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Message-Id: <20240528005648.182376-4-yury.norov@gmail.com>
Date: Mon, 27 May 2024 17:56:45 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
cgroups@...r.kernel.org,
linux-mm@...ck.org,
rcu@...r.kernel.org,
linux-trace-kernel@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Amit Daniel Kachhap <amit.kachhap@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Anna-Maria Behnsen <anna-maria@...utronix.de>,
Christoph Lameter <cl@...ux.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Dennis Zhou <dennis@...nel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Johannes Weiner <hannes@...xchg.org>,
Juri Lelli <juri.lelli@...hat.com>,
Kees Cook <keescook@...omium.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Peter Zijlstra <peterz@...radead.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Tejun Heo <tj@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ulf Hansson <ulf.hansson@...aro.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Zefan Li <lizefan.x@...edance.com>,
Yury Norov <yury.norov@...dia.com>
Subject: [PATCH 3/6] cpumask: split out include/linux/cpumask_types.h
From: Yury Norov <yury.norov@...dia.com>
Many core headers, like sched.h, include cpumask.h mostly for struct cpumask
and cpumask_var_t. Those are frequently used headers and shouldn't pull more
than the bare minimum.
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
MAINTAINERS | 1 +
include/linux/cpumask.h | 56 +----------------------------
include/linux/cpumask_types.h | 66 +++++++++++++++++++++++++++++++++++
3 files changed, 68 insertions(+), 55 deletions(-)
create mode 100644 include/linux/cpumask_types.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 6ae73aaee305..c4fa8f264156 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3731,6 +3731,7 @@ F: include/linux/bitmap-str.h
F: include/linux/bitmap.h
F: include/linux/bits.h
F: include/linux/cpumask.h
+F: include/linux/cpumask_types.h
F: include/linux/find.h
F: include/linux/nodemask.h
F: include/linux/nodemask_types.h
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 18410acdbc9e..79262a9ef03b 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -9,25 +9,13 @@
*/
#include <linux/cleanup.h>
#include <linux/kernel.h>
-#include <linux/threads.h>
#include <linux/bitmap.h>
+#include <linux/cpumask_types.h>
#include <linux/atomic.h>
#include <linux/bug.h>
#include <linux/gfp_types.h>
#include <linux/numa.h>
-/* Don't assign or return these: may not be this big! */
-typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
-
-/**
- * cpumask_bits - get the bits in a cpumask
- * @maskp: the struct cpumask *
- *
- * You should only assume nr_cpu_ids bits of this mask are valid. This is
- * a macro so it's const-correct.
- */
-#define cpumask_bits(maskp) ((maskp)->bits)
-
/**
* cpumask_pr_args - printf args to output a cpumask
* @maskp: cpumask to be printed
@@ -922,48 +910,7 @@ static inline unsigned int cpumask_size(void)
return bitmap_size(large_cpumask_bits);
}
-/*
- * cpumask_var_t: struct cpumask for stack usage.
- *
- * Oh, the wicked games we play! In order to make kernel coding a
- * little more difficult, we typedef cpumask_var_t to an array or a
- * pointer: doing &mask on an array is a noop, so it still works.
- *
- * i.e.
- * cpumask_var_t tmpmask;
- * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
- * return -ENOMEM;
- *
- * ... use 'tmpmask' like a normal struct cpumask * ...
- *
- * free_cpumask_var(tmpmask);
- *
- *
- * However, one notable exception is there. alloc_cpumask_var() allocates
- * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
- * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
- *
- * cpumask_var_t tmpmask;
- * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
- * return -ENOMEM;
- *
- * var = *tmpmask;
- *
- * This code makes NR_CPUS length memcopy and brings to a memory corruption.
- * cpumask_copy() provide safe copy functionality.
- *
- * Note that there is another evil here: If you define a cpumask_var_t
- * as a percpu variable then the way to obtain the address of the cpumask
- * structure differently influences what this_cpu_* operation needs to be
- * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
- * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
- * other type of cpumask_var_t implementation is configured.
- *
- * Please also note that __cpumask_var_read_mostly can be used to declare
- * a cpumask_var_t variable itself (not its content) as read mostly.
- */
#ifdef CONFIG_CPUMASK_OFFSTACK
-typedef struct cpumask *cpumask_var_t;
#define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
#define __cpumask_var_read_mostly __read_mostly
@@ -1010,7 +957,6 @@ static inline bool cpumask_available(cpumask_var_t mask)
}
#else
-typedef struct cpumask cpumask_var_t[1];
#define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
#define __cpumask_var_read_mostly
diff --git a/include/linux/cpumask_types.h b/include/linux/cpumask_types.h
new file mode 100644
index 000000000000..461ed1b6bcdb
--- /dev/null
+++ b/include/linux/cpumask_types.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_CPUMASK_TYPES_H
+#define __LINUX_CPUMASK_TYPES_H
+
+#include <linux/bitops.h>
+#include <linux/threads.h>
+
+/* Don't assign or return these: may not be this big! */
+typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
+
+/**
+ * cpumask_bits - get the bits in a cpumask
+ * @maskp: the struct cpumask *
+ *
+ * You should only assume nr_cpu_ids bits of this mask are valid. This is
+ * a macro so it's const-correct.
+ */
+#define cpumask_bits(maskp) ((maskp)->bits)
+
+/*
+ * cpumask_var_t: struct cpumask for stack usage.
+ *
+ * Oh, the wicked games we play! In order to make kernel coding a
+ * little more difficult, we typedef cpumask_var_t to an array or a
+ * pointer: doing &mask on an array is a noop, so it still works.
+ *
+ * i.e.
+ * cpumask_var_t tmpmask;
+ * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
+ * return -ENOMEM;
+ *
+ * ... use 'tmpmask' like a normal struct cpumask * ...
+ *
+ * free_cpumask_var(tmpmask);
+ *
+ *
+ * However, one notable exception is there. alloc_cpumask_var() allocates
+ * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
+ * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
+ *
+ * cpumask_var_t tmpmask;
+ * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
+ * return -ENOMEM;
+ *
+ * var = *tmpmask;
+ *
+ * This code makes NR_CPUS length memcopy and brings to a memory corruption.
+ * cpumask_copy() provide safe copy functionality.
+ *
+ * Note that there is another evil here: If you define a cpumask_var_t
+ * as a percpu variable then the way to obtain the address of the cpumask
+ * structure differently influences what this_cpu_* operation needs to be
+ * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
+ * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
+ * other type of cpumask_var_t implementation is configured.
+ *
+ * Please also note that __cpumask_var_read_mostly can be used to declare
+ * a cpumask_var_t variable itself (not its content) as read mostly.
+ */
+#ifdef CONFIG_CPUMASK_OFFSTACK
+typedef struct cpumask *cpumask_var_t;
+#else
+typedef struct cpumask cpumask_var_t[1];
+#endif /* CONFIG_CPUMASK_OFFSTACK */
+
+#endif /* __LINUX_CPUMASK_TYPES_H */
--
2.40.1
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