[alsa-devel] [PATCH 7/9] ASoC: Silence DEBUG_STRICT_USER_COPY_CHECKS=y warning

[Liam Girdwood]

On Thu, 2011-05-12 at 16:50 -0700, Stephen Boyd wrote:
> Enabling DEBUG_STRICT_USER_COPY_CHECKS causes the following
> warning:
> 
> In file included from arch/x86/include/asm/uaccess.h:573,
>                  from include/linux/poll.h:14,
>                  from include/sound/pcm.h:29,
>                  from include/sound/ac97_codec.h:31,
>                  from sound/soc/soc-core.c:34:
> In function 'copy_from_user',
>     inlined from 'codec_reg_write_file' at
>     sound/soc/soc-core.c:252:
> arch/x86/include/asm/uaccess_64.h:65:
> warning: call to 'copy_from_user_overflow' declared with
> attribute warning: copy_from_user() buffer size is not provably
> correct
> 
> presumably due to buf_size being signed causing GCC to fail to
> see that buf_size can't become negative.
> 
> Cc: Liam Girdwood <lrg at slimlogic.co.uk>
> Cc: Mark Brown <broonie at opensource.wolfsonmicro.com>
> Signed-off-by: Stephen Boyd <sboyd at codeaurora.org>

Acked-by: Liam Girdwood <lrg at ti.com>