[LTP] rfim: add new test for verifying RFIM sysfs interface

[linuxtestproject.agent@gmail.com]

Hi Piotr,

On Tue, 16 Jun 2026, Piotr Kubaj wrote:
> rfim: add new test for verifying RFIM sysfs interface

> /*\
>  * Validate presence and permissions of RFIM attributes.
>  * The test checks first validity of general RFIM attributes,
>  * and then checks either DLVR or FIVR, depending on hardware.
>  */

The test sets .needs_root = 1 but the doc comment does not explain
why root is required. Other tests in the same directory document
this (e.g. "The test needs root because reading /dev/cpu/N/msr
needs CAP_SYS_RAWIO / root."). Could a line be added explaining
that root is needed for write-access checks on sysfs attributes?

> } else if (!stat(RFIM_ROOT"/fivr", &stats)) {
> 	if (S_ISDIR(stats.st_mode))
> 		variant = RFIM_FIVR;
> 	else
> 		tst_brk(TBROK, "%s exists but is not a directory", RFIM_ROOT"/fivr");
> } else
> 	tst_brk(TCONF, "Neither %s nor %s exists", RFIM_ROOT"/dlvr", RFIM_ROOT"/fivr");

The first two branches of this if/else-if/else chain use braces but
the final else does not. Kernel coding style requires braces on all
branches when any branch needs them.

Verdict - Needs revision

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