linux-kernel - Re: [PATCH bpf-next 5/5] bpf: trampoline: support FTRACE_OPS_FL_SHARE

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Message-ID: <202206020957.KETjl2xP-lkp@intel.com>
Date:   Thu, 2 Jun 2022 09:30:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Song Liu <song@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kernel-team@...com, rostedt@...dmis.org,
        jolsa@...nel.org, Song Liu <song@...nel.org>
Subject: Re: [PATCH bpf-next 5/5] bpf: trampoline: support
 FTRACE_OPS_FL_SHARE_IPMODIFY

Hi Song,

I love your patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Song-Liu/ftrace-host-klp-and-bpf-trampoline-together/20220602-020112
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: x86_64-randconfig-a006 (https://download.01.org/0day-ci/archive/20220602/202206020957.KETjl2xP-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/7edcf1c49617641579f2bc36b86c7d59bea20aef
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Song-Liu/ftrace-host-klp-and-bpf-trampoline-together/20220602-020112
        git checkout 7edcf1c49617641579f2bc36b86c7d59bea20aef
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   kernel/bpf/trampoline.c: In function 'bpf_trampoline_lookup':
>> kernel/bpf/trampoline.c:101:17: error: 'struct ftrace_ops' has no member named 'ops_func'
     101 |         tr->fops->ops_func = bpf_tramp_ftrace_ops_func;
         |                 ^~
   kernel/bpf/trampoline.c: In function 'bpf_trampoline_update':
>> kernel/bpf/trampoline.c:416:25: error: 'struct ftrace_ops' has no member named 'trampoline'
     416 |                 tr->fops->trampoline = 0;
         |                         ^~


vim +101 kernel/bpf/trampoline.c

    74	
    75	static struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
    76	{
    77		struct bpf_trampoline *tr;
    78		struct hlist_head *head;
    79		int i;
    80	
    81		mutex_lock(&trampoline_mutex);
    82		head = &trampoline_table[hash_64(key, TRAMPOLINE_HASH_BITS)];
    83		hlist_for_each_entry(tr, head, hlist) {
    84			if (tr->key == key) {
    85				refcount_inc(&tr->refcnt);
    86				goto out;
    87			}
    88		}
    89		tr = kzalloc(sizeof(*tr), GFP_KERNEL);
    90		if (!tr)
    91			goto out;
    92		tr->fops = kzalloc(sizeof(struct ftrace_ops), GFP_KERNEL);
    93		if (!tr->fops) {
    94			kfree(tr);
    95			tr = NULL;
    96			goto out;
    97		}
    98	
    99		tr->key = key;
   100		tr->fops->private = tr;
 > 101		tr->fops->ops_func = bpf_tramp_ftrace_ops_func;
   102		INIT_HLIST_NODE(&tr->hlist);
   103		hlist_add_head(&tr->hlist, head);
   104		refcount_set(&tr->refcnt, 1);
   105		mutex_init(&tr->mutex);
   106		for (i = 0; i < BPF_TRAMP_MAX; i++)
   107			INIT_HLIST_HEAD(&tr->progs_hlist[i]);
   108	out:
   109		mutex_unlock(&trampoline_mutex);
   110		return tr;
   111	}
   112	

-- 
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https://01.org/lkp