linux-kernel - Re: [PATCH 6/7] lib/bitmap.c: fix remaining space computation in bitmap_print_to

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Date:   Mon, 20 Aug 2018 09:36:01 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] lib/bitmap.c: fix remaining space computation in
 bitmap_print_to_pagebuf

On 2018-08-19 14:37, Andy Shevchenko wrote:
> On Sat, Aug 18, 2018 at 4:17 PM Rasmus Villemoes
> <linux@...musvillemoes.dk> wrote:
>>
>>  int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp,
>>                             int nmaskbits)
>>  {
>> -       ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
>> +       ptrdiff_t len = PAGE_SIZE - ((unsigned long)buf & (PAGE_SIZE-1));
> 
> Don't we have offset_in_page() helper macro?

Indeed, thanks! Andrew, if you pick this up, can you use the much more
obvious

PAGE_SIZE - offset_in_page(buf)

instead? bitmap.c already (unsurprisingly) includes mm.h through some
recursive path.

Rasmus