From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Mon, 13 Feb 2023 22:51:14 +0000 (-0500)
Subject: Fix cpu_relax()
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=c1677df62edb8be05caf7a6862b599f8e74c404f;p=bcachefs-tools-debian

Fix cpu_relax()

cpu_relax() is supposed to be a compiler barrier - this fixes a bug with
btree_write_buffer_flush() getting stuck.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index a21b7cc..a55b8a9 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -132,8 +132,8 @@
 
 #define might_sleep()
 
-#define cpu_relax()		do {} while (0)
-#define cpu_relax_lowlatency()	do {} while (0)
+#define cpu_relax()		barrier()
+#define cpu_relax_lowlatency()	barrier()
 
 #define panic(fmt, ...)					\
 do {							\