[PATCH 4.2.y-ckt 182/206] perf tools: Fix perf regs mask generation

[Kamal Mostafa]

4.2.8-ckt12 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: "Naveen N. Rao" <naveen.n.rao at linux.vnet.ibm.com>

commit f47822078dece7189cad0a5f472f148e5e916736 upstream.

On some architectures (powerpc in particular), the number of registers
exceeds what can be represented in an integer bitmask. Ensure we
generate the proper bitmask on such platforms.

Fixes: 71ad0f5e4 ("perf tools: Support for DWARF CFI unwinding on post processing")
Signed-off-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>
Acked-by: Arnaldo Carvalho de Melo <acme at redhat.com>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 tools/perf/util/perf_regs.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c
index 43168fb..2fb6f2a 100644
--- a/tools/perf/util/perf_regs.c
+++ b/tools/perf/util/perf_regs.c
@@ -7,18 +7,18 @@ int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
 	int i, idx = 0;
 	u64 mask = regs->mask;
 
-	if (regs->cache_mask & (1 << id))
+	if (regs->cache_mask & (1ULL << id))
 		goto out;
 
-	if (!(mask & (1 << id)))
+	if (!(mask & (1ULL << id)))
 		return -EINVAL;
 
 	for (i = 0; i < id; i++) {
-		if (mask & (1 << i))
+		if (mask & (1ULL << i))
 			idx++;
 	}
 
-	regs->cache_mask |= (1 << id);
+	regs->cache_mask |= (1ULL << id);
 	regs->cache_regs[id] = regs->regs[idx];
 
 out:
-- 
2.7.4