linux-kernel - Re: [PATCH v10 27/27] mm: display pkey in smaps if arch_pkeys

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Date:   Tue, 30 Jan 2018 13:16:11 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Ram Pai <linuxram@...ibm.com>
Cc:     mpe@...erman.id.au, mingo@...hat.com, akpm@...ux-foundation.org,
        corbet@....net, arnd@...db.de, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, dave.hansen@...el.com,
        benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, hbabu@...ibm.com,
        bauerman@...ux.vnet.ibm.com, ebiederm@...ssion.com
Subject: Re: [PATCH v10 27/27] mm: display pkey in smaps if
 arch_pkeys_enabled() is true

On Thu 18-01-18 17:50:48, Ram Pai wrote:
[...]
> @@ -851,9 +848,13 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
>  			   (unsigned long)(mss->pss >> (10 + PSS_SHIFT)));
>  
>  	if (!rollup_mode) {
> -		arch_show_smap(m, vma);
> +#ifdef CONFIG_ARCH_HAS_PKEYS
> +		if (arch_pkeys_enabled())
> +			seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));
> +#endif
>  		show_smap_vma_flags(m, vma);
>  	}
> +

Why do you need to add ifdef here? The previous patch should make
arch_pkeys_enabled == F when CONFIG_ARCH_HAS_PKEYS=n. Btw. could you
merge those two patches into one. It is usually much easier to review a
new helper function if it is added along with a user.

>  	m_cache_vma(m, vma);
>  	return ret;
>  }
> -- 
> 1.7.1

-- 
Michal Hocko
SUSE Labs