From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DC1DB367B7B for ; Mon, 3 Aug 2026 10:34:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785753287; cv=none; b=PSj2A4w0mY+1QW1WWXS5oDu/WzZG1qR+pin1/qUJnTu59WLHhQJy50RfYX+8xTrOi0Vz2dUXihWLa0Gq8dHvlKuZPIB34ZtN1imAG299zih3YWN/uJ0HxCSJ8GXDfVRDBGXkGr7a06RdewB3RCMULKeY+HRHu0wVaiu2iY7opmg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785753287; c=relaxed/simple; bh=WGhUEMZJwtV+YhtkO9VJacDbNj8JfZs3tY3cSu/1nwM=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=BnmHmT9WO48FutMdzmGABnPkdDXSFmvXP5bhtdn6nPs2L0Oty9nPUrNQ7cV20XdW7ZICNQSBqIG0vS/+ts+NWjUdcQ4bJJ8bqQ8gOxJ1ucSyLjCl5JumgW943tMvyoSOpNKq9mR4Q1hTGsg+pDKxg/NjtASnS4x/kedx4h1bOgc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--aliceryhl.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=Vqfgfwmx; arc=none smtp.client-ip=209.85.128.70 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--aliceryhl.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Vqfgfwmx" Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-495529a93f9so20337045e9.3 for ; Mon, 03 Aug 2026 03:34:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785753283; x=1786358083; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=nrGZH1Bic7OrH5NVQ3GPF6/SmqVayjDt/OQQQF3cjOM=; b=Vqfgfwmx4jy0deU2Q2CwMJVOyASPYvwgRD8xQqJvrn0j/VJSMbvZ/4BbtOHR4ITDYv DQNe1F+kn0L0P0a0ur3XfjT+wWkzUlpomt+jGIZzt5Tvxx5qo189hCIcOLCiMFowRSEv rMlE6TkLfYtBQxx37JUa0TBYQj7+/LUF2+/Br4j0ucYelRtCojorVXHGuEH2VPfwQ7kL 9ixIqkWbCFmqIJhyzv+jWmocPYMcIwcB8hxfqzm7v9AE7qhfGXbkRou3biugXDeX7Nn0 xChmowJJuxJwEDlYcEVMk2P4Ja4++mkSzWU8K8HbXmt/ogaEjeVU+cw6Gtz5Xsy/RbTj NY5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785753283; x=1786358083; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=nrGZH1Bic7OrH5NVQ3GPF6/SmqVayjDt/OQQQF3cjOM=; b=JqwVDWvr+PZeyP1KSQM1erPiMfl9uU8ajy6E8jXnqWJNxR5r14M7y29FECoe0kuIw9 Nrl+Sz3QzXhyNTEa99k2Lw5IOIOKb3tUFzVwNx6GwmtuhWAJnEHyxiiGyez8NP1Qun08 egSVNU8Jewqar7bljSoMhn2abaycjT+PA+keCHwuQzjUG3aU+8G6Q970Du6HRKcQBSxk seW3eNM97tBDEc1ITg+9a0ppQBgmK7Z2GgrsBMD6hPkc2ZZPdINYQBM97O2x68CLL2Hs Z/GabpTgwz962cs4snv7d+w9VsFKnROBxZ7DxoTAEGM2BBfYNo4IXn6usb6PbNJZTuci yCFQ== X-Forwarded-Encrypted: i=1; AHgh+RqbGXE2W45Mo60RwOLKnw8Ajhq6gC2pu5x1naGsupKk0ofZsNqnEPLsEBJWBty9pRl0m29r9qseDKQZ18U=@vger.kernel.org X-Gm-Message-State: AOJu0Yz7d/X1uxU50fNfxmgGZd6tnZF/Vdk0BXfwLbMLiAHPG4wrOJti +qS5C1xuQll1cQOgZxwdHORa1ZJ/R16KATDZFWD3bH3yBjD0AaplkcmXaCemg4MsTzxyBNFI/mE iS1v5jAPoc2kfxfCdNA== X-Received: from wmaq1.prod.google.com ([2002:a05:600c:6c81:b0:493:ed72:8dad]) (user=aliceryhl job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:6092:b0:497:ff28:6deb with SMTP id 5b1f17b1804b1-4980c64b8bfmr238017025e9.11.1785753282903; Mon, 03 Aug 2026 03:34:42 -0700 (PDT) Date: Mon, 3 Aug 2026 10:34:42 +0000 In-Reply-To: <20260802215459.2769283-5-surenb@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260802215459.2769283-1-surenb@google.com> <20260802215459.2769283-5-surenb@google.com> Message-ID: Subject: Re: [PATCH v3 4/5] binder: Remove mmap_lock fallback From: Alice Ryhl To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, dave.hansen@linux.intel.com, Liam.Howlett@oracle.com, ljs@kernel.org, david@redhat.com, willy@infradead.org, shakeel.butt@linux.dev, vbabka@kernel.org, jannh@google.com, arve@android.com, cmllamas@google.com, christian@brauner.io, tkjos@android.com, dsahern@kernel.org, davem@davemloft.net, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org Content-Type: text/plain; charset="utf-8" On Sun, Aug 02, 2026 at 02:54:58PM -0700, Suren Baghdasaryan wrote: > From: Dave Hansen > > Previously, the per-VMA locking could fail in the face of writers > which necessitate a fallback to mmap_lock. The new > vma_start_read_unlocked() will wait for writers instead of failing. > > Use the new helper. Wait for writers. Remove the fallback to mmap_lock. > > Signed-off-by: Dave Hansen > Signed-off-by: Suren Baghdasaryan Reviewed-by: Alice Ryhl