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perf tools: Fix perf regs mask generation

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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@linux.vnet.ibm.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naveen N. Rao 2016-04-28 15:01:10 +05:30 committed by Greg Kroah-Hartman
parent 24769c71b2
commit 1a343f4dae
1 changed files with 4 additions and 4 deletions
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8
tools/perf/util/perf_regs.c
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@ -12,18 +12,18 @@ 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: