linux-kernel - Re: [PATCH v3 1/3] lib: bitmap: introduce bitmap_print_to

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Date:   Thu, 3 Jun 2021 14:11:16 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "tiantao (H)" <tiantao6@...wei.com>
Cc:     Tian Tao <tiantao6@...ilicon.com>, gregkh@...uxfoundation.org,
        rafael@...nel.org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, jonathan.cameron@...wei.com,
        song.bao.hua@...ilicon.com, Randy Dunlap <rdunlap@...radead.org>,
        Stefano Brivio <sbrivio@...hat.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        "Ma, Jianpeng" <jianpeng.ma@...el.com>,
        Yury Norov <yury.norov@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH v3 1/3] lib: bitmap: introduce bitmap_print_to_buf

On Thu, Jun 03, 2021 at 06:33:25PM +0800, tiantao (H) wrote:
> 在 2021/6/3 17:50, Andy Shevchenko 写道:
> > On Thu, Jun 03, 2021 at 05:22:40PM +0800, Tian Tao wrote:
> > > New API bitmap_print_to_buf() with bin_attribute to avoid maskp
> > > exceeding PAGE_SIZE. bitmap_print_to_pagebuf() is a special case
> > > of bitmap_print_to_buf(), so in bitmap_print_to_pagebuf() call
> > > bitmap_print_to_buf().

...

> > > + * @count: the maximum number of bytes to print

> > > +	size = memory_read_from_buffer(buf, count, &off, data, strlen(data) + 1);
> > Are you sure you have put parameters in the correct order?
> 
> yes, I already test it.
> 
> ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
>                                 const void *from, size_t available)

Have you read the meaning of count and available?
Please, double check that they are filled with correct values.

> > I guess you have to provide the test case(s).

-- 
With Best Regards,
Andy Shevchenko