drm/i915/selftests: Silence the compiler for impossible errors

It should be impossible for these tests not to run due to an empty
ppgtt, but if it should happen, let's report ENODEV (our typical
internal error for impossible events).

In file included from drivers/gpu/drm/i915/i915_gem.c:5415:
   drivers/gpu/drm/i915/selftests/huge_pages.c: In function 'igt_mock_ppgtt_huge_fill':
>> drivers/gpu/drm/i915/selftests/huge_pages.c:612: error: 'err' may be used uninitialized in this function
   drivers/gpu/drm/i915/selftests/huge_pages.c: In function 'igt_ppgtt_exhaust_huge':
   drivers/gpu/drm/i915/selftests/huge_pages.c:1159: error: 'err' may be used uninitialized in this function

Reported-by: kbuild-all@01.org
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171017103723.6933-1-chris@chris-wilson.co.uk
Reviewed-by: Matthew Auld <matthew.auld@intel.com>

diff --git a/drivers/gpu/drm/i915/selftests/huge_pages.c b/drivers/gpu/drm/i915/selftests/huge_pages.c
index c53f8474113a781b14d460d670d0f055b870b3e2..5cc8101bb2b1a05f92296fc972e93ffef48921cb 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/selftests/huge_pages.c
@@ -609,7 +609,7 @@ static int igt_mock_ppgtt_huge_fill(void *arg)
        bool single = false;
        LIST_HEAD(objects);
        IGT_TIMEOUT(end_time);
-       int err;
+       int err = -ENODEV;
 
        for_each_prime_number_from(page_num, 1, max_pages) {
                struct drm_i915_gem_object *obj;
@@ -1157,7 +1157,7 @@ static int igt_ppgtt_exhaust_huge(void *arg)
        unsigned int size_mask;
        unsigned int page_mask;
        int n, i;
-       int err;
+       int err = -ENODEV;
 
        /*
         * Sanity check creating objects with a varying mix of page sizes --