* [PATCH 1/2] x86/percpu: Rename percpu_stable_op() to __raw_cpu_read_stable()
@ 2024-05-20 8:09 Uros Bizjak
2024-05-20 8:09 ` [PATCH 2/2] x86/percpu: Move some percpu accessors around to reduce ifdeffery Uros Bizjak
2024-05-21 8:21 ` [tip: x86/percpu] x86/percpu: Rename percpu_stable_op() to __raw_cpu_read_stable() tip-bot2 for Uros Bizjak
0 siblings, 2 replies; 4+ messages in thread
From: Uros Bizjak @ 2024-05-20 8:09 UTC (permalink / raw)
To: linux-kernel, x86
Cc: Uros Bizjak, Thomas Gleixner, Ingo Molnar, Borislav Petkov,
Dave Hansen, H. Peter Anvin
Rename percpu_stable_op() to __raw_cpu_read_stable() to be
in line with other read/write percpu accessors.
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
---
arch/x86/include/asm/percpu.h | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index c77393cd0273..39762fcfe328 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -190,10 +190,10 @@ do { \
#endif /* CONFIG_USE_X86_SEG_SUPPORT */
-#define percpu_stable_op(size, op, _var) \
+#define __raw_cpu_read_stable(size, _var) \
({ \
__pcpu_type_##size pfo_val__; \
- asm(__pcpu_op2_##size(op, __force_percpu_arg(a[var]), "%[val]") \
+ asm(__pcpu_op2_##size("mov", __force_percpu_arg(a[var]), "%[val]") \
: [val] __pcpu_reg_##size("=", pfo_val__) \
: [var] "i" (&(_var))); \
(typeof(_var))(unsigned long) pfo_val__; \
@@ -480,9 +480,9 @@ do { \
#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp)
-#define this_cpu_read_stable_1(pcp) percpu_stable_op(1, "mov", pcp)
-#define this_cpu_read_stable_2(pcp) percpu_stable_op(2, "mov", pcp)
-#define this_cpu_read_stable_4(pcp) percpu_stable_op(4, "mov", pcp)
+#define this_cpu_read_stable_1(pcp) __raw_cpu_read_stable(1, pcp)
+#define this_cpu_read_stable_2(pcp) __raw_cpu_read_stable(2, pcp)
+#define this_cpu_read_stable_4(pcp) __raw_cpu_read_stable(4, pcp)
#define raw_cpu_add_1(pcp, val) percpu_add_op(1, , (pcp), val)
#define raw_cpu_add_2(pcp, val) percpu_add_op(2, , (pcp), val)
@@ -535,7 +535,7 @@ do { \
* 32 bit must fall back to generic operations.
*/
#ifdef CONFIG_X86_64
-#define this_cpu_read_stable_8(pcp) percpu_stable_op(8, "mov", pcp)
+#define this_cpu_read_stable_8(pcp) __raw_cpu_read_stable(8, pcp)
#define raw_cpu_add_8(pcp, val) percpu_add_op(8, , (pcp), val)
#define raw_cpu_and_8(pcp, val) percpu_binary_op(8, , "and", (pcp), val)
--
2.45.1
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 2/2] x86/percpu: Move some percpu accessors around to reduce ifdeffery
2024-05-20 8:09 [PATCH 1/2] x86/percpu: Rename percpu_stable_op() to __raw_cpu_read_stable() Uros Bizjak
@ 2024-05-20 8:09 ` Uros Bizjak
2024-05-21 8:21 ` [tip: x86/percpu] " tip-bot2 for Uros Bizjak
2024-05-21 8:21 ` [tip: x86/percpu] x86/percpu: Rename percpu_stable_op() to __raw_cpu_read_stable() tip-bot2 for Uros Bizjak
1 sibling, 1 reply; 4+ messages in thread
From: Uros Bizjak @ 2024-05-20 8:09 UTC (permalink / raw)
To: linux-kernel, x86
Cc: Uros Bizjak, Thomas Gleixner, Ingo Molnar, Borislav Petkov,
Dave Hansen, H. Peter Anvin
Move some percpu accessors around, mainly to reduce ifdeffery
and improve readabilty by following dependencies between
accessors.
