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From:   Alistair Francis <alistair.francis@opensource.wdc.com>
To:     linux-riscv@lists.infradead.org, linux-perf-users@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, alistair23@gmail.com,
        namhyung@kernel.org, jolsa@redhat.com,
        alexander.shishkin@linux.intel.com, mark.rutland@arm.com,
        acme@kernel.org, dave@stgolabs.net, dvhart@infradead.org,
        peterz@infradead.org, mingo@redhat.com, tglx@linutronix.de,
        atish.patra@wdc.com, arnd@arndb.de,
        Alistair Francis <alistair.francis@wdc.com>
Subject: [PATCH] perf bench: Add support for 32-bit systems with 64-bit time_t
Date:   Thu,  9 Sep 2021 14:25:43 +1000
Message-Id: <20210909042543.1982893-1-alistair.francis@opensource.wdc.com>
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From: Alistair Francis <alistair.francis@wdc.com>

Some 32-bit architectures (such are 32-bit RISC-V) only have a 64-bit
time_t and as such don't have the SYS_futex syscall. This patch will
allow us to use the SYS_futex_time64 syscall on those platforms.

This patch does not attempt to gracefully allow 32-bit architectures
with both SYS_futex and SYS_futex_time64 to support a 64-bit time_t.
This patch only applies to 32-bit architectures with a 64-bit time_t.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 tools/perf/bench/futex.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/perf/bench/futex.h b/tools/perf/bench/futex.h
index b3853aac3021..912342d7f594 100644
--- a/tools/perf/bench/futex.h
+++ b/tools/perf/bench/futex.h
@@ -27,6 +27,17 @@ struct bench_futex_parameters {
 	unsigned int nrequeue;
 };
=20
+/**
+ * Some newer 32-bit architectures (such as RISC-V 32-bit) don't have
+ * the SYS_futex syscall and instead only have the SYS_futex_time64 call=
.
+ * Let's ensure that those still compile and run by just using the
+ * SYS_futex_time64 syscall. On these systems `struct timespec` will use=
 a
+ * 64-bit time_t so the SYS_futex_time64 call will work.
+ */
+#if !defined(SYS_futex) && defined(SYS_futex_time64)
+ #define SYS_futex SYS_futex_time64
+#endif
+
 /**
  * futex() - SYS_futex syscall wrapper
  * @uaddr:	address of first futex
--=20
2.31.1