linux-kernel - [PATCH] perf: enum overflow in uapi/linux/perf

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Date:   Fri,  7 Sep 2018 13:27:19 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] perf: enum overflow in uapi/linux/perf_event.h

On PPC32, enums are 32 bits, so __PERF_SAMPLE_CALLCHAIN_EARLY is
out of scope. The following sparse warning is encountered:

  CHECK   arch/powerpc/kernel/process.c
./include/uapi/linux/perf_event.h:147:56: warning: cast truncates bits from constant value (8000000000000000 becomes 0)

This patch changes it to a #define

Fixes: 6cbc304f2f360 ("perf/x86/intel: Fix unwind errors from PEBS entries (mk-II)")
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 include/uapi/linux/perf_event.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index eeb787b1c53c..27c7842bc86a 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -143,10 +143,10 @@ enum perf_event_sample_format {
 	PERF_SAMPLE_PHYS_ADDR			= 1U << 19,
 
 	PERF_SAMPLE_MAX = 1U << 20,		/* non-ABI */
-
-	__PERF_SAMPLE_CALLCHAIN_EARLY		= 1ULL << 63,
 };
 
+#define __PERF_SAMPLE_CALLCHAIN_EARLY		(1ULL << 63)
+
 /*
  * values to program into branch_sample_type when PERF_SAMPLE_BRANCH is set
  *
-- 
2.13.3