linux-kernel - Re: [PATCH v10 1/8] sched/core: Add __might_sleep

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Message-Id: <20250217.154447.1251064594176317463.fujita.tomonori@gmail.com>
Date: Mon, 17 Feb 2025 15:44:47 +0900 (JST)
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: boqun.feng@...il.com
Cc: aliceryhl@...gle.com, fujita.tomonori@...il.com,
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Subject: Re: [PATCH v10 1/8] sched/core: Add __might_sleep_precision()

On Sun, 16 Feb 2025 17:51:32 -0800
Boqun Feng <boqun.feng@...il.com> wrote:

>> > >> +                                  unsigned int offsets)
>> > >>  {
>> > >>      /* Ratelimiting timestamp: */
>> > >>      static unsigned long prev_jiffy;
>> > >> @@ -8740,8 +8723,10 @@ void __might_resched(const char *file, int line, unsigned int offsets)
>> > >>      /* Save this before calling printk(), since that will clobber it: */
>> > >>      preempt_disable_ip = get_preempt_disable_ip(current);
>> > >>
>> > >> -    pr_err("BUG: sleeping function called from invalid context at %s:%d\n",
>> > >> -           file, line);
>> > >> +    if (len < 0)
>> > >> +            len = strlen(file);
>> > >
>> > > No need for strlen(), just use a big number instead of -1.
>> > > Anything bigger than a sane upper limit on the filename length will do.
>> >
>> > Ah, that's right. Just passing the maximum precision (1<<15-1) works.
>> >
>> > The precision specifies the maximum length. vsnprintf() always
>> > iterates through a string until it reaches the maximum length or
>> > encounters the null terminator. So strlen() here is useless.
>> >
>> > Alice and Boqun, the above change is fine? Can I keep the tags?
>> 
>> I'd probably like a comment explaining the meaning of this constant
>> somewhere, but sure ok with me.
>> 
> 
> Agreed. The code should be fine but need some comments.

Of course, I'll add some in the next version.

Thanks!