commit b4138c7180724f2ce08a3376eb59367e189324f3
author Michael Moese <mmoese@suse.de> Fri Mar 09 13:44:16 2018 +0100
committer Cyril Hrubis <chrubis@suse.cz> Tue Mar 13 13:05:26 2018 +0100
tree f0808f837744add9b1d7309c5d421516f39524d8
parent 9c8017cee0c3ddc625897e97a165cf96a135b607

Add library support for /proc/sys/kernel/tainted

Sometimes, it is important to detect if the kernel has issued a
warning, died, or is tainted in another way. Linux provides this
information in /proc/sys/kernel/tainted in the form of a bitfield.
This patch provides library functions for testcases to detect, if
it has tainted the kernel.

The following functions will be introduced:

- int tst_taint_init(unsigned int mask)
  check if the flags supplied as mask are supported by the running
  kernel, and if so, if they are not yet set.

- int tst_taint_check()
  check if one or more of the bits specified in the mask provided
  to tst_taint_init() before are set.
  Returns 0 if those flags are not set, or the bitmask of set flags

These can be used in the following way:

First, during testcase setup:

void setup(void)
{
	...
	tst_taint_init(TST_TAINT_W | TST_TAINT_D);
}

Second, check if the test triggered a bug:

void run(void)
{
	...
	. test code here
	...
	if (tst_taint_check() != 0)
		tst_res(TFAIL, "kernel has issues");
	else
		tst_res(TPASS, "kernel seems to be fine");
}

Signed-off-by: Michael Moese <mmoese@suse.de>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>