diff mbox series

[v2,1/2] selftests: mm: ksm: Fix incorrect evaluation of parameter

Message ID 20230728163952.4634-1-ayush.jain3@amd.com
State New
Headers
Series [v2,1/2] selftests: mm: ksm: Fix incorrect evaluation of parameter |

Commit Message

Ayush Jain July 28, 2023, 4:39 p.m. UTC 
  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@amd.com>
Reviewed-by: David Hildenbrand <david@redhat.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(+)

Comments

Stefan Roesch Aug. 8, 2023, 5:31 p.m. UTC | #1 
Ayush Jain <ayush.jain3@amd.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@amd.com>
> Reviewed-by: David Hildenbrand <david@redhat.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@devkernel.io>
diff mbox series

Patch

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);