linux-kernel - Re: [PATCH v3 1/2] drm: Fix fault format

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Message-Id: <5b52dfcf-7b4c-4715-b1b2-6e41062302bd@app.fastmail.com>
Date: Fri, 04 Oct 2024 13:21:08 +0000
From: "Arnd Bergmann" <arnd@...db.de>
To: "Vincenzo Frascino" <vincenzo.frascino@....com>,
 linux-kernel@...r.kernel.org, Linux-Arch <linux-arch@...r.kernel.org>,
 linux-mm@...ck.org
Cc: "Andy Lutomirski" <luto@...nel.org>,
 "Thomas Gleixner" <tglx@...utronix.de>,
 "Jason A . Donenfeld" <Jason@...c4.com>,
 "Christophe Leroy" <christophe.leroy@...roup.eu>,
 "Michael Ellerman" <mpe@...erman.id.au>,
 "Nicholas Piggin" <npiggin@...il.com>, "Naveen N Rao" <naveen@...nel.org>,
 "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
 "Dave Hansen" <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>, "Theodore Ts'o" <tytso@....edu>,
 "Andrew Morton" <akpm@...ux-foundation.org>,
 "Steven Rostedt" <rostedt@...dmis.org>,
 "Masami Hiramatsu" <mhiramat@...nel.org>,
 "Mathieu Desnoyers" <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH v3 1/2] drm: Fix fault format

On Thu, Oct 3, 2024, at 15:29, Vincenzo Frascino wrote:
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c 
> b/drivers/gpu/drm/i915/gt/intel_gt.c
> index a6c69a706fd7..352ef5e1c615 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -308,7 +308,7 @@ static void gen6_check_faults(struct intel_gt *gt)
>  		fault = GEN6_RING_FAULT_REG_READ(engine);
>  		if (fault & RING_FAULT_VALID) {
>  			gt_dbg(gt, "Unexpected fault\n"
> -			       "\tAddr: 0x%08lx\n"
> +			       "\tAddr: 0x%08x\n"
>  			       "\tAddress space: %s\n"
>  			       "\tSource ID: %d\n"
>  			       "\tType: %d\n",

Isn't the type of PAGE_MASK still architecture dependent?
I think you need a cast to either 'int' or 'long' here to
make the corresponding format string work across all
architectures. With the current version of your patch 2/2,
it looks like it has to be %x for architectures with 
64-bit phys_addr_t, but %lx for the other ones.

Changing the 'u32 fault' variable to 'unsigned long'
would also work here.

      Arnd