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Date: Wed, 3 Sep 2014 02:07:08 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: kmo@...erainc.com
Cc: Mark Rustad <mark.d.rustad@...el.com>,
linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH 1/2] md: Resolve shadow warnings
From: Mark Rustad <mark.d.rustad@...el.com>
Resolve shadow warnings caused by having the variable "ret"
in the RB_* macros, which matches the same local name in
functions that use the macros. Because these inner blocks
are defined in a macro, if the outer "ret" were passed to
the macro, madness would ensue. Reduce the hazard by prepending
an _ to the names of the inner block symbols, which seems to
be standard practice anyway.
Signed-off-by: Mark Rustad <mark.d.rustad@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/md/bcache/util.h | 80 ++++++++++++++++++++++++------------------------
1 file changed, 40 insertions(+), 40 deletions(-)
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index 98df757..508f68b 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -484,65 +484,65 @@ uint64_t bch_next_delay(struct bch_ratelimit *d, uint64_t done);
#define RB_INSERT(root, new, member, cmp) \
({ \
- __label__ dup; \
- struct rb_node **n = &(root)->rb_node, *parent = NULL; \
- typeof(new) this; \
- int res, ret = -1; \
+ __label__ _dup; \
+ struct rb_node **_n = &(root)->rb_node, *_parent = NULL; \
+ typeof(new) _this; \
+ int _res, _ret = -1; \
\
- while (*n) { \
- parent = *n; \
- this = container_of(*n, typeof(*(new)), member); \
- res = cmp(new, this); \
- if (!res) \
- goto dup; \
- n = res < 0 \
- ? &(*n)->rb_left \
- : &(*n)->rb_right; \
+ while (*_n) { \
+ _parent = *_n; \
+ _this = container_of(*_n, typeof(*(new)), member); \
+ _res = cmp(new, _this); \
+ if (!_res) \
+ goto _dup; \
+ _n = _res < 0 \
+ ? &(*_n)->rb_left \
+ : &(*_n)->rb_right; \
} \
\
- rb_link_node(&(new)->member, parent, n); \
+ rb_link_node(&(new)->member, _parent, _n); \
rb_insert_color(&(new)->member, root); \
- ret = 0; \
-dup: \
- ret; \
+ _ret = 0; \
+_dup: \
+ _ret; \
})
#define RB_SEARCH(root, search, member, cmp) \
({ \
- struct rb_node *n = (root)->rb_node; \
- typeof(&(search)) this, ret = NULL; \
- int res; \
+ struct rb_node *_n = (root)->rb_node; \
+ typeof(&(search)) _this, _ret = NULL; \
+ int _res; \
\
- while (n) { \
- this = container_of(n, typeof(search), member); \
- res = cmp(&(search), this); \
- if (!res) { \
- ret = this; \
+ while (_n) { \
+ _this = container_of(_n, typeof(search), member); \
+ _res = cmp(&(search), _this); \
+ if (!_res) { \
+ _ret = _this; \
break; \
} \
- n = res < 0 \
- ? n->rb_left \
- : n->rb_right; \
+ _n = _res < 0 \
+ ? _n->rb_left \
+ : _n->rb_right; \
} \
- ret; \
+ _ret; \
})
#define RB_GREATER(root, search, member, cmp) \
({ \
- struct rb_node *n = (root)->rb_node; \
- typeof(&(search)) this, ret = NULL; \
- int res; \
+ struct rb_node *_n = (root)->rb_node; \
+ typeof(&(search)) _this, _ret = NULL; \
+ int _res; \
\
- while (n) { \
- this = container_of(n, typeof(search), member); \
- res = cmp(&(search), this); \
- if (res < 0) { \
- ret = this; \
- n = n->rb_left; \
+ while (_n) { \
+ _this = container_of(_n, typeof(search), member); \
+ _res = cmp(&(search), _this); \
+ if (_res < 0) { \
+ _ret = _this; \
+ _n = _n->rb_left; \
} else \
- n = n->rb_right; \
+ _n = _n->rb_right; \
} \
- ret; \
+ _ret; \
})
#define RB_FIRST(root, type, member) \
--
1.9.3
--
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