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authorSteven Rostedt <srostedt@redhat.com>2009-09-14 09:31:35 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-09-14 09:41:57 -0400
commit08a408161749d2406f94f4e3d47cfdbc826ad1cc (patch)
tree6132140fe47c4825159dda8f8f438ac8baae6055 /kernel/trace/ring_buffer.c
parent60ba77022712c7cda0eda286154bae160446b24a (diff)
ring-buffer: typecast cmpxchg to fix PowerPC warning
The cmpxchg used by PowerPC does the following: ({ \ __typeof__(*(ptr)) _o_ = (o); \ __typeof__(*(ptr)) _n_ = (n); \ (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ (unsigned long)_n_, sizeof(*(ptr))); \ }) This does a type check of *ptr to both o and n. Unfortunately, the code in ring-buffer.c assigns longs to pointers and pointers to longs and causes a warning on PowerPC: ring_buffer.c: In function 'rb_head_page_set': ring_buffer.c:704: warning: initialization makes pointer from integer without a cast ring_buffer.c:704: warning: initialization makes pointer from integer without a cast ring_buffer.c: In function 'rb_head_page_replace': ring_buffer.c:797: warning: initialization makes integer from pointer without a cast This patch adds the typecasts inside cmpxchg to annotate that a long is being cast to a pointer and a pointer is being casted to a long and this removes the PowerPC warnings. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ring_buffer.c')
-rw-r--r--kernel/trace/ring_buffer.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 8786c350b4c..6eef38923b0 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -701,8 +701,8 @@ static int rb_head_page_set(struct ring_buffer_per_cpu *cpu_buffer,
val &= ~RB_FLAG_MASK;
- ret = (unsigned long)cmpxchg(&list->next,
- val | old_flag, val | new_flag);
+ ret = cmpxchg((unsigned long *)&list->next,
+ val | old_flag, val | new_flag);
/* check if the reader took the page */
if ((ret & ~RB_FLAG_MASK) != val)
@@ -794,7 +794,7 @@ static int rb_head_page_replace(struct buffer_page *old,
val = *ptr & ~RB_FLAG_MASK;
val |= RB_PAGE_HEAD;
- ret = cmpxchg(ptr, val, &new->list);
+ ret = cmpxchg(ptr, val, (unsigned long)&new->list);
return ret == val;
}