linux-kernel - [RFC 1/4] rseq/param_test: Convert test_data_entry::count to intptr

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Date:	Wed, 27 Jul 2016 23:05:14 +0800
From:	Boqun Feng <boqun.feng@...il.com>
To:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
	Andrew Hunter <ahh@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>,
	Dave Watson <davejwatson@...com>, Chris Lameter <cl@...ux.com>,
	Ben Maurer <bmaurer@...com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Boqun Feng <boqun.feng@...il.com>
Subject: [RFC 1/4] rseq/param_test: Convert test_data_entry::count to intptr_t

The current semantics of do_resq() is to do a intptr_t type store in
successful cases, however, in test_percpu_{inc,spinlock}, we use
test_data_entry::count as the location to store, whose type is int.

intptr_t and int have different size on LP64 systems, and despite the
inconsistency of types, having test_data_entry::count as int needs more
care on endian handling.

To make things simpler and more consistent, convert
test_data_entry::count to type intptr_t, which also makes the coming
tests for ppc64le and ppc64 share the same code.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 tools/testing/selftests/rseq/param_test.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/rseq/param_test.c b/tools/testing/selftests/rseq/param_test.c
index f95fba5a1b2a..db25e0a818e5 100644
--- a/tools/testing/selftests/rseq/param_test.c
+++ b/tools/testing/selftests/rseq/param_test.c
@@ -124,7 +124,7 @@ struct percpu_lock {
 };
 
 struct test_data_entry {
-	int count;
+	intptr_t count;
 } __attribute__((aligned(128)));
 
 struct spinlock_test_data {
@@ -234,7 +234,8 @@ void *test_percpu_spinlock_thread(void *arg)
 void test_percpu_spinlock(void)
 {
 	const int num_threads = opt_threads;
-	int i, sum, ret;
+	int i, ret;
+	intptr_t sum;
 	pthread_t test_threads[num_threads];
 	struct spinlock_test_data data;
 	struct spinlock_thread_test_data thread_data[num_threads];
@@ -308,7 +309,8 @@ void *test_percpu_inc_thread(void *arg)
 void test_percpu_inc(void)
 {
 	const int num_threads = opt_threads;
-	int i, sum, ret;
+	int i, ret;
+	intptr_t sum;
 	pthread_t test_threads[num_threads];
 	struct inc_test_data data;
 	struct inc_thread_test_data thread_data[num_threads];
-- 
2.9.0