From: Chris Wilson Date: Tue, 17 Oct 2017 11:37:23 +0100 Subject: drm/i915/selftests: Silence the compiler for impossible errors Git-commit: 134649ff3545f3b7b862c589e9accb400ace2474 Patch-mainline: v4.15-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 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 Cc: Matthew Auld Link: https://patchwork.freedesktop.org/patch/msgid/20171017103723.6933-1-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld Acked-by: Petr Tesarik --- drivers/gpu/drm/i915/selftests/huge_pages.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- 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 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 * 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 --