linux-kernel - Re: [PATCH v9 44/51] selftest/vm: powerpc implementation for generic abstraction

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Date:   Thu, 9 Nov 2017 16:47:15 -0200
From:   Breno Leitao <leitao@...ian.org>
To:     Ram Pai <linuxram@...ibm.com>
Cc:     mpe@...erman.id.au, mingo@...hat.com, akpm@...ux-foundation.org,
        corbet@....net, arnd@...db.de, linux-arch@...r.kernel.org,
        ebiederm@...ssion.com, linux-doc@...r.kernel.org, x86@...nel.org,
        dave.hansen@...el.com, linux-kernel@...r.kernel.org,
        mhocko@...nel.org, linux-mm@...ck.org, paulus@...ba.org,
        aneesh.kumar@...ux.vnet.ibm.com, linux-kselftest@...r.kernel.org,
        bauerman@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        khandual@...ux.vnet.ibm.com
Subject: Re: [PATCH v9 44/51] selftest/vm: powerpc implementation for generic
 abstraction

Hi Ram,

On Mon, Nov 06, 2017 at 12:57:36AM -0800, Ram Pai wrote:
> @@ -206,12 +209,14 @@ void signal_handler(int signum, siginfo_t *si, void *vucontext)
>  
>  	trapno = uctxt->uc_mcontext.gregs[REG_TRAPNO];
>  	ip = uctxt->uc_mcontext.gregs[REG_IP_IDX];
> -	fpregset = uctxt->uc_mcontext.fpregs;
> -	fpregs = (void *)fpregset;

Since you removed all references for fpregset now, you probably want to
remove the declaration of the variable above.

> @@ -219,20 +224,21 @@ void signal_handler(int signum, siginfo_t *si, void *vucontext)
>  	 * state.  We just assume that it is here.
>  	 */
>  	fpregs += 0x70;
> -#endif
> -	pkey_reg_offset = pkey_reg_xstate_offset();

With this code, you removed all the reference for variable
pkey_reg_offset, thus, its declaration could be removed also.

> -	*(u64 *)pkey_reg_ptr = 0x00000000;
> +	dprintf1("si_pkey from siginfo: %lx\n", si_pkey);
> +#if defined(__i386__) || defined(__x86_64__) /* arch */
> +	dprintf1("signal pkey_reg from xsave: %016lx\n", *pkey_reg_ptr);
> +	*(u64 *)pkey_reg_ptr &= reset_bits(si_pkey, PKEY_DISABLE_ACCESS);
> +#elif __powerpc64__

Since the variable pkey_reg_ptr is only used for Intel code (inside
#ifdefs), you probably want to #ifdef the variable declaration also,
avoid triggering "unused variable" warning on non-Intel machines.