Re: [PATCH bpf-next] libbpf: fix ptr to u64 conversion warning on 32-bit platforms

[Yonghong Song <yhs@fb.com>]

On 7/8/19 9:00 PM, Andrii Nakryiko wrote:
> On 32-bit platforms compiler complains about conversion:
> 
> libbpf.c: In function ‘perf_event_open_probe’:
> libbpf.c:4112:17: error: cast from pointer to integer of different
> size [-Werror=pointer-to-int-cast]
>    attr.config1 = (uint64_t)(void *)name; /* kprobe_func or uprobe_path */
>                   ^
> 
> Reported-by: Matt Hart <matthew.hart@linaro.org>
> Fixes: b26500274767 ("libbpf: add kprobe/uprobe attach API")
> Tested-by: Matt Hart <matthew.hart@linaro.org>
> Signed-off-by: Andrii Nakryiko <andriin@fb.com>

Acked-by: Yonghong Song <yhs@fb.com>

> ---
>   tools/lib/bpf/libbpf.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index ed07789b3e62..794dd5064ae8 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -4126,8 +4126,8 @@ static int perf_event_open_probe(bool uprobe, bool retprobe, const char *name,
>   	}
>   	attr.size = sizeof(attr);
>   	attr.type = type;
> -	attr.config1 = (uint64_t)(void *)name; /* kprobe_func or uprobe_path */
> -	attr.config2 = offset;		       /* kprobe_addr or probe_offset */
> +	attr.config1 = ptr_to_u64(name); /* kprobe_func or uprobe_path */
> +	attr.config2 = offset;		 /* kprobe_addr or probe_offset */
>   
>   	/* pid filter is meaningful only for uprobes */
>   	pfd = syscall(__NR_perf_event_open, &attr,
>