tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 7b4cb0a48db03a67d1ce21c4f97b1508a241a2e7 commit: 3f84adfe1d7ae9c72f02a4f28d3381c678878a3d [1191/12611] staging: wfx: remove hack about tx_rate policies config: parisc-randconfig-r036-20200526 (attached as .config) compiler: hppa64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 3f84adfe1d7ae9c72f02a4f28d3381c678878a3d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/mm.h:95, from include/linux/bvec.h:13, from include/linux/skbuff.h:17, from include/linux/if_ether.h:19, from include/net/mac80211.h:18, from drivers/staging/wfx/data_tx.c:8: include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full': arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 96 | pte_t old_pte; | ^~~~~~~ arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at' 322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0)) | ^~~~~~~~~~ include/asm-generic/pgtable.h:202:2: note: in expansion of macro 'pte_clear' 202 | pte_clear(mm, address, ptep); | ^~~~~~~~~ include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit': arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 96 | pte_t old_pte; | ^~~~~~~ include/asm-generic/pgtable.h:641:2: note: in expansion of macro 'set_pte_at' 641 | set_pte_at(vma->vm_mm, addr, ptep, pte); | ^~~~~~~~~~ drivers/staging/wfx/data_tx.c: In function 'wfx_tx_policy_build': 45 | size_t count; | ^~~~~ vim +/count +45 drivers/staging/wfx/data_tx.c 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 40 fcd6c0f9a12369a Jérôme Pouiller 2019-10-08 41 static void wfx_tx_policy_build(struct wfx_vif *wvif, struct tx_policy *policy, 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 42 struct ieee80211_tx_rate *rates) 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 43 { 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 44 int i; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 @45 size_t count; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 46 struct wfx_dev *wdev = wvif->wdev; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 47 b5be2aa3b3ac153 Jérôme Pouiller 2019-10-08 48 WARN(rates[0].idx < 0, "invalid rate policy"); 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 49 memset(policy, 0, sizeof(*policy)); 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 50 for (i = 1; i < IEEE80211_TX_MAX_RATES; i++) 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 51 if (rates[i].idx < 0) 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 52 break; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 53 count = i; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 54 for (i = 0; i < IEEE80211_TX_MAX_RATES; ++i) { 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 55 int rateid; 5cd382b2693358b Jules Irenge 2019-11-11 56 u8 count; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 57 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 58 if (rates[i].idx < 0) 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 59 break; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 60 WARN_ON(rates[i].count > 15); 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 61 rateid = wfx_get_hw_rate(wdev, &rates[i]); 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 62 // Pack two values in each byte of policy->rates 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 63 count = rates[i].count; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 64 if (rateid % 2) 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 65 count <<= 4; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 66 policy->rates[rateid / 2] |= count; 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 67 } 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 68 } 9bca45f3d6924f1 Jérôme Pouiller 2019-09-19 69 :::::: The code at line 45 was first introduced by commit :::::: 9bca45f3d6924f19f29c0d019e961af3f41bdc9e staging: wfx: allow to send 802.11 frames :::::: TO: Jérôme Pouiller <jerome.pouiller(a)silabs.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org