This is a note to let you know that I've just added the patch titled
perf tools: Fix perf regs mask generation
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-tools-fix-perf-regs-mask-generation.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f47822078dece7189cad0a5f472f148e5e916736 Mon Sep 17 00:00:00 2001
From: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Date: Thu, 28 Apr 2016 15:01:10 +0530
Subject: perf tools: Fix perf regs mask generation
From: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxx>
Acked-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/perf/util/perf_regs.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/tools/perf/util/perf_regs.c
+++ b/tools/perf/util/perf_regs.c
@@ -12,18 +12,18 @@ int perf_reg_value(u64 *valp, struct reg
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:
Patches currently in stable-queue which might be from naveen.n.rao@xxxxxxxxxxxxxxxxxx are
queue-4.4/perf-tools-fix-perf-regs-mask-generation.patch
