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: xtensa-allmodconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 4.9.0 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 944d0b05ebf7bf2ae2cc4b7184e86d7cd3a9f18b # save the attached .config to linux build tree make.cross ARCH=xtensa 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 >>): In file included from include/linux/cache.h:4:0, from include/linux/printk.h:8, from include/linux/kernel.h:13, from include/linux/skbuff.h:17, from include/linux/if_ether.h:23, from include/linux/etherdevice.h:25, from net/wireless/util.c:9: net/wireless/util.c: In function 'ieee80211_get_vht_max_nss': >> include/uapi/linux/kernel.h:12:49: warning: 'max_vht_nss' may be used uninitialized in this function [-Wmaybe-uninitialized] #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) ^ net/wireless/util.c:1880:6: note: 'max_vht_nss' was declared here int max_vht_nss; ^ vim +/max_vht_nss +12 include/uapi/linux/kernel.h 607ca46e David Howells 2012-10-13 1 #ifndef _UAPI_LINUX_KERNEL_H 607ca46e David Howells 2012-10-13 2 #define _UAPI_LINUX_KERNEL_H 607ca46e David Howells 2012-10-13 3 607ca46e David Howells 2012-10-13 4 #include <linux/sysinfo.h> 607ca46e David Howells 2012-10-13 5 607ca46e David Howells 2012-10-13 6 /* 607ca46e David Howells 2012-10-13 7 * 'kernel.h' contains some often-used function prototypes etc 607ca46e David Howells 2012-10-13 8 */ 607ca46e David Howells 2012-10-13 9 #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) 607ca46e David Howells 2012-10-13 10 #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) 607ca46e David Howells 2012-10-13 11 b5d3755a Nicolas Dichtel 2016-03-04 @12 #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 607ca46e David Howells 2012-10-13 13 607ca46e David Howells 2012-10-13 14 #endif /* _UAPI_LINUX_KERNEL_H */ :::::: The code at line 12 was first introduced by commit :::::: b5d3755a22e0cc4c369c0985aef0c52c2477c1e7 uapi: define DIV_ROUND_UP for userland :::::: TO: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx> :::::: CC: David S. Miller <davem@xxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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