linux-kernel - [PATCH] iommu: replace single-char identifiers in macros

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Message-Id: <1559566783-13627-1-git-send-email-cai@lca.pw>
Date:   Mon,  3 Jun 2019 08:59:43 -0400
From:   Qian Cai <cai@....pw>
To:     jroedel@...e.de
Cc:     akpm@...ux-foundation.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: [PATCH] iommu: replace single-char identifiers in macros

There are a few macros in IOMMU have single-char identifiers make the
code hard to read and debug. Replace them with meaningful names.

Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Qian Cai <cai@....pw>
---
 include/linux/dmar.h | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index f8af1d770520..eb634912f475 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -104,12 +104,14 @@ static inline bool dmar_rcu_check(void)
 
 #define	dmar_rcu_dereference(p)	rcu_dereference_check((p), dmar_rcu_check())
 
-#define	for_each_dev_scope(a, c, p, d)	\
-	for ((p) = 0; ((d) = (p) < (c) ? dmar_rcu_dereference((a)[(p)].dev) : \
-			NULL, (p) < (c)); (p)++)
-
-#define	for_each_active_dev_scope(a, c, p, d)	\
-	for_each_dev_scope((a), (c), (p), (d))	if (!(d)) { continue; } else
+#define for_each_dev_scope(devs, cnt, i, tmp)				\
+	for ((i) = 0; ((tmp) = (i) < (cnt) ?				\
+	    dmar_rcu_dereference((devs)[(i)].dev) : NULL, (i) < (cnt)); \
+	    (i)++)
+
+#define for_each_active_dev_scope(devs, cnt, i, tmp)			\
+	for_each_dev_scope((devs), (cnt), (i), (tmp))			\
+		if (!(tmp)) { continue; } else
 
 extern int dmar_table_init(void);
 extern int dmar_dev_scope_init(void);
-- 
1.8.3.1