From: Ming Lei <ming.lei@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>, Jens Axboe <axboe@kernel.dk>
Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
Christoph Hellwig <hch@lst.de>, Ming Lei <ming.lei@redhat.com>
Subject: [PATCH V3 6/7] lib/group_cpus: allow to group cpus in case of !CONFIG_SMP
Date: Tue, 28 Sep 2021 08:55:57 +0800 [thread overview]
Message-ID: <20210928005558.243352-7-ming.lei@redhat.com> (raw)
In-Reply-To: <20210928005558.243352-1-ming.lei@redhat.com>
Allows group_cpus_evenly() to be called in case of !CONFIG_SMP by simply
assigning all CPUs into the 1st group.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
lib/Makefile | 2 +-
lib/group_cpus.c | 14 ++++++++++++++
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/lib/Makefile b/lib/Makefile
index ff1cbe4958a1..3dbdc7f01215 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -338,7 +338,7 @@ obj-$(CONFIG_SBITMAP) += sbitmap.o
obj-$(CONFIG_PARMAN) += parman.o
-obj-$(CONFIG_SMP) += group_cpus.o
+obj-y += group_cpus.o
# GCC library routines
obj-$(CONFIG_GENERIC_LIB_ASHLDI3) += ashldi3.o
diff --git a/lib/group_cpus.c b/lib/group_cpus.c
index f7165b38c9d0..b34f7d309f9c 100644
--- a/lib/group_cpus.c
+++ b/lib/group_cpus.c
@@ -327,6 +327,7 @@ static int __group_cpus_evenly(unsigned int startgrp, unsigned int numgrps,
return done;
}
+#ifdef CONFIG_SMP
/**
* group_cpus_evenly - Group all CPUs evenly per NUMA/CPU locality
* @numgrps: number of groups
@@ -411,4 +412,17 @@ struct cpumask *group_cpus_evenly(unsigned int numgrps)
}
return masks;
}
+#else
+struct cpumask *group_cpus_evenly(unsigned int numgrps)
+{
+ struct cpumask *masks = kcalloc(numgrps, sizeof(*masks), GFP_KERNEL);
+
+ if (!masks)
+ return NULL;
+
+ /* assign all CPUs(cpu 0) to the 1st group only */
+ cpumask_copy(&masks[0], cpu_possible_mask);
+ return masks;
+}
+#endif
EXPORT_SYMBOL_GPL(group_cpus_evenly);
--
2.31.1
next prev parent reply other threads:[~2021-09-28 0:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-28 0:55 [PATCH V3 0/7] genirq/affinity: abstract new API from managed irq affinity spread Ming Lei
2021-09-28 0:55 ` [PATCH V3 1/7] genirq/affinity: remove the 'firstvec' parameter from irq_build_affinity_masks Ming Lei
2021-09-28 0:55 ` [PATCH V3 2/7] genirq/affinity: pass affinity managed mask array to irq_build_affinity_masks Ming Lei
2021-09-28 0:55 ` [PATCH V3 3/7] genirq/affinity: don't pass irq_affinity_desc " Ming Lei
2021-09-28 0:55 ` [PATCH V3 4/7] genirq/affinity: rename irq_build_affinity_masks as group_cpus_evenly Ming Lei
2021-09-28 0:55 ` [PATCH V3 5/7] genirq/affinity: move group_cpus_evenly() into lib/ Ming Lei
2021-09-28 5:26 ` Christoph Hellwig
2021-09-29 14:40 ` John Garry
2021-09-30 0:05 ` Ming Lei
2021-09-28 0:55 ` Ming Lei [this message]
2021-09-28 5:27 ` [PATCH V3 6/7] lib/group_cpus: allow to group cpus in case of !CONFIG_SMP Christoph Hellwig
2021-09-28 0:55 ` [PATCH V3 7/7] blk-mq: build default queue map via group_cpus_evenly() Ming Lei
2021-09-28 5:27 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210928005558.243352-7-ming.lei@redhat.com \
--to=ming.lei@redhat.com \
--cc=axboe@kernel.dk \
--cc=hch@lst.de \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.