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From: Julia Cartwright <julia@ni.com>
To: <bigeasy@linutronix.de>, <tglx@linutronix.de>
Cc: <linux-rt-users@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	"Phillip Lougher" <phillip@squashfs.org.uk>,
	Alexander Stein <alexander.stein@systec-electronic.com>
Subject: [PATCH RT 1/2] locallock: provide {get,put}_locked_ptr() variants
Date: Mon, 7 May 2018 08:58:56 -0500	[thread overview]
Message-ID: <20180507135857.7565-1-julia@ni.com> (raw)
In-Reply-To: <4064553.Shs7ScuBS6@ws-stein>

Provide a set of locallocked accessors for pointers to per-CPU data;
this is useful for dynamically-allocated per-CPU regions, for example.

These are symmetric with the {get,put}_cpu_ptr() per-CPU accessor
variants.

Signed-off-by: Julia Cartwright <julia@ni.com>
---
 include/linux/locallock.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/locallock.h b/include/linux/locallock.h
index d658c2552601..921eab83cd34 100644
--- a/include/linux/locallock.h
+++ b/include/linux/locallock.h
@@ -222,6 +222,14 @@ static inline int __local_unlock_irqrestore(struct local_irq_lock *lv,
 
 #define put_locked_var(lvar, var)	local_unlock(lvar);
 
+#define get_locked_ptr(lvar, var)					\
+	({								\
+		local_lock(lvar);					\
+		this_cpu_ptr(var);					\
+	})
+
+#define put_locked_ptr(lvar, var)	local_unlock(lvar);
+
 #define local_lock_cpu(lvar)						\
 	({								\
 		local_lock(lvar);					\
@@ -262,6 +270,8 @@ static inline void local_irq_lock_init(int lvar) { }
 
 #define get_locked_var(lvar, var)		get_cpu_var(var)
 #define put_locked_var(lvar, var)		put_cpu_var(var)
+#define get_locked_ptr(lvar, var)		get_cpu_ptr(var)
+#define put_locked_ptr(lvar, var)		put_cpu_ptr(var)
 
 #define local_lock_cpu(lvar)			get_cpu()
 #define local_unlock_cpu(lvar)			put_cpu()
-- 
2.17.0

  reply	other threads:[~2018-05-07 13:57 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-02 13:12 [PATCH 1/1] squashfs: Disable "percpu multiple decompressor" on RT Alexander Stein
2018-05-02 14:37 ` Julia Cartwright
2018-05-03  6:36   ` Alexander Stein
2018-05-03 15:48     ` Julia Cartwright
2018-05-07  6:09       ` Alexander Stein
2018-05-07 13:58         ` Julia Cartwright [this message]
2018-05-07 13:58           ` [PATCH RT 2/2] squashfs: make use of local lock in multi_cpu decompressor Julia Cartwright

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