linux-kernel - Re: [PATCH v2 1/2] selftests: mm: ksm: Fix incorrect evaluation of parameter

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Date:   Tue, 08 Aug 2023 10:31:24 -0700
From:   Stefan Roesch <shr@...kernel.io>
To:     Ayush Jain <ayush.jain3@....com>
Cc:     akpm@...ux-foundation.org, shuah@...nel.org,
        pasha.tatashin@...een.com, zhansayabagdaulet@...il.com,
        tyhicks@...ux.microsoft.com, raghavendra.kt@....com,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Narasimhan.V@....com,
        Santosh.Shukla@....com, David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v2 1/2] selftests: mm: ksm: Fix incorrect evaluation of
 parameter


Ayush Jain <ayush.jain3@....com> writes:

> A missing break in kms_tests leads to kselftest hang when the
> parameter -s is used.
> In current code flow because of missing break in -s, -t parses
> args spilled from -s and as -t accepts only valid values as 0,1
> so any arg in -s >1 or <0, gets in ksm_test failure
>
> This went undetected since, before the addition of option -t,
> the next case -M would immediately break out of the switch
> statement but that is no longer the case
>
> Add the missing break statement.
>
> ----Before----
> ./ksm_tests -H -s 100
> Invalid merge type
>
> ----After----
> ./ksm_tests -H -s 100
> Number of normal pages:    0
> Number of huge pages:    50
> Total size:    100 MiB
> Total time:    0.401732682 s
> Average speed:  248.922 MiB/s
>
> Fixes: 07115fcc15b4 ("selftests/mm: add new selftests for KSM")
>
> Signed-off-by: Ayush Jain <ayush.jain3@....com>
> Reviewed-by: David Hildenbrand <david@...hat.com>
> ---
> v1 -> v2
> collect Reviewed-by from David
> Updated Fixes tag from commit 9e7cb94ca218 to 07115fcc15b4
>
>  tools/testing/selftests/mm/ksm_tests.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c
> index 435acebdc325..380b691d3eb9 100644
> --- a/tools/testing/selftests/mm/ksm_tests.c
> +++ b/tools/testing/selftests/mm/ksm_tests.c
> @@ -831,6 +831,7 @@ int main(int argc, char *argv[])
>  				printf("Size must be greater than 0\n");
>  				return KSFT_FAIL;
>  			}
> +			break;
>  		case 't':
>  			{
>  				int tmp = atoi(optarg);

Acked-by: Stefan Roesch <shr@...kernel.io>