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author | Roland Dreier <rolandd@cisco.com> | 2007-07-18 06:30:51 +0400 |
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committer | Roland Dreier <rolandd@cisco.com> | 2007-07-18 06:30:51 +0400 |
commit | 6d7d080e9f7cd535a8821efd3835c5cfa5223ab6 (patch) | |
tree | 62221b14658a7eeb9a34f258bfc91ec7e5079de2 /drivers/infiniband | |
parent | 454a01e7f486279b0bf8979d94203ab7a503e053 (diff) | |
download | linux-6d7d080e9f7cd535a8821efd3835c5cfa5223ab6.tar.xz |
IB/mthca: Use uninitialized_var() for f0
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>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r-- | drivers/infiniband/hw/mthca/mthca_qp.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c index 11f1d99db40b..0e9ef24f6638 100644 --- a/drivers/infiniband/hw/mthca/mthca_qp.c +++ b/drivers/infiniband/hw/mthca/mthca_qp.c @@ -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; |