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commit 97a9ceb2a294ee3218987daf84a5ab3d9d361e27
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Author: Martin Cermak <mcermak@redhat.com>
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Date: Thu Jun 14 14:35:26 2018 +0200
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Improve the foreach_limit(2).exp test results.
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Without this update, one can observe following issue with rhel7
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powerpc kernels:
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=======
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# stap -p4 testsuite/systemtap.maps/foreach_limit.stp
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...
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/usr/local/share/systemtap/runtime/map.c:275:26: error: ‘a’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
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struct mlist_head *c, *a, *last, *tmp;
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^
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/usr/local/share/systemtap/runtime/map.c:275:26: error: ‘a’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
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cc1: all warnings being treated as errors
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=======
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This problem turns out to start happening after the powerpc kernel
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build system started using -O3 instead of -O2 as one can see in
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http://vault.centos.org/7.5.1804/os/Source/SPackages/kernel-3.10.0-862.el7.src.rpm
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=======
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# powerpc is compiled with -O3, via specfile rpmbuild -- see rhbz1051067.
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# we need to keep consistency here, however, for out of tree kmod builds --
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# see rhbz1431029 for reference
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ifeq ($(SRCARCH), powerpc)
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KBUILD_CFLAGS += -O3
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else
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KBUILD_CFLAGS += -O2
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endif
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=======
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Reverting this change (using -O2 instead of -O3) works the problem around
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as well as this systemtap-side update. For more details, see rhbz1591267.
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diff --git a/runtime/map.c b/runtime/map.c
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index 5caf739..ef91456 100644
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--- a/runtime/map.c
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+++ b/runtime/map.c
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@@ -272,7 +272,7 @@ static void _stp_map_sortn(MAP map, int n, int keynum, int dir,
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_stp_map_sort(map, keynum, dir, get_key);
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} else {
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struct mlist_head *head = &map->head;
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- struct mlist_head *c, *a, *last, *tmp;
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+ struct mlist_head *c, *a = 0, *last, *tmp;
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int num, swaps = 1;
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if (mlist_empty(head))
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