From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) (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 E4E3F1DFFB for ; Mon, 3 Aug 2026 10:34:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785753286; cv=none; b=m1ZhXBaxCIKMlH2zO3AWihDSc6EY1yJ5Sfj5JGJ9i95w7mw9F/6E/kIrEeD2pZJNSBU9cTOkdkGZZxlhYX0ioREuTlmLqR9+Wq7qQSy461SPXtaPNnj22gH9uB2ctZErmD5p48UKxCT8kcDdYrx5GwPZYoqghBipsjeacAZjqOc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785753286; c=relaxed/simple; bh=WGhUEMZJwtV+YhtkO9VJacDbNj8JfZs3tY3cSu/1nwM=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Et2XMRf2aHEPOaf0ZsgSDmOiSWK5Vx7tGioIDVI2W+8dslwkIpejdaoCB60DXDo32Bqy1jdWbUb7lMcGqazPBrsVwBUe2/JCcBZW/G/0SIibIRVO7txKHK3k/tAgurq+C78XjW1HBpbl+BbOJrLSqA5hLyHkkQWeiZ9Okd4InDc= 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=209.85.128.71 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-f71.google.com with SMTP id 5b1f17b1804b1-4954fe32d6eso8377425e9.1 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=GpffT83scGYdCLEfcSEHts3g+LJhJYPXCph/NsgFDu6aRfAroVo5RHAfx4jIGX8iEy TjFV/ROvcbZvdlR7J309dv4P+Tg4phKVjo+jAsXAc76tOlw2n8cXFUE1rIRPbT+txrbL AOy+IG4W9JEPPh9DD370XHnbSZ2m7EcBsJ7oWW+kRK6IeD05SioaPmwJjjUskLyaSjB+ gpQTTiu+Wj2WukK+l2UH1a2PG3MerfPUWwM4e7KdTjDWEngGVWph4udh2eV/B4D7rZKB zsudvh46PCKAiqbsIeQY/D/c4kPwqBWa0WEoLnq8fUsAoP3pkcyaUdE8JLnz5e+kPLk/ VG5A== X-Forwarded-Encrypted: i=1; AHgh+RrHVBhdTtNYrP22rnUkhH++qlAQ4QxkjyGAnJbEcXH6Nu+UUBDvInCuv347RoX647zYri0Yd1s=@vger.kernel.org X-Gm-Message-State: AOJu0YyTer9ymawSxCIuT+gayFPjAn6FvE4EuvwbY3tb8u963iDuM1XA ndn5idviPykLwTl93oIMiRhquI2ELRKIqNisPRUESYIimMa0dKyHRcUYkKXxI9aIPdqnG1QXy2o ixDpmllHwq/P0dDW9dw== 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: netdev@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