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Date: Fri, 8 Dec 2023 10:01:50 -0800
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Subject: Re: [PATCH RESEND bpf-next 2/2] bpf: Use GFP_KERNEL in
 bpf_event_entry_gen()
Content-Language: en-GB
To: Hou Tao <houtao@huaweicloud.com>, bpf@vger.kernel.org
Cc: Martin KaFai Lau <martin.lau@linux.dev>,
 Alexei Starovoitov <alexei.starovoitov@gmail.com>,
 Andrii Nakryiko <andrii@kernel.org>, Song Liu <song@kernel.org>,
 Hao Luo <haoluo@google.com>, Daniel Borkmann <daniel@iogearbox.net>,
 KP Singh <kpsingh@kernel.org>, Stanislav Fomichev <sdf@google.com>,
 Jiri Olsa <jolsa@kernel.org>, John Fastabend <john.fastabend@gmail.com>,
 houtao1@huawei.com
References: <20231208103357.2637299-1-houtao@huaweicloud.com>
 <20231208103357.2637299-3-houtao@huaweicloud.com>
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From: Yonghong Song <yonghong.song@linux.dev>
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On 12/8/23 2:33 AM, Hou Tao wrote:
> From: Hou Tao <houtao1@huawei.com>
>
> rcu_read_lock() is no longer held when invoking bpf_event_entry_gen()
> which is called by perf_event_fd_array_get_ptr(), so using GFP_KERNEL
> instead of GFP_ATOMIC to reduce the possibility of failures due to
> out-of-memory.
>
> Signed-off-by: Hou Tao <houtao1@huawei.com>

Acked-by: Yonghong Song <yonghong.song@linux.dev>