linux-kernel - Re: [PATCH v9] mmc: Export host capabilities to debugfs.

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Date:   Mon, 12 Mar 2018 16:22:30 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Harish Jenny K N <harish_kandiga@...tor.com>,
        Avri Altman <Avri.Altman@....com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "shawn.lin@...k-chips.com" <shawn.lin@...k-chips.com>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Vladimir_Zapolskiy@...tor.com" <Vladimir_Zapolskiy@...tor.com>
Subject: Re: [PATCH v9] mmc: Export host capabilities to debugfs.

On Mon, 2018-03-12 at 19:04 +0530, Harish Jenny K N wrote:
> 
> On Monday 12 March 2018 06:33 PM, Andy Shevchenko wrote:
> > On Mon, 2018-03-12 at 18:00 +0530, Harish Jenny K N wrote:

> > > > > > > > +	for_each_set_bit(bit, (const unsigned long
> > > > > > > > *)&caps,
> > > > > > > > BITS_PER_LONG)
> > > > > > > > +	for_each_set_bit(bit, (const unsigned long
> > > > > > > > *)&caps2,
> > > > > > > > BITS_PER_LONG)
> > > > > > > 
> > > > > > > Explicit casting is not needed anymore in both cases.

> Sorry for I was not clear that the compilation error is for the
> following case
> > u32 caps = host->caps;
> > for_each_set_bit(bit, &caps, ARRAY_SIZE(mmc_host_capabilities))
> 
> 
> example: compilation for arm gives this error for the following lines:
> 
> drivers/mmc/core/debugfs.c: In function 'mmc_caps_show':
> ./include/linux/bitops.h:41:30: error: passing argument 1 of
> '_find_first_bit_le' from incompatible pointer type [-
> Werror=incompatible-pointer-types]
>   for ((bit) = find_first_bit((addr), (size));  \
>                               ^
> ./arch/arm/include/asm/bitops.h:202:50: note: in definition of macro
> 'find_first_bit'
>  #define find_first_bit(p,sz)  _find_first_bit_le(p,sz)
>                                                   ^
> drivers/mmc/core/debugfs.c:318:2: note: in expansion of macro
> 'for_each_set_bit'
>   for_each_set_bit(bit, &caps, ARRAY_SIZE(mmc_host_capabilities))
>   ^
> ./arch/arm/include/asm/bitops.h:165:12: note: expected 'const long
> unsigned int *' but argument is of type 'u32 * {aka unsigned int *}'
>  extern int _find_first_bit_le(const unsigned long *p, unsigned size);
>             ^

Are you sure you have caps defined as unsigned long?

Check your code, the explicit casting should gone. Otherwise you are
doing something wrong.

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy