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IB/mthca: Use uninitialized_var() for f0

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Commit 9db48926 ("drivers/infiniband/hw/mthca/mthca_qp: kill uninit'd
var warning") added "= 0" to the declarations of f0 to shut up gcc
warnings.  However, there's no point in making the code bigger by
initializing f0 to a random value just to get rid of a warning;
setting f0 to 0 is no safer than just using uninitialized_var(), which
documents the situation better and gives smaller code too.  For example, 
on x86_64:

add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-16 (-16)
function                                     old     new   delta
mthca_tavor_post_send                       1352    1344      -8
mthca_arbel_post_send                       1489    1481      -8

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2007-07-17 19:30:51 -07:00
parent 454a01e7f4
commit 6d7d080e9f
1 changed files with 14 additions and 2 deletions
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16
drivers/infiniband/hw/mthca/mthca_qp.c
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@ -1591,7 +1591,13 @@ int mthca_tavor_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
int i;
int size;
int size0 = 0;
u32 f0 = 0;
/*
* f0 is only used if nreq != 0, and f0 will be initialized
* the first time through the main loop, since size0 == 0 the
* first time through. So nreq cannot become non-zero without
* initializing f0, and f0 is in fact never used uninitialized.
*/
u32 uninitialized_var(f0);
int ind;
u8 op0 = 0;
@ -1946,7 +1952,13 @@ int mthca_arbel_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
int i;
int size;
int size0 = 0;
u32 f0 = 0;
/*
* f0 is only used if nreq != 0, and f0 will be initialized
* the first time through the main loop, since size0 == 0 the
* first time through. So nreq cannot become non-zero without
* initializing f0, and f0 is in fact never used uninitialized.
*/
u32 uninitialized_var(f0);
int ind;
u8 op0 = 0;