Hi Tvrtko, [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on v4.5 next-20160323] [if your patch is applied to the wrong git tree, please drop us a note to help improving the system] url: https://github.com/0day-ci/linux/commits/Tvrtko-Ursulin/drm-i915-Replace-some-more-busy-waits-with-normal-ones/20160323-224126 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: x86_64-randconfig-x000-201612 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): In file included from include/uapi/linux/stddef.h:1:0, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/list.h:4, from include/linux/dmi.h:4, from drivers/gpu/drm/i915/intel_display.c:27: drivers/gpu/drm/i915/intel_display.c: In function 'lpt_reset_fdi_mphy': drivers/gpu/drm/i915/intel_display.c:8386:6: error: implicit declaration of function 'wait_for_us' [-Werror=implicit-function-declaration] if (wait_for_us(I915_READ(SOUTH_CHICKEN2) & ^ include/linux/compiler.h:147:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^ >> drivers/gpu/drm/i915/intel_display.c:8386:2: note: in expansion of macro 'if' if (wait_for_us(I915_READ(SOUTH_CHICKEN2) & ^ cc1: some warnings being treated as errors vim +/if +8386 drivers/gpu/drm/i915/intel_display.c 8370 I915_WRITE(PCH_DREF_CONTROL, val); 8371 POSTING_READ(PCH_DREF_CONTROL); 8372 udelay(200); 8373 } 8374 8375 BUG_ON(val != final); 8376 } 8377 8378 static void lpt_reset_fdi_mphy(struct drm_i915_private *dev_priv) 8379 { 8380 uint32_t tmp; 8381 8382 tmp = I915_READ(SOUTH_CHICKEN2); 8383 tmp |= FDI_MPHY_IOSFSB_RESET_CTL; 8384 I915_WRITE(SOUTH_CHICKEN2, tmp); 8385 > 8386 if (wait_for_us(I915_READ(SOUTH_CHICKEN2) & 8387 FDI_MPHY_IOSFSB_RESET_STATUS, 100)) 8388 DRM_ERROR("FDI mPHY reset assert timeout\n"); 8389 8390 tmp = I915_READ(SOUTH_CHICKEN2); 8391 tmp &= ~FDI_MPHY_IOSFSB_RESET_CTL; 8392 I915_WRITE(SOUTH_CHICKEN2, tmp); 8393 8394 if (wait_for_us((I915_READ(SOUTH_CHICKEN2) & --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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