linux-kernel - Re: [PATCH 1/5] perf: unwind: fix unw_word

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Date:	Sat, 10 Oct 2015 17:49:40 +0200
From:	Rabin Vincent <rabin@....in>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] perf: unwind: fix unw_word_t pointer casts

Hi Arnaldo,

Do you have any comments on this patch set?

Thanks.

On Sun, Sep 27, 2015 at 08:37:55PM +0200, Rabin Vincent wrote:
> unw_word_t is uint64_t even on 32-bit MIPS.  Cast it to uintptr_t before
> the cast to void *p to get rid of the following errors:
> 
> util/unwind-libunwind.c: In function 'access_mem':
> util/unwind-libunwind.c:464:4: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> util/unwind-libunwind.c:475:2: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> cc1: all warnings being treated as errors
> make[3]: *** [util/unwind-libunwind.o] Error 1
> 
> Signed-off-by: Rabin Vincent <rabin.vincent@...s.com>
> ---
>  tools/perf/util/unwind-libunwind.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
> index 4c00507..ef799dc 100644
> --- a/tools/perf/util/unwind-libunwind.c
> +++ b/tools/perf/util/unwind-libunwind.c
> @@ -461,7 +461,7 @@ static int access_mem(unw_addr_space_t __maybe_unused as,
>  		if (ret) {
>  			pr_debug("unwind: access_mem %p not inside range"
>  				 " 0x%" PRIx64 "-0x%" PRIx64 "\n",
> -				 (void *) addr, start, end);
> +				 (void *) (uintptr_t) addr, start, end);
>  			*valp = 0;
>  			return ret;
>  		}
> @@ -471,7 +471,7 @@ static int access_mem(unw_addr_space_t __maybe_unused as,
>  	offset = addr - start;
>  	*valp  = *(unw_word_t *)&stack->data[offset];
>  	pr_debug("unwind: access_mem addr %p val %lx, offset %d\n",
> -		 (void *) addr, (unsigned long)*valp, offset);
> +		 (void *) (uintptr_t) addr, (unsigned long)*valp, offset);
>  	return 0;
>  }
>  
> -- 
> 1.7.10.4
> 
> --
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