bpf.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Yafang Shao <laoar.shao@gmail.com>
To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
	kafai@fb.com, songliubraving@fb.com, yhs@fb.com,
	john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
	haoluo@google.com, jolsa@kernel.org
Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
	Yafang Shao <laoar.shao@gmail.com>
Subject: [RFC PATCH bpf-next 04/13] bpf: No need to check if id is 0
Date: Sun, 26 Mar 2023 09:21:59 +0000	[thread overview]
Message-ID: <20230326092208.13613-5-laoar.shao@gmail.com> (raw)
In-Reply-To: <20230326092208.13613-1-laoar.shao@gmail.com>

idr_alloc_cyclic() will return -ENOSPC if there's no available IDs, so
don't need to check if the id is less than the start number.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
 kernel/bpf/syscall.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index e18ac7f..f3664f2 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -387,9 +387,6 @@ static int bpf_map_alloc_id(struct bpf_map *map)
 	spin_unlock_bh(&map_idr_lock);
 	idr_preload_end();
 
-	if (WARN_ON_ONCE(!id))
-		return -ENOSPC;
-
 	return id > 0 ? 0 : id;
 }
 
@@ -2032,10 +2029,6 @@ static int bpf_prog_alloc_id(struct bpf_prog *prog)
 	spin_unlock_bh(&prog_idr_lock);
 	idr_preload_end();
 
-	/* id is in [1, INT_MAX) */
-	if (WARN_ON_ONCE(!id))
-		return -ENOSPC;
-
 	return id > 0 ? 0 : id;
 }
 
-- 
1.8.3.1


  parent reply	other threads:[~2023-03-26  9:22 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-26  9:21 [RFC PATCH bpf-next 00/13] bpf: Introduce BPF namespace Yafang Shao
2023-03-26  9:21 ` [RFC PATCH bpf-next 01/13] fork: New clone3 flag for " Yafang Shao
2023-03-26  9:21 ` [RFC PATCH bpf-next 02/13] proc_ns: Extend the field type in struct proc_ns_operations to long Yafang Shao
2023-03-26  9:21 ` [RFC PATCH bpf-next 03/13] bpf: Implement bpf namespace Yafang Shao
2023-03-26  9:21 ` Yafang Shao [this message]
2023-03-26  9:22 ` [RFC PATCH bpf-next 05/13] bpf: Make bpf objects id have the same alloc and free pattern Yafang Shao
2023-03-26  9:22 ` [RFC PATCH bpf-next 06/13] bpf: Helpers to alloc and free object id in bpf namespace Yafang Shao
2023-03-26  9:22 ` [RFC PATCH bpf-next 07/13] bpf: Add bpf helper to get bpf object id Yafang Shao
2023-03-26  9:22 ` [RFC PATCH bpf-next 08/13] bpf: Alloc and free bpf_map id in bpf namespace Yafang Shao
2023-03-26 10:50   ` Toke Høiland-Jørgensen
2023-03-27  2:44     ` Yafang Shao
2023-03-26  9:22 ` [RFC PATCH bpf-next 09/13] bpf: Alloc and free bpf_prog " Yafang Shao
2023-03-26  9:22 ` [RFC PATCH bpf-next 10/13] bpf: Alloc and free bpf_link " Yafang Shao
2023-03-26  9:22 ` [RFC PATCH bpf-next 11/13] bpf: Allow iterating bpf objects with CAP_BPF " Yafang Shao
2023-03-26  9:22 ` [RFC PATCH bpf-next 12/13] bpf: Use bpf_idr_lock array instead Yafang Shao
2023-03-26  9:22 ` [RFC PATCH bpf-next 13/13] selftests/bpf: Add selftest for bpf namespace Yafang Shao
2023-03-26 10:49 ` [RFC PATCH bpf-next 00/13] bpf: Introduce BPF namespace Toke Høiland-Jørgensen
2023-03-27  3:07   ` Yafang Shao
2023-03-27 20:51     ` Toke Høiland-Jørgensen
2023-03-28  3:48       ` Yafang Shao
2023-03-27 17:28 ` Stanislav Fomichev
2023-03-28  3:42   ` Yafang Shao
2023-03-28 17:15     ` Stanislav Fomichev
2023-03-29  3:02       ` Yafang Shao
2023-03-29 20:50         ` Stanislav Fomichev
2023-03-30  2:40           ` Yafang Shao
2023-03-27 19:03 ` Song Liu
2023-03-28  3:47   ` Yafang Shao
2023-04-02 23:37     ` Alexei Starovoitov
2023-04-03  3:05       ` Yafang Shao
2023-04-03 22:50         ` Alexei Starovoitov
2023-04-04  2:59           ` Yafang Shao
2023-04-06  2:06             ` Alexei Starovoitov
2023-04-06  2:54               ` Yafang Shao
2023-04-06  3:05                 ` Alexei Starovoitov
2023-04-06  3:22                   ` Yafang Shao
2023-04-06  4:24                     ` Alexei Starovoitov
2023-04-06  5:43                       ` Yafang Shao
2023-04-06 20:22                         ` Andrii Nakryiko
2023-04-07  1:43                           ` Alexei Starovoitov
2023-04-07  4:33                             ` Yafang Shao
2023-04-07 15:32                               ` Alexei Starovoitov
2023-04-07 15:59                             ` Andrii Nakryiko
2023-04-07 16:05                               ` Alexei Starovoitov
2023-04-07 16:21                                 ` Yafang Shao
2023-04-07 16:31                                   ` Alexei Starovoitov
2023-04-07 16:35                                     ` Yafang Shao
2023-03-31  5:52 ` Hao Luo
2023-04-01 16:32   ` Yafang Shao

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20230326092208.13613-5-laoar.shao@gmail.com \
    --to=laoar.shao@gmail.com \
    --cc=andrii@kernel.org \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=haoluo@google.com \
    --cc=john.fastabend@gmail.com \
    --cc=jolsa@kernel.org \
    --cc=kafai@fb.com \
    --cc=kpsingh@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sdf@google.com \
    --cc=songliubraving@fb.com \
    --cc=yhs@fb.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).