Hi Netanel, [auto build test WARNING on net/master]
url: https://github.com/0day-ci/linux/commits/Netanel-Belgazal/Update-ENA-driver-to-version-1-1-2/20161120-165649 config: i386-randconfig-h1-11212236 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 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/mmzone.h:15:0, from include/linux/gfp.h:5, from include/linux/cpu_rmap.h:14, from drivers/net/ethernet/amazon/ena/ena_netdev.c:36: drivers/net/ethernet/amazon/ena/ena_netdev.c: In function 'ena_get_stats64': >> include/linux/seqlock.h:204:19: warning: 'rx_ring' may be used uninitialized >> in this function [-Wmaybe-uninitialized] return unlikely(s->sequence != start); ^~ drivers/net/ethernet/amazon/ena/ena_netdev.c:2188:19: note: 'rx_ring' was declared here struct ena_ring *rx_ring, *tx_ring; ^~~~~~~ vim +/rx_ring +204 include/linux/seqlock.h 4f988f15 Linus Torvalds 2012-05-04 188 /** 3c22cd57 Nick Piggin 2011-01-07 189 * __read_seqcount_retry - end a seq-read critical section (without barrier) 3c22cd57 Nick Piggin 2011-01-07 190 * @s: pointer to seqcount_t 3c22cd57 Nick Piggin 2011-01-07 191 * @start: count, from read_seqcount_begin 3c22cd57 Nick Piggin 2011-01-07 192 * Returns: 1 if retry is required, else 0 3c22cd57 Nick Piggin 2011-01-07 193 * 3c22cd57 Nick Piggin 2011-01-07 194 * __read_seqcount_retry is like read_seqcount_retry, but has no smp_rmb() 3c22cd57 Nick Piggin 2011-01-07 195 * barrier. Callers should ensure that smp_rmb() or equivalent ordering is 3c22cd57 Nick Piggin 2011-01-07 196 * provided before actually loading any of the variables that are to be 3c22cd57 Nick Piggin 2011-01-07 197 * protected in this critical section. 3c22cd57 Nick Piggin 2011-01-07 198 * 3c22cd57 Nick Piggin 2011-01-07 199 * Use carefully, only in critical code, and comment how the barrier is 3c22cd57 Nick Piggin 2011-01-07 200 * provided. 3c22cd57 Nick Piggin 2011-01-07 201 */ 3c22cd57 Nick Piggin 2011-01-07 202 static inline int __read_seqcount_retry(const seqcount_t *s, unsigned start) 3c22cd57 Nick Piggin 2011-01-07 203 { 3c22cd57 Nick Piggin 2011-01-07 @204 return unlikely(s->sequence != start); 3c22cd57 Nick Piggin 2011-01-07 205 } 3c22cd57 Nick Piggin 2011-01-07 206 3c22cd57 Nick Piggin 2011-01-07 207 /** 3c22cd57 Nick Piggin 2011-01-07 208 * read_seqcount_retry - end a seq-read critical section 3c22cd57 Nick Piggin 2011-01-07 209 * @s: pointer to seqcount_t 3c22cd57 Nick Piggin 2011-01-07 210 * @start: count, from read_seqcount_begin 3c22cd57 Nick Piggin 2011-01-07 211 * Returns: 1 if retry is required, else 0 3c22cd57 Nick Piggin 2011-01-07 212 * :::::: The code at line 204 was first introduced by commit :::::: 3c22cd5709e8143444a6d08682a87f4c57902df3 kernel: optimise seqlock :::::: TO: Nick Piggin <npig...@kernel.dk> :::::: CC: Nick Piggin <npig...@kernel.dk> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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