linux-kernel - [PATCH 01/10] cpumask: Introduce cpumask_any_online

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed,  3 Jun 2015 12:09:52 -0700
From:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	vikas.shivappa@...el.com, x86@...nel.org, hpa@...or.com,
	tglx@...utronix.de, mingo@...nel.org, tj@...nel.org,
	peterz@...radead.org, matt.fleming@...el.com, will.auld@...el.com,
	kanaka.d.juvva@...el.com, vikas.shivappa@...ux.intel.com
Subject: [PATCH 01/10] cpumask: Introduce cpumask_any_online_but

There is currently no cpumask helper function to pick a "random" cpu
from a mask which is also online.

cpumask_any_online_but() does that which is similar to cpumask_any_but()
but also returns a cpu that is online.

Signed-off-by: Vikas Shivappa <vikas.shivappa@...ux.intel.com>
---
 include/linux/cpumask.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 27e285b..f2d7e8a 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -548,6 +548,24 @@ static inline void cpumask_copy(struct cpumask *dstp,
 #define cpumask_of(cpu) (get_cpu_mask(cpu))
 
 /**
+ * cpumask_any_online_but - return a "random"  and online cpu in a cpumask,
+ * but not this one
+ * @mask: the input mask to search
+ * @cpu: the cpu to ignore
+ *
+ * Returns >= nr_cpu_ids if no cpus set.
+*/
+static inline unsigned int cpumask_any_online_but(const struct cpumask *mask,
+					   unsigned int cpu)
+{
+	cpumask_t tmp;
+
+	cpumask_and(&tmp, cpu_online_mask, mask);
+	cpumask_clear_cpu(cpu, &tmp);
+	return cpumask_any(&tmp);
+}
+
+/**
  * cpumask_parse_user - extract a cpumask from a user string
  * @buf: the buffer to extract from
  * @len: the length of the buffer
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/