linux-kernel - Re: [RFC bpf-next v4 4/7] btf: Add a new kfunc set which allows to mark a function to be sleepable

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Message-ID: <20220426041220.xsblwpvmcvceyaco@MBP-98dd607d3435.dhcp.thefacebook.com>
Date:   Mon, 25 Apr 2022 21:12:20 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [RFC bpf-next v4 4/7] btf: Add a new kfunc set which allows to
 mark a function to be sleepable

On Thu, Apr 21, 2022 at 04:07:37PM +0200, Benjamin Tissoires wrote:
> This allows to declare a kfunc as sleepable and prevents its use in
> a non sleepable program.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

makes sense.
> @@ -17,6 +17,7 @@ enum btf_kfunc_type {
>  	BTF_KFUNC_TYPE_ACQUIRE,
>  	BTF_KFUNC_TYPE_RELEASE,
>  	BTF_KFUNC_TYPE_RET_NULL,
> +	BTF_KFUNC_TYPE_SLEEPABLE,
>  	BTF_KFUNC_TYPE_MAX,
>  };
>  
> @@ -35,6 +36,7 @@ struct btf_kfunc_id_set {
>  			struct btf_id_set *acquire_set;
>  			struct btf_id_set *release_set;
>  			struct btf_id_set *ret_null_set;
> +			struct btf_id_set *sleepable_set;