From nobody Sun Feb 8 15:58:30 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E3ACE7F7FC for ; Wed, 21 Feb 2024 14:06:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708524400; cv=none; b=a4njMEfY0UIcz79nzxWfFUq6ec0AXv04f9xeNDz5DRnVaJxNhLpjMd6RkgmSqrcGb/GGVdk6FoGgtVVHyXflPg41DWDYaK0aZ1KrvWMAvdoNuItTYL+kDGpizLkHo/pl941seUlOnEvhzVX/U2QKcB/O/IjheSudIb1fsAFiZDg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708524400; c=relaxed/simple; bh=kD7M7W5im/QqyD+BL+StSePiG4RjxVtgbKA8LCF5L70=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=ZYa2B0jqB5eXb6uU2XP9JNZl7V8D7UvAmlodLkf8xgj3W9rhpJDQs+5k9yU9GLotZgSyBRjNLGUzyFRIlTrbjus7GQivj70w6dXNIJ9gqjGqtlBqNSq0RuHJs0O0/0IuG39tN84xEQNwCOmnvstdEWnYbmzKWPX73AhYpNpHOqE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id C48A9C43609; Wed, 21 Feb 2024 14:06:40 +0000 (UTC) Received: from rostedt by gandalf with local (Exim 4.97) (envelope-from ) id 1rcnGu-00000002i9q-43P5; Wed, 21 Feb 2024 09:08:28 -0500 Message-ID: <20240221140828.828440398@goodmis.org> User-Agent: quilt/0.67 Date: Wed, 21 Feb 2024 09:08:02 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Vincent Donnefort Subject: [for-next][PATCH 06/11] ring-buffer: Zero ring-buffer sub-buffers References: <20240221140756.797572998@goodmis.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Vincent Donnefort In preparation for the ring-buffer memory mapping where each subbuf will be accessible to user-space, zero all the page allocations. Link: https://lore.kernel.org/linux-trace-kernel/20240220202310.2489614-2-v= donnefort@google.com Signed-off-by: Vincent Donnefort Reviewed-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) --- kernel/trace/ring_buffer.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index fd4bfe3ecf01..ca796675c0a1 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1472,7 +1472,8 @@ static int __rb_allocate_pages(struct ring_buffer_per= _cpu *cpu_buffer, =20 list_add(&bpage->list, pages); =20 - page =3D alloc_pages_node(cpu_to_node(cpu_buffer->cpu), mflags, + page =3D alloc_pages_node(cpu_to_node(cpu_buffer->cpu), + mflags | __GFP_ZERO, cpu_buffer->buffer->subbuf_order); if (!page) goto free_pages; @@ -1557,7 +1558,8 @@ rb_allocate_cpu_buffer(struct trace_buffer *buffer, l= ong nr_pages, int cpu) =20 cpu_buffer->reader_page =3D bpage; =20 - page =3D alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL, cpu_buffer->buffe= r->subbuf_order); + page =3D alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_ZERO, + cpu_buffer->buffer->subbuf_order); if (!page) goto fail_free_reader; bpage->page =3D page_address(page); @@ -5525,7 +5527,8 @@ ring_buffer_alloc_read_page(struct trace_buffer *buff= er, int cpu) if (bpage->data) goto out; =20 - page =3D alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_NORETRY, + page =3D alloc_pages_node(cpu_to_node(cpu), + GFP_KERNEL | __GFP_NORETRY | __GFP_ZERO, cpu_buffer->buffer->subbuf_order); if (!page) { kfree(bpage); --=20 2.43.0