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Date: Wed, 23 Mar 2016 18:17:41 -0300 From: Arnaldo Carvalho de Melo <acme@...nel.org> To: Ingo Molnar <mingo@...nel.org> Cc: linux-kernel@...r.kernel.org, Jakub Jelen <jakuje@...il.com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jakub Jelen <jjelen@...hat.com>, Peter Zijlstra <peterz@...radead.org>, trivial@...nel.org, Arnaldo Carvalho de Melo <acme@...hat.com> Subject: [PATCH 04/23] perf bench numa: Fix assertion for nodes bitfield From: Jakub Jelen <jakuje@...il.com> Comparing bits and bytes in numa benchmark assertion I hit the issue on two socket Power8 machine presenting its numa nodes as 0,1,16,17 (according to numactl). Therefore I got error (and hang of parent process): perf: bench/numa.c:296: bind_to_memnode: Assertion `!(g->p.nr_nodes > (int)sizeof(nodemask))' failed. This is obviously false positive. We can fit all the 18 nodes into bitfield of 8 bytes (long on 64b architecture). Signed-off-by: Jakub Jelen <jakuje@...il.com> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com> Cc: Jakub Jelen <jjelen@...hat.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: trivial@...nel.org Link: http://lkml.kernel.org/r/1458388687-24421-1-git-send-email-jakuje@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com> --- tools/perf/bench/numa.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c index 5049d6357a46..7500d959d7eb 100644 --- a/tools/perf/bench/numa.c +++ b/tools/perf/bench/numa.c @@ -293,7 +293,7 @@ static void bind_to_memnode(int node) if (node == -1) return; - BUG_ON(g->p.nr_nodes > (int)sizeof(nodemask)); + BUG_ON(g->p.nr_nodes > (int)sizeof(nodemask)*8); nodemask = 1L << node; ret = set_mempolicy(MPOL_BIND, &nodemask, sizeof(nodemask)*8); -- 2.5.5
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