tree: https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git vht-he head: fb4566483cf87f72333e1a3f65d99d9a24227b10 commit: 944d0b05ebf7bf2ae2cc4b7184e86d7cd3a9f18b [7/14] ieee80211: add new VHT capability fields/parsing config: x86_64-randconfig-x009-201707 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout 944d0b05ebf7bf2ae2cc4b7184e86d7cd3a9f18b # 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 >>): net/wireless/util.c: In function 'ieee80211_get_vht_max_nss': >> net/wireless/util.c:1948:13: warning: 'max_vht_nss' may be used uninitialized in this function [-Wmaybe-uninitialized] return 2 * max_vht_nss; ~~^~~~~~~~~~~~~ vim +/max_vht_nss +1948 net/wireless/util.c 1932 switch (bw) { 1933 case IEEE80211_VHT_CHANWIDTH_USE_HT: 1934 case IEEE80211_VHT_CHANWIDTH_80MHZ: 1935 if ((supp_width == 1 || supp_width == 2) && 1936 ext_nss_bw == 3) 1937 return 2 * max_vht_nss; 1938 break; 1939 case IEEE80211_VHT_CHANWIDTH_160MHZ: 1940 if (supp_width == 0 && 1941 (ext_nss_bw == 1 || ext_nss_bw == 2)) 1942 return DIV_ROUND_UP(max_vht_nss, 2); 1943 if (supp_width == 0 && 1944 ext_nss_bw == 3) 1945 return DIV_ROUND_UP(3 * max_vht_nss, 4); 1946 if (supp_width == 1 && 1947 ext_nss_bw == 3) > 1948 return 2 * max_vht_nss; 1949 break; 1950 case IEEE80211_VHT_CHANWIDTH_80P80MHZ: 1951 if (supp_width == 0 && 1952 ext_nss_bw == 2) 1953 return DIV_ROUND_UP(max_vht_nss, 2); 1954 if (supp_width == 0 && 1955 ext_nss_bw == 3) 1956 return DIV_ROUND_UP(3 * max_vht_nss, 4); --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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