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Message-ID: <171093475924.10875.15112548554818833406.tip-bot2@tip-bot2>
Date: Wed, 20 Mar 2024 11:39:19 -0000
From: "tip-bot2 for Uros Bizjak" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>, Ingo Molnar <mingo@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject:
[tip: x86/percpu] x86/percpu: Move raw_percpu_xchg_op() to a better place
The following commit has been merged into the x86/percpu branch of tip:
Commit-ID: ce99b9c8daff3352a2ae0c72acf44e0663095fea
Gitweb: https://git.kernel.org/tip/ce99b9c8daff3352a2ae0c72acf44e0663095fea
Author: Uros Bizjak <ubizjak@...il.com>
AuthorDate: Wed, 20 Mar 2024 09:30:41 +01:00
Committer: Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 20 Mar 2024 12:29:17 +01:00
x86/percpu: Move raw_percpu_xchg_op() to a better place
Move raw_percpu_xchg_op() together with this_percpu_xchg_op()
and trivially rename some internal variables to harmonize them
between macro implementations.
No functional changes intended.
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: https://lore.kernel.org/r/20240320083127.493250-2-ubizjak@gmail.com
---
arch/x86/include/asm/percpu.h | 23 +++++++++++------------
1 file changed, 11 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index de991e6..7563e69 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -230,6 +230,17 @@ do { \
})
/*
+ * raw_cpu_xchg() can use a load-store since
+ * it is not required to be IRQ-safe.
+ */
+#define raw_percpu_xchg_op(_var, _nval) \
+({ \
+ typeof(_var) pxo_old__ = raw_cpu_read(_var); \
+ raw_cpu_write(_var, _nval); \
+ pxo_old__; \
+})
+
+/*
* this_cpu_xchg() is implemented using cmpxchg without a lock prefix.
* xchg is expensive due to the implied lock prefix. The processor
* cannot prefetch cachelines if xchg is used.
@@ -499,18 +510,6 @@ do { \
#define raw_cpu_or_1(pcp, val) percpu_to_op(1, , "or", (pcp), val)
#define raw_cpu_or_2(pcp, val) percpu_to_op(2, , "or", (pcp), val)
#define raw_cpu_or_4(pcp, val) percpu_to_op(4, , "or", (pcp), val)
-
-/*
- * raw_cpu_xchg() can use a load-store since it is not required to be
- * IRQ-safe.
- */
-#define raw_percpu_xchg_op(var, nval) \
-({ \
- typeof(var) pxo_ret__ = raw_cpu_read(var); \
- raw_cpu_write(var, (nval)); \
- pxo_ret__; \
-})
-
#define raw_cpu_xchg_1(pcp, val) raw_percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_2(pcp, val) raw_percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_4(pcp, val) raw_percpu_xchg_op(pcp, val)
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