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Date: Thu, 12 Mar 2020 10:03:15 +0800
From: Li Zhijian <zhijianx.li@...el.com>
To: "Eric W. Biederman" <ebiederm@...ssion.com>,
kbuild test robot <lkp@...el.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [kbuild-all] Re: [PATCH 3/3] proc: Remove the now unnecessary
internal mount of proc
On 2/29/20 12:49 PM, Eric W. Biederman wrote:
> kbuild test robot <lkp@...el.com> writes:
>
>> Hi "Eric,
>>
>> Thank you for the patch! Yet something to improve:
> Dear kbuild robot,
>
> Yep. You got it the wrong base. I will see about using --base
> if I repost, or have another patchset that so clearly needs
> to be applied on top of a non-default base.
>
> Thank you for writing me how to do that.
Hi, Eric
May i know which tree/branch your patch is basing on ? this input might
help 0day robot to pickup the candidate bases more intelligent.
Thanks
Zhijian
>
> Eric
>
>
>> [auto build test ERROR on uml/linux-next]
>> [also build test ERROR on linux/master kees/for-next/pstore linus/master v5.6-rc3 next-20200228]
>> [if your patch is applied to the wrong git tree, please drop us a note to help
>> improve the system. BTW, we also suggest to use '--base' option to specify the
>> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>>
>> url: https://github.com/0day-ci/linux/commits/Eric-W-Biederman/proc-Actually-honor-the-mount-options/20200229-100926
>> base: https://git.kernel.org/pub/scm/linux/kernel/git/rw/uml.git linux-next
>> config: x86_64-defconfig (attached as .config)
>> compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
>> reproduce:
>> # save the attached .config to linux build tree
>> make ARCH=x86_64
>>
>> If you fix the issue, kindly add following tag
>> Reported-by: kbuild test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>):
>>
>> fs/proc/base.c: In function 'proc_flush_task':
>>>> fs/proc/base.c:3217:33: error: 'struct pid_namespace' has no member named 'proc_mnt'; did you mean 'proc_self'?
>> proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
>> ^~~~~~~~
>> proc_self
>>
>> vim +3217 fs/proc/base.c
>>
>> ^1da177e4c3f41 Linus Torvalds 2005-04-16 3180
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3181 /**
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3182 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3183 * @task: task that should be flushed.
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3184 *
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3185 * When flushing dentries from proc, one needs to flush them from global
>> 60347f6716aa49 Pavel Emelyanov 2007-10-18 3186 * proc (proc_mnt) and from all the namespaces' procs this task was seen
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3187 * in. This call is supposed to do all of this job.
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3188 *
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3189 * Looks in the dcache for
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3190 * /proc/@pid
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3191 * /proc/@...d/task/@pid
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3192 * if either directory is present flushes it and all of it'ts children
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3193 * from the dcache.
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3194 *
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3195 * It is safe and reasonable to cache /proc entries for a task until
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3196 * that task exits. After that they just clog up the dcache with
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3197 * useless entries, possibly causing useful dcache entries to be
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3198 * flushed instead. This routine is proved to flush those useless
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3199 * dcache entries at process exit time.
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3200 *
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3201 * NOTE: This routine is just an optimization so it does not guarantee
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3202 * that no dcache entries will exist at process exit time it
>> 0895e91d60ef9b Randy Dunlap 2007-10-21 3203 * just makes it very unlikely that any will persist.
>> 60347f6716aa49 Pavel Emelyanov 2007-10-18 3204 */
>> 60347f6716aa49 Pavel Emelyanov 2007-10-18 3205
>> 60347f6716aa49 Pavel Emelyanov 2007-10-18 3206 void proc_flush_task(struct task_struct *task)
>> 60347f6716aa49 Pavel Emelyanov 2007-10-18 3207 {
>> 9fcc2d15b14894 Eric W. Biederman 2007-11-14 3208 int i;
>> 9b4d1cbef8f41a Oleg Nesterov 2009-09-22 3209 struct pid *pid, *tgid;
>> 130f77ecb2e7d5 Pavel Emelyanov 2007-10-18 3210 struct upid *upid;
>> 130f77ecb2e7d5 Pavel Emelyanov 2007-10-18 3211
>> 130f77ecb2e7d5 Pavel Emelyanov 2007-10-18 3212 pid = task_pid(task);
>> 130f77ecb2e7d5 Pavel Emelyanov 2007-10-18 3213 tgid = task_tgid(task);
>> 9fcc2d15b14894 Eric W. Biederman 2007-11-14 3214
>> 9fcc2d15b14894 Eric W. Biederman 2007-11-14 3215 for (i = 0; i <= pid->level; i++) {
>> 130f77ecb2e7d5 Pavel Emelyanov 2007-10-18 3216 upid = &pid->numbers[i];
>> 130f77ecb2e7d5 Pavel Emelyanov 2007-10-18 @3217 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
>> 9b4d1cbef8f41a Oleg Nesterov 2009-09-22 3218 tgid->numbers[i].nr);
>> 130f77ecb2e7d5 Pavel Emelyanov 2007-10-18 3219 }
>> 60347f6716aa49 Pavel Emelyanov 2007-10-18 3220 }
>> 60347f6716aa49 Pavel Emelyanov 2007-10-18 3221
>>
>> :::::: The code at line 3217 was first introduced by commit
>> :::::: 130f77ecb2e7d5ac3e53e620f55e374f4a406b20 pid namespaces: make proc_flush_task() actually from entries from multiple namespaces
>>
>> :::::: TO: Pavel Emelyanov <xemul@...nvz.org>
>> :::::: CC: Linus Torvalds <torvalds@...dy.linux-foundation.org>
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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