Hi, [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on next-20160420] [cannot apply to v4.6-rc4] [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/Matt-Roper/Pre-calculate-SKL-style-atomic-watermarks/20160420-102913 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: x86_64-randconfig-n0-04210735 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/gpu/drm/i915/intel_pm.c: In function 'skl_compute_wm': >> drivers/gpu/drm/i915/intel_pm.c:2903:5: warning: 'num_active' may be used uninitialized in this function [-Wmaybe-uninitialized] if (num_active == 1) ^ drivers/gpu/drm/i915/intel_pm.c:3057:6: note: 'num_active' was declared here int num_active; ^ vim +/num_active +2903 drivers/gpu/drm/i915/intel_pm.c 000bcc21 Matt Roper 2016-04-19 2887 if (!intel_state->active_pipe_changes) { 000bcc21 Matt Roper 2016-04-19 2888 *alloc = dev_priv->wm.skl_hw.ddb.pipe[pipe]; 000bcc21 Matt Roper 2016-04-19 2889 *num_active = hweight32(dev_priv->active_crtcs); 000bcc21 Matt Roper 2016-04-19 2890 return; 000bcc21 Matt Roper 2016-04-19 2891 } 000bcc21 Matt Roper 2016-04-19 2892 000bcc21 Matt Roper 2016-04-19 2893 *num_active = hweight32(intel_state->active_crtcs); 000bcc21 Matt Roper 2016-04-19 2894 nth_active_pipe = hweight32(intel_state->active_crtcs & 000bcc21 Matt Roper 2016-04-19 2895 (drm_crtc_mask(for_crtc) - 1)); 000bcc21 Matt Roper 2016-04-19 2896 pipe_size = ddb_size / hweight32(intel_state->active_crtcs); 000bcc21 Matt Roper 2016-04-19 2897 alloc->start = nth_active_pipe * ddb_size / *num_active; 000bcc21 Matt Roper 2016-04-19 2898 alloc->end = alloc->start + pipe_size; b9cec075 Damien Lespiau 2014-11-04 2899 } b9cec075 Damien Lespiau 2014-11-04 2900 000bcc21 Matt Roper 2016-04-19 2901 static unsigned int skl_cursor_allocation(int num_active) b9cec075 Damien Lespiau 2014-11-04 2902 { 000bcc21 Matt Roper 2016-04-19 @2903 if (num_active == 1) b9cec075 Damien Lespiau 2014-11-04 2904 return 32; b9cec075 Damien Lespiau 2014-11-04 2905 b9cec075 Damien Lespiau 2014-11-04 2906 return 8; b9cec075 Damien Lespiau 2014-11-04 2907 } b9cec075 Damien Lespiau 2014-11-04 2908 a269c583 Damien Lespiau 2014-11-04 2909 static void skl_ddb_entry_init_from_hw(struct skl_ddb_entry *entry, u32 reg) a269c583 Damien Lespiau 2014-11-04 2910 { a269c583 Damien Lespiau 2014-11-04 2911 entry->start = reg & 0x3ff; :::::: The code at line 2903 was first introduced by commit :::::: 000bcc2112fef02e609ad72f6ae43fd027ce8564 drm/i915/gen9: Allow skl_allocate_pipe_ddb() to operate on in-flight state (v2) :::::: TO: Matt Roper <matthew.d.roper@xxxxxxxxx> :::::: CC: 0day robot <fengguang.wu@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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