linux-kernel - Re: [PATCH v12 06/22] selftests/vm: fix the wrong assert in pkey_disable

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Date:   Fri, 16 Mar 2018 15:06:44 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Ram Pai <linuxram@...ibm.com>, shuahkh@....samsung.com,
        linux-kselftest@...r.kernel.org
Cc:     mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, akpm@...ux-foundation.org,
        benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, hbabu@...ibm.com, mhocko@...nel.org,
        bauerman@...ux.vnet.ibm.com, ebiederm@...ssion.com, arnd@...db.de
Subject: Re: [PATCH v12 06/22] selftests/vm: fix the wrong assert in
 pkey_disable_set()

On 02/21/2018 05:55 PM, Ram Pai wrote:
> If the flag is 0, no bits will be set. Hence we cant expect
> the resulting bitmap to have a higher value than what it
> was earlier.
> 
> cc: Dave Hansen <dave.hansen@...el.com>
> cc: Florian Weimer <fweimer@...hat.com>
> Signed-off-by: Ram Pai <linuxram@...ibm.com>
> ---
>  tools/testing/selftests/vm/protection_keys.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
> index 83216c5..0109388 100644
> --- a/tools/testing/selftests/vm/protection_keys.c
> +++ b/tools/testing/selftests/vm/protection_keys.c
> @@ -443,7 +443,7 @@ void pkey_disable_set(int pkey, int flags)
>  	dprintf1("%s(%d) pkey_reg: 0x%lx\n",
>  		__func__, pkey, rdpkey_reg());
>  	if (flags)
> -		pkey_assert(rdpkey_reg() > orig_pkey_reg);
> +		pkey_assert(rdpkey_reg() >= orig_pkey_reg);
>  	dprintf1("END<---%s(%d, 0x%x)\n", __func__,
>  		pkey, flags);
>  }

I'm not sure about this one.  Did this cause a problem for you?

Why would you call this and ask no bits to be set?