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
---
arch/x86/include/asm/percpu.h | 40 +++++++++++++++++------------------
1 file changed, 19 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 39762fcfe328..0f0d8973f8df 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -445,17 +445,6 @@ do { \
#define this_cpu_try_cmpxchg128(pcp, ovalp, nval) percpu_try_cmpxchg128_op(16, volatile, pcp, ovalp, nval)
#endif
-/*
- * this_cpu_read() makes gcc load the percpu variable every time it is
- * accessed while this_cpu_read_stable() allows the value to be cached.
- * this_cpu_read_stable() is more efficient and can be used if its value
- * is guaranteed to be valid across cpus. The current users include
- * pcpu_hot.current_task and pcpu_hot.top_of_stack, both of which are
- * actually per-thread variables implemented as per-CPU variables and
- * thus stable for the duration of the respective task.
- */
-#define this_cpu_read_stable(pcp) __pcpu_size_call_return(this_cpu_read_stable_, pcp)
-
#define raw_cpu_read_1(pcp) __raw_cpu_read(1, , pcp)
#define raw_cpu_read_2(pcp) __raw_cpu_read(2, , pcp)
#define raw_cpu_read_4(pcp) __raw_cpu_read(4, , pcp)
@@ -470,16 +459,6 @@ do { \
#define this_cpu_write_2(pcp, val) __raw_cpu_write(2, volatile, pcp, val)
#define this_cpu_write_4(pcp, val) __raw_cpu_write(4, volatile, pcp, val)
-#ifdef CONFIG_X86_64
-#define raw_cpu_read_8(pcp) __raw_cpu_read(8, , pcp)
-#define raw_cpu_write_8(pcp, val) __raw_cpu_write(8, , pcp, val)
-
-#define this_cpu_read_8(pcp) __raw_cpu_read(8, volatile, pcp)
-#define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val)
-#endif
-
-#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp)
-
#define this_cpu_read_stable_1(pcp) __raw_cpu_read_stable(1, pcp)
#define this_cpu_read_stable_2(pcp) __raw_cpu_read_stable(2, pcp)
#define this_cpu_read_stable_4(pcp) __raw_cpu_read_stable(4, pcp)
@@ -535,6 +514,12 @@ do { \
* 32 bit must fall back to generic operations.
*/
#ifdef CONFIG_X86_64
+#define raw_cpu_read_8(pcp) __raw_cpu_read(8, , pcp)
+#define raw_cpu_write_8(pcp, val) __raw_cpu_write(8, , pcp, val)
+
+#define this_cpu_read_8(pcp) __raw_cpu_read(8, volatile, pcp)
+#define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val)
+
#define this_cpu_read_stable_8(pcp) __raw_cpu_read_stable(8, pcp)
#define raw_cpu_add_8(pcp, val) percpu_add_op(8, , (pcp), val)
@@ -561,6 +546,19 @@ do { \
#define raw_cpu_read_long(pcp) raw_cpu_read_4(pcp)
#endif
+#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp)
+
+/*
+ * this_cpu_read() makes gcc load the percpu variable every time it is
+ * accessed while this_cpu_read_stable() allows the value to be cached.
+ * this_cpu_read_stable() is more efficient and can be used if its value
+ * is guaranteed to be valid across cpus. The current users include
+ * pcpu_hot.current_task and pcpu_hot.top_of_stack, both of which are
+ * actually per-thread variables implemented as per-CPU variables and
+ * thus stable for the duration of the respective task.
