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author | Steven Rostedt <srostedt@redhat.com> | 2009-09-14 09:31:35 -0400 |
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committer | Steven Rostedt <rostedt@goodmis.org> | 2009-09-14 09:41:57 -0400 |
commit | 08a408161749d2406f94f4e3d47cfdbc826ad1cc (patch) | |
tree | 6132140fe47c4825159dda8f8f438ac8baae6055 /kernel/trace/trace_events.c | |
parent | 60ba77022712c7cda0eda286154bae160446b24a (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/trace_events.c')
0 files changed, 0 insertions, 0 deletions