[LTP] [PATCH v5 4/4] umip_basic_test.c: improve kconfig verification to avoid umip wrong abort case

[Petr Vorel <pvorel@suse.cz>]

Hi Xu,

> From v5.5 main line, umip kconfig changed from "CONFIG_X86_INTEL_UMIP=y"
> to "CONFIG_X86_UMIP=y".
> We could use "CONFIG_X86_INTEL_UMIP|CONFIG_X86_UMIP=y" to check kconfig
> CONFIG_X86_INTEL_UMIP=y(old kernel) or CONFIG_X86_UMIP=y(new kernel) for umip.

> Signed-off-by: Pengfei Xu <pengfei.xu@intel.com>
> ---
>  testcases/kernel/security/umip/umip_basic_test.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

> diff --git a/testcases/kernel/security/umip/umip_basic_test.c b/testcases/kernel/security/umip/umip_basic_test.c
> index 1baa26c52..24eca8890 100644
> --- a/testcases/kernel/security/umip/umip_basic_test.c
> +++ b/testcases/kernel/security/umip/umip_basic_test.c
> @@ -171,7 +171,7 @@ static struct tst_test test = {
>  	.forks_child = 1,
>  	.test = verify_umip_instruction,
>  	.needs_kconfigs = (const char *[]){
> -		"CONFIG_X86_INTEL_UMIP=y",
> +		"CONFIG_X86_INTEL_UMIP|CONFIG_X86_UMIP=y",

We're sorry to get to your patch now, after 5 months.

Thanks for a report and your effort to fix the problem. But this does not work,
because current implementation does not support '|' as bitwise or, with this
patch will result on tests being skipped for both cases.

While it'd be easy to implement support for bitwise or in tst_kconfig_read(),
it might be enough just to check for kernel version:

.needs_kconfigs = (const char *[]){
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 5, 0)
	"CONFIG_X86_INTEL_UMIP=y",
#else
	"CONFIG_X86_UMIP=y",
#endif

But that will work unless this feature is not backported (IMHO commit
b971880fe79f ("x86/Kconfig: Rename UMIP config parameter") is kind of cleanup,
therefore unlikely to be backported, but it can happen).

Kind regards,
Petr