netdev - Re: [PATCH iproute2 1/2] devlink: fix format string warning for 32bit targets

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Message-ID: <20190625115806.01e29659@hermes.lan>
Date:   Tue, 25 Jun 2019 11:58:06 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Baruch Siach <baruch@...s.co.il>
Cc:     Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        Aya Levin <ayal@...lanox.com>,
        Moshe Shemesh <moshe@...lanox.com>
Subject: Re: [PATCH iproute2 1/2] devlink: fix format string warning for
 32bit targets

On Tue, 25 Jun 2019 14:49:04 +0300
Baruch Siach <baruch@...s.co.il> wrote:

> diff --git a/devlink/devlink.c b/devlink/devlink.c
> index 436935f88bda..b400fab17578 100644
> --- a/devlink/devlink.c
> +++ b/devlink/devlink.c
> @@ -1726,9 +1726,9 @@ static void pr_out_u64(struct dl *dl, const char *name, uint64_t val)
>  		jsonw_u64_field(dl->jw, name, val);
>  	} else {
>  		if (g_indent_newline)
> -			pr_out("%s %lu", name, val);
> +			pr_out("%s %llu", name, val);
>  		else
> -			pr_out(" %s %lu", name, val);
> +			pr_out(" %s %llu", name, val);

But on 64 bit target %llu expects unsigned long long which is 128bit.

The better way to fix this is to use:
#include <inttypes.h>

And the use the macro PRIu64
			pr_out(" %s %"PRIu64, name, val);