linux-kernel - [PATCH 2/2] tools: Optimize ring buffer for riscv

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Message-Id: <20240729-optimize_ring_buffer_read_riscv-v1-2-6bbc0f2434ee@rivosinc.com>
Date: Mon, 29 Jul 2024 13:50:36 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Andrea Parri <parri.andrea@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 Charlie Jenkins <charlie@...osinc.com>
Subject: [PATCH 2/2] tools: Optimize ring buffer for riscv

Now that riscv supports optimized barriers, use them in the ring buffer.

Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
 tools/include/linux/ring_buffer.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/include/linux/ring_buffer.h b/tools/include/linux/ring_buffer.h
index 6c02617377c2..a74c397359c7 100644
--- a/tools/include/linux/ring_buffer.h
+++ b/tools/include/linux/ring_buffer.h
@@ -55,7 +55,7 @@ static inline u64 ring_buffer_read_head(struct perf_event_mmap_page *base)
  * READ_ONCE() + smp_mb() pair.
  */
 #if defined(__x86_64__) || defined(__aarch64__) || defined(__powerpc64__) || \
-    defined(__ia64__) || defined(__sparc__) && defined(__arch64__)
+    defined(__ia64__) || defined(__sparc__) && defined(__arch64__) || defined(__riscv)
 	return smp_load_acquire(&base->data_head);
 #else
 	u64 head = READ_ONCE(base->data_head);

-- 
2.44.0