From nobody Tue Apr 7 10:38:51 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 35137ECAAD8 for ; Mon, 29 Aug 2022 21:25:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229770AbiH2VZy (ORCPT ); Mon, 29 Aug 2022 17:25:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60112 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229575AbiH2VZn (ORCPT ); Mon, 29 Aug 2022 17:25:43 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2778F57200 for ; Mon, 29 Aug 2022 14:25:42 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-33daeaa6b8eso146119777b3.7 for ; Mon, 29 Aug 2022 14:25:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc; bh=r66X5QU6Hd1zKKrQM4VdH4G/hUbDUrS2PjBFocCJ7kE=; b=f0ZITQpEExaLaSKDQb+h3/jYVFf5BjWfu0A0p9NMJ80xDBwkhscojqDzgDQ6W2gLIU JqyvlNc6N0TYQxhXpPiBzGuyzj1xr5cqDIbNzDR0v00qVutFwkDUQtyKnSj2Dn+NYRmF XbYPUhr7ZlEh9zlxoVr+7UyC5/R2ipvFX7ptRmhGZgjobP0J3ITaBrEOKND2CAY9iU2J fnwalrszPulqwRWfSp/VwWSeSLynEBR581yqV4QALN8e0aPzId5HIRtAjN2fmV4usJpw ghPowcSLA4CLZg9Bm0wFQDYbe3eb9NsWWsLPsurv1jkHcSRK8KYhRIFhxtRmb7OcOQkd NeDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc; bh=r66X5QU6Hd1zKKrQM4VdH4G/hUbDUrS2PjBFocCJ7kE=; b=UiwEdxtkM35KNZtuQzLnuh0nrNVjlMUE52Z9AXby6hwIZJDjDYJnjADX7d0nZ8ZEyM Rd1f1OCrDEhVig6XlcOMbVai6ZaW/ce8wWZuYM0u80H+tsKsXeW155ghhzG9LFtj9+t+ ZmVudga/Yf492Am9bsll8uWNtdpl6PDoA6jDYohQ/cmrIrvWvrxPUePRRM4rD6294CZM JuwSkR12Cb744EttyQc9zPGrjDPzJNGy0P+cswJQuXVytovXzo2+y1y4zFkzy/XsL56S pHdtNOwsrG0vjzZWLGumnx9eTuv/a4e4txP36rFLkpMN819tzOUPK6vESFTdtk9MvUH5 eYFQ== X-Gm-Message-State: ACgBeo0dcufAtSkoipyKWMKr11nSprS7MiM8ARNRoedFSGwxe8Rz3xlW 5juPM5PxuUZPeHZ37xuruGVBWD2k3Y0= X-Google-Smtp-Source: AA6agR7RORyYEvgHp7XQu1QQYhj/biZijMsx0xRWZsAvcqgghjoomkWy7B4TiExDCzWJq5q+aaEXQCYL4WE= X-Received: from surenb-spec.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3e30]) (user=surenb job=sendgmr) by 2002:a25:254f:0:b0:695:7c37:9202 with SMTP id l76-20020a25254f000000b006957c379202mr10232936ybl.79.1661808341087; Mon, 29 Aug 2022 14:25:41 -0700 (PDT) Date: Mon, 29 Aug 2022 21:25:06 +0000 In-Reply-To: <20220829212531.3184856-1-surenb@google.com> Mime-Version: 1.0 References: <20220829212531.3184856-1-surenb@google.com> X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220829212531.3184856-4-surenb@google.com> Subject: [RFC PATCH 03/28] mm: introduce __find_vma to be used without mmap_lock protection From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, laurent.dufour@fr.ibm.com, paulmck@kernel.org, riel@surriel.com, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, surenb@google.com, kernel-team@android.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add __find_vma function to be used for VMA lookup under rcu protection. Signed-off-by: Suren Baghdasaryan --- drivers/gpu/drm/i915/i915_gpu_error.c | 4 ++-- include/linux/mm.h | 9 ++++++++- mm/mmap.c | 6 ++---- 3 files changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i= 915_gpu_error.c index 32e92651ef7c..fc94985c95c8 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -507,7 +507,7 @@ static void error_print_context(struct drm_i915_error_s= tate_buf *m, } =20 static struct i915_vma_coredump * -__find_vma(struct i915_vma_coredump *vma, const char *name) +__i915_find_vma(struct i915_vma_coredump *vma, const char *name) { while (vma) { if (strcmp(vma->name, name) =3D=3D 0) @@ -521,7 +521,7 @@ __find_vma(struct i915_vma_coredump *vma, const char *n= ame) struct i915_vma_coredump * intel_gpu_error_find_batch(const struct intel_engine_coredump *ee) { - return __find_vma(ee->vma, "batch"); + return __i915_find_vma(ee->vma, "batch"); } =20 static void error_print_engine(struct drm_i915_error_state_buf *m, diff --git a/include/linux/mm.h b/include/linux/mm.h index 21f8b27bd9fd..7d322a979455 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2712,7 +2712,14 @@ extern int expand_upwards(struct vm_area_struct *vma= , unsigned long address); #endif =20 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ -extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned lo= ng addr); +extern struct vm_area_struct *__find_vma(struct mm_struct *mm, unsigned lo= ng addr); +static inline +struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) +{ + mmap_assert_locked(mm); + return __find_vma(mm, addr); +} + extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsign= ed long addr, struct vm_area_struct **pprev); =20 diff --git a/mm/mmap.c b/mm/mmap.c index 9d780f415be3..693e6776be39 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2250,12 +2250,11 @@ get_unmapped_area(struct file *file, unsigned long = addr, unsigned long len, EXPORT_SYMBOL(get_unmapped_area); =20 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ -struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) +struct vm_area_struct *__find_vma(struct mm_struct *mm, unsigned long addr) { struct rb_node *rb_node; struct vm_area_struct *vma; =20 - mmap_assert_locked(mm); /* Check the cache first. */ vma =3D vmacache_find(mm, addr); if (likely(vma)) @@ -2281,8 +2280,7 @@ struct vm_area_struct *find_vma(struct mm_struct *mm,= unsigned long addr) vmacache_update(addr, vma); return vma; } - -EXPORT_SYMBOL(find_vma); +EXPORT_SYMBOL(__find_vma); =20 /* * Same as find_vma, but also return a pointer to the previous VMA in *ppr= ev. --=20 2.37.2.672.g94769d06f0-goog