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From: Michael Jeanson via lttng-dev <lttng-dev@lists.lttng.org>
To: lttng-dev@lists.lttng.org
Subject: [lttng-dev] [PATCH urcu 2/4] Blacklist GCC 4.4.0, 4.4.1 and 4.4.2 on ARM
Date: Tue, 15 Dec 2020 11:28:48 -0500	[thread overview]
Message-ID: <20201215162850.78638-2-mjeanson@efficios.com> (raw)
In-Reply-To: <20201215162850.78638-1-mjeanson@efficios.com>

GCC added __sync_synchronize() in 4.4.0 but it was broken on ARM until
4.4.3, see the GCC bug report for more details :

  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42263

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Change-Id: I629e3c8b4baaccb34b2311e220f30d0ad8b69a19
---
 include/urcu/arch/arm.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/urcu/arch/arm.h b/include/urcu/arch/arm.h
index 5d1c608..e904b06 100644
--- a/include/urcu/arch/arm.h
+++ b/include/urcu/arch/arm.h
@@ -70,6 +70,15 @@ extern "C" {
 # endif
 #endif
 
+/*
+ * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42263
+ */
+#ifdef URCU_GCC_VERSION
+# if URCU_GCC_VERSION >= 40400 && URCU_GCC_VERSION <= 40402
+#  error Your gcc version has a non-functional __sync_synchronize()
+# endif
+#endif
+
 #ifdef __cplusplus
 }
 #endif
-- 
2.29.2

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  reply	other threads:[~2020-12-15 16:29 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-15 16:28 [lttng-dev] [PATCH urcu 1/4] Cleanup: Move ARM specific code to urcu/arch/arm.h Michael Jeanson via lttng-dev
2020-12-15 16:28 ` Michael Jeanson via lttng-dev [this message]
2020-12-17 13:29   ` [lttng-dev] [PATCH urcu 2/4] Blacklist GCC 4.4.0, 4.4.1 and 4.4.2 on ARM Mathieu Desnoyers via lttng-dev
2020-12-15 16:28 ` [lttng-dev] [PATCH urcu 3/4] Use DMB only on ARMv7 Michael Jeanson via lttng-dev
2020-12-17 13:29   ` Mathieu Desnoyers via lttng-dev
2020-12-15 16:28 ` [lttng-dev] [PATCH urcu 4/4] Don't force a target and optimization level " Michael Jeanson via lttng-dev
2020-12-15 16:39   ` Paul E. McKenney via lttng-dev
2020-12-17 13:30   ` Mathieu Desnoyers via lttng-dev
2020-12-17 13:29 ` [lttng-dev] [PATCH urcu 1/4] Cleanup: Move ARM specific code to urcu/arch/arm.h Mathieu Desnoyers via lttng-dev

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