path: root/drivers/infiniband
diff options
authorDavid Howells <dhowells@redhat.com>2007-02-05 16:21:08 -0800
committerRoland Dreier <rolandd@cisco.com>2007-02-10 08:00:49 -0800
commit6bdd61d876e6eacea5c59230b6b2d988b22793e6 (patch)
treea375d2866f2e6a627ccbea90900bbd37ef10045b /drivers/infiniband
parentIPoIB: Connected mode experimental support (diff)
IB/mthca: Work around gcc bug on sparc64
For some reason gcc-3