linux-kernel - Re: [PATCH v2 1/6] ia64, processor: fix -Wincompatible-pointer-types in ia64_get

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Message-ID: <YqlLJ2IHAIn4kv8Z@yury-laptop>
Date:   Tue, 14 Jun 2022 19:59:51 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Matt Turner <mattst88@...il.com>,
        Brian Cain <bcain@...cinc.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Marco Elver <elver@...gle.com>, Borislav Petkov <bp@...e.de>,
        Tony Luck <tony.luck@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-alpha@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2 1/6] ia64, processor: fix -Wincompatible-pointer-types
 in ia64_get_irr()

On Fri, Jun 10, 2022 at 01:34:22PM +0200, Alexander Lobakin wrote:
> test_bit(), as any other bitmap op, takes `unsigned long *` as a
> second argument (pointer to the actual bitmap), as any bitmap
> itself is an array of unsigned longs. However, the ia64_get_irr()
> code passes a ref to `u64` as a second argument.
> This works with the ia64 bitops implementation due to that they
> have `void *` as the second argument and then cast it later on.
> This works with the bitmap API itself due to that `unsigned long`
> has the same size on ia64 as `u64` (`unsigned long long`), but
> from the compiler PoV those two are different.
> Define @irr as `unsigned long` to fix that. That implies no
> functional changes. Has been hidden for 16 years!
> 
> Fixes: a58786917ce2 ("[IA64] avoid broken SAL_CACHE_FLUSH implementations")
> Cc: stable@...r.kernel.org # 2.6.16+
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>

Reviewed-by: Yury Norov <yury.norov@...il.com>

> ---
>  arch/ia64/include/asm/processor.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
> index 7cbce290f4e5..757c2f6d8d4b 100644
> --- a/arch/ia64/include/asm/processor.h
> +++ b/arch/ia64/include/asm/processor.h
> @@ -538,7 +538,7 @@ ia64_get_irr(unsigned int vector)
>  {
>  	unsigned int reg = vector / 64;
>  	unsigned int bit = vector % 64;
> -	u64 irr;
> +	unsigned long irr;
>  
>  	switch (reg) {
>  	case 0: irr = ia64_getreg(_IA64_REG_CR_IRR0); break;
> -- 
> 2.36.1