lkml.org 
[lkml]   [2022]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5/5] lib/nodemask: inline next_node_in() and node_random()
Date
The functions are pretty thin wrappers around find_bit engine, and
keeping them in c-file prevents compiler from small_const_nbits()
optimization, which must take place for all systems with MAX_NUMNODES
less than BITS_PER_LONG (default is 16 for me).

Moving them in header file doesn't blow up the kernel size:
add/remove: 1/2 grow/shrink: 9/5 up/down: 968/-88 (880)

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
MAINTAINERS | 1 -
include/linux/nodemask.h | 27 ++++++++++++++++++++++-----
lib/Makefile | 2 +-
lib/nodemask.c | 30 ------------------------------
4 files changed, 23 insertions(+), 37 deletions(-)
delete mode 100644 lib/nodemask.c

diff --git a/MAINTAINERS b/MAINTAINERS
index f808826509e5..314dd1054246 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3540,7 +3540,6 @@ F: lib/bitmap.c
F: lib/cpumask.c
F: lib/find_bit.c
F: lib/find_bit_benchmark.c
-F: lib/nodemask.c
F: lib/test_bitmap.c
F: tools/include/linux/bitmap.h
F: tools/include/linux/find.h
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 0f233b76c9ce..48ebe4007955 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -94,6 +94,7 @@
#include <linux/bitmap.h>
#include <linux/minmax.h>
#include <linux/numa.h>
+#include <linux/random.h>

typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
extern nodemask_t _unused_nodemask_arg_;
@@ -276,7 +277,14 @@ static inline unsigned int __next_node(int n, const nodemask_t *srcp)
* the first node in src if needed. Returns MAX_NUMNODES if src is empty.
*/
#define next_node_in(n, src) __next_node_in((n), &(src))
-unsigned int __next_node_in(int node, const nodemask_t *srcp);
+static inline unsigned int __next_node_in(int node, const nodemask_t *srcp)
+{
+ unsigned int ret = __next_node(node, srcp);
+
+ if (ret == MAX_NUMNODES)
+ ret = __first_node(srcp);
+ return ret;
+}

static inline void init_nodemask_of_node(nodemask_t *mask, int node)
{
@@ -493,14 +501,23 @@ static inline int num_node_state(enum node_states state)

#endif

+/*
+ * Return the bit number of a random bit set in the nodemask.
+ * (returns NUMA_NO_NODE if nodemask is empty)
+ */
+static inline int node_random(const nodemask_t *maskp)
+{
#if defined(CONFIG_NUMA) && (MAX_NUMNODES > 1)
-extern int node_random(const nodemask_t *maskp);
+ int w, bit = NUMA_NO_NODE;
+
+ w = nodes_weight(*maskp);
+ if (w)
+ bit = find_nth_bit(maskp->bits, MAX_NUMNODES, get_random_int() % w + 1);
+ return bit;
#else
-static inline int node_random(const nodemask_t *mask)
-{
return 0;
-}
#endif
+}

#define node_online_map node_states[N_ONLINE]
#define node_possible_map node_states[N_POSSIBLE]
diff --git a/lib/Makefile b/lib/Makefile
index f99bf61f8bbc..731cea0342d1 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -33,7 +33,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
flex_proportions.o ratelimit.o show_mem.o \
is_single_threaded.o plist.o decompress.o kobject_uevent.o \
earlycpio.o seq_buf.o siphash.o dec_and_lock.o \
- nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o \
+ nmi_backtrace.o win_minmax.o memcat_p.o \
buildid.o

lib-$(CONFIG_PRINTK) += dump_stack.o
diff --git a/lib/nodemask.c b/lib/nodemask.c
deleted file mode 100644
index 7dad4ce8ff59..000000000000
--- a/lib/nodemask.c
+++ /dev/null
@@ -1,30 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/nodemask.h>
-#include <linux/module.h>
-#include <linux/random.h>
-
-unsigned int __next_node_in(int node, const nodemask_t *srcp)
-{
- unsigned int ret = __next_node(node, srcp);
-
- if (ret == MAX_NUMNODES)
- ret = __first_node(srcp);
- return ret;
-}
-EXPORT_SYMBOL(__next_node_in);
-
-#ifdef CONFIG_NUMA
-/*
- * Return the bit number of a random bit set in the nodemask.
- * (returns NUMA_NO_NODE if nodemask is empty)
- */
-int node_random(const nodemask_t *maskp)
-{
- int w, bit = NUMA_NO_NODE;
-
- w = nodes_weight(*maskp);
- if (w)
- bit = find_nth_bit(maskp->bits, MAX_NUMNODES, get_random_int() % w + 1);
- return bit;
-}
-#endif
--
2.34.1
\
 
 \ /
  Last update: 2022-07-06 20:25    [W:0.064 / U:0.564 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site