netdev - Re: [PATCH] net: rxrpc: fix clang -Wformat warning

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Date:   Thu, 07 Jul 2022 16:10:22 -0700
From:   Joe Perches <joe@...ches.com>
To:     Justin Stitt <justinstitt@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-afs@...ts.infradead.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] net: rxrpc: fix clang -Wformat warning

On Wed, 2022-07-06 at 16:56 -0700, Justin Stitt wrote:
> When building with Clang we encounter this warning:
> > net/rxrpc/rxkad.c:434:33: error: format specifies type 'unsigned short'
> > but the argument has type 'u32' (aka 'unsigned int') [-Werror,-Wformat]
> > _leave(" = %d [set %hx]", ret, y);

Does anyone still use these debugging macros in rxrpc or
is it historic cruft?

net/rxrpc/ar-internal.h-#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
net/rxrpc/ar-internal.h-#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
net/rxrpc/ar-internal.h-#define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
net/rxrpc/ar-internal.h-#define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
net/rxrpc/ar-internal.h-#define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)

etc...

[]

net/rxrpc/Kconfig:config AF_RXRPC_DEBUG
net/rxrpc/Kconfig-      bool "RxRPC dynamic debugging"
net/rxrpc/Kconfig-      help
net/rxrpc/Kconfig-        Say Y here to make runtime controllable debugging messages appear.
net/rxrpc/Kconfig-
net/rxrpc/Kconfig-        See Documentation/networking/rxrpc.rst

This seems to show there is debugging documentation, but it
doesn't seem to exist in this file.

> diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
[]
> @@ -431,7 +431,7 @@ static int rxkad_secure_packet(struct rxrpc_call *call,
>  		break;
>  	}
>  
> -	_leave(" = %d [set %hx]", ret, y);
> +	_leave(" = %d [set %u]", ret, y);
>  	return ret;
>  }
>