmu notifier_mm structure is allocated and installed in > + * mm->mmu_notifier_mm inside the mm_take_all_locks() protected > + * critical section and it's released only when mm_count reaches zero > + * in mmdrop(). > + */ > +struct mmu_notifier_mm { > + /* all mmu notifiers registered in this mm are queued in this list */ > + struct hlist_head list; > + /* to serialize the list modifications and hlist_unhashed */ > + spinlock_t lock; > +}; > + > /* > * This function can't run concurrently against mmu_notifier_register > * because mm->mm_users > 0 during mmu_notifier_register and exit_mmap >=20 From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Hubbard Subject: Re: [PATCH v2 01/15] mm/mmu_notifier: define the header pre-processor parts even if disabled Date: Tue, 5 Nov 2019 13:23:46 -0800 Message-ID: <770248ae-efa1-efae-a978-f52d8510f7b1@nvidia.com> References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-2-jgg@ziepe.ca> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20191028201032.6352-2-jgg@ziepe.ca> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Jason Gunthorpe , linux-mm@kvack.org, Jerome Glisse , Ralph Campbell , Felix.Kuehling@amd.com Cc: Juergen Gross , Mike Marciniszyn , Stefano Stabellini , Oleksandr Andrushchenko , linux-rdma@vger.kernel.org, nouveau@lists.freedesktop.org, Dennis Dalessandro , amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , dri-devel@lists.freedesktop.org, Alex Deucher , xen-devel@lists.xenproject.org, 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nouveau@lists.freedesktop.org, Dennis Dalessandro , amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , dri-devel@lists.freedesktop.org, Alex Deucher , xen-devel@lists.xenproject.org, Boris Ostrovsky , Petr Cvek , =?UTF-8?Q?Christian_K=c3=b6nig?= , Ben Skeggs Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" T24gMTAvMjgvMTkgMToxMCBQTSwgSmFzb24gR3VudGhvcnBlIHdyb3RlOgo+IEZyb206IEphc29u IEd1bnRob3JwZSA8amdnQG1lbGxhbm94LmNvbT4KPiAKPiBOb3cgdGhhdCB3ZSBoYXZlIEtFUk5F TF9IRUFERVJfVEVTVCBhbGwgaGVhZGVycyBhcmUgZ2VuZXJhbGx5IGNvbXBpbGUKPiB0ZXN0ZWQs IHNvIHJlbHlpbmcgb24gbWFrZWZpbGUgdHJpY2tzIHRvIGF2b2lkIGNvbXBpbGluZyBjb2RlIHRo YXQgZGVwZW5kcwo+IG9uIENPTkZJR19NTVVfTk9USUZJRVIgaXMgbW9yZSBhbm5veWluZy4KPiAK PiBJbnN0ZWFkIGZvbGxvdyB0aGUgdXN1YWwgcGF0dGVybiBhbmQgcHJvdmlkZSBtb3N0IG9mIHRo ZSBoZWFkZXIgd2l0aCBvbmx5Cj4gdGhlIGZ1bmN0aW9ucyBzdHViYmVkIG91dCB3aGVuIENPTkZJ 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