+ */
+#define this_cpu_read_stable(pcp) __pcpu_size_call_return(this_cpu_read_stable_, pcp)
+
#define x86_this_cpu_constant_test_bit(_nr, _var) \
({ \
unsigned long __percpu *addr__ = \
--
2.45.1
^ permalink raw reply [flat|nested] 4+ messages in thread
* [tip: x86/percpu] x86/percpu: Rename percpu_stable_op() to __raw_cpu_read_stable()
2024-05-20 8:09 [PATCH 1/2] x86/percpu: Rename percpu_stable_op() to __raw_cpu_read_stable() Uros Bizjak
2024-05-20 8:09 ` [PATCH 2/2] x86/percpu: Move some percpu accessors around to reduce ifdeffery Uros Bizjak
@ 2024-05-21 8:21 ` tip-bot2 for Uros Bizjak
1 sibling, 0 replies; 4+ messages in thread
From: tip-bot2 for Uros Bizjak @ 2024-05-21 8:21 UTC (permalink / raw)
To: linux-tip-commits
Cc: Uros Bizjak, Ingo Molnar, Andy Lutomirski, Josh Poimboeuf,
Linus Torvalds, x86, linux-kernel
The following commit has been merged into the x86/percpu branch of tip:
Commit-ID: 48908919c9062bf9472def7389dd7cd9c6a45b70
Gitweb: https://git.kernel.org/tip/48908919c9062bf9472def7389dd7cd9c6a45b70
Author: Uros Bizjak <ubizjak@gmail.com>
AuthorDate: Mon, 20 May 2024 10:09:24 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Mon, 20 May 2024 10:17:10 +02:00
x86/percpu: Rename percpu_stable_op() to __raw_cpu_read_stable()
Rename percpu_stable_op() to __raw_cpu_read_stable() to be
in line with other read/write percpu accessors.
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Uros Bizjak <ubizjak@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240520080951.121049-1-ubizjak@gmail.com
---
arch/x86/include/asm/percpu.h | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index c77393c..39762fc 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -190,10 +190,10 @@ do { \
#endif /* CONFIG_USE_X86_SEG_SUPPORT */
-#define percpu_stable_op(size, op, _var) \
+#define __raw_cpu_read_stable(size, _var) \
({ \
__pcpu_type_##size pfo_val__; \
- asm(__pcpu_op2_##size(op, __force_percpu_arg(a[var]), "%[val]") \
+ asm(__pcpu_op2_##size("mov", __force_percpu_arg(a[var]), "%[val]") \
: [val] __pcpu_reg_##size("=", pfo_val__) \
: [var] "i" (&(_var))); \
(typeof(_var))(unsigned long) pfo_val__; \
@@ -480,9 +480,9 @@ do { \
#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp)
-#define this_cpu_read_stable_1(pcp) percpu_stable_op(1, "mov", pcp)
-#define this_cpu_read_stable_2(pcp) percpu_stable_op(2, "mov", pcp)
-#define this_cpu_read_stable_4(pcp) percpu_stable_op(4, "mov", pcp)
+#define this_cpu_read_stable_1(pcp) __raw_cpu_read_stable(1, pcp)
+#define this_cpu_read_stable_2(pcp) __raw_cpu_read_stable(2, pcp)
+#define this_cpu_read_stable_4(pcp) __raw_cpu_read_stable(4, pcp)
#define raw_cpu_add_1(pcp, val) percpu_add_op(1, , (pcp), val)
#define raw_cpu_add_2(pcp, val) percpu_add_op(2, , (pcp), val)
@@ -535,7 +535,7 @@ do { \
* 32 bit must fall back to generic operations.
*/
#ifdef CONFIG_X86_64
-#define this_cpu_read_stable_8(pcp) percpu_stable_op(8, "mov", pcp)
+#define this_cpu_read_stable_8(pcp) __raw_cpu_read_stable(8, pcp)
#define raw_cpu_add_8(pcp, val) percpu_add_op(8, , (pcp), val)
#define raw_cpu_and_8(pcp, val) percpu_binary_op(8, , "and", (pcp), val)
^ permalink raw reply [flat|nested] 4+ messages in thread
* [tip: x86/percpu] x86/percpu: Move some percpu accessors around to reduce ifdeffery
2024-05-20 8:09 ` [PATCH 2/2] x86/percpu: Move some percpu accessors around to reduce ifdeffery Uros Bizjak
@ 2024-05-21 8:21 ` tip-bot2 for Uros Bizjak
0 siblings, 0 replies; 4+ messages in thread
From: tip-bot2 for Uros Bizjak @ 2024-05-21 8:21 UTC (permalink / raw)
To: linux-tip-commits
Cc: Uros Bizjak, Ingo Molnar, Andy Lutomirski, Josh Poimboeuf,
Linus Torvalds, x86, linux-kernel
The following commit has been merged into the x86/percpu branch of tip:
Commit-ID: 47c9dbd2fb5f98453840e18ebced9138ec8b4cc5
Gitweb: https://git.kernel.org/tip/47c9dbd2fb5f98453840e18ebced9138ec8b4cc5
Author: Uros Bizjak <ubizjak@gmail.com>
AuthorDate: Mon, 20 May 2024 10:09:25 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Mon, 20 May 2024 10:25:31 +02:00
x86/percpu: Move some percpu accessors around to reduce ifdeffery
Move some percpu accessors around, mainly to reduce ifdeffery
and improve readabilty by following dependencies between
accessors.
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240520080951.121049-2-ubizjak@gmail.com
---
arch/x86/include/asm/percpu.h | 40 ++++++++++++++++------------------
1 file changed, 19 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 39762fc..0f0d897 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -445,17 +445,6 @@ do { \
#define this_cpu_try_cmpxchg128(pcp, ovalp, nval) percpu_try_cmpxchg128_op(16, volatile, pcp, ovalp, nval)
#endif
-/*
- * this_cpu_read() makes gcc load the percpu variable every time it is
- * accessed while this_cpu_read_stable() allows the value to be cached.
- * this_cpu_read_stable() is more efficient and can be used if its value
- * is guaranteed to be valid across cpus. The current users include
- * pcpu_hot.current_task and pcpu_hot.top_of_stack, both of which are
- * actually per-thread variables implemented as per-CPU variables and
- * thus stable for the duration of the respective task.
- */
-#define this_cpu_read_stable(pcp) __pcpu_size_call_return(this_cpu_read_stable_, pcp)
-
#define raw_cpu_read_1(pcp) __raw_cpu_read(1, , pcp)
#define raw_cpu_read_2(pcp) __raw_cpu_read(2, , pcp)
#define raw_cpu_read_4(pcp) __raw_cpu_read(4, , pcp)
@@ -470,16 +459,6 @@ do { \
#define this_cpu_write_2(pcp, val) __raw_cpu_write(2, volatile, pcp, val)
#define this_cpu_write_4(pcp, val) __raw_cpu_write(4, volatile, pcp, val)
-#ifdef CONFIG_X86_64
-#define raw_cpu_read_8(pcp) __raw_cpu_read(8, , pcp)
-#define raw_cpu_write_8(pcp, val) __raw_cpu_write(8, , pcp, val)
-
-#define this_cpu_read_8(pcp) __raw_cpu_read(8, volatile, pcp)
-#define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val)
-#endif
-
-#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp)
-
#define this_cpu_read_stable_1(pcp) __raw_cpu_read_stable(1, pcp)
#define this_cpu_read_stable_2(pcp) __raw_cpu_read_stable(2, pcp)
#define this_cpu_read_stable_4(pcp) __raw_cpu_read_stable(4, pcp)
@@ -535,6 +514,12 @@ do { \
* 32 bit must fall back to generic operations.
*/
#ifdef CONFIG_X86_64
+#define raw_cpu_read_8(pcp) __raw_cpu_read(8, , pcp)
+#define raw_cpu_write_8(pcp, val) __raw_cpu_write(8, , pcp, val)
+
+#define this_cpu_read_8(pcp) __raw_cpu_read(8, volatile, pcp)
+#define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val)
+
#define this_cpu_read_stable_8(pcp) __raw_cpu_read_stable(8, pcp)
#define raw_cpu_add_8(pcp, val) percpu_add_op(8, , (pcp), val)
@@ -561,6 +546,19 @@ do { \
#define raw_cpu_read_long(pcp) raw_cpu_read_4(pcp)
#endif
+#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp)
+
+/*
+ * this_cpu_read() makes gcc load the percpu variable every time it is
+ * accessed while this_cpu_read_stable() allows the value to be cached.
+ * this_cpu_read_stable() is more efficient and can be used if its value
+ * is guaranteed to be valid across cpus. The current users include
+ * pcpu_hot.current_task and pcpu_hot.top_of_stack, both of which are
+ * actually per-thread variables implemented as per-CPU variables and
+ * thus stable for the duration of the respective task.
+ */
+#define this_cpu_read_stable(pcp) __pcpu_size_call_return(this_cpu_read_stable_, pcp)
+
#define x86_this_cpu_constant_test_bit(_nr, _var) \
({ \
unsigned long __percpu *addr__ = \
^ permalink raw reply [flat|nested] 4+ messages in thread
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2024-05-20 8:09 ` [PATCH 2/2] x86/percpu: Move some percpu accessors around to reduce ifdeffery Uros Bizjak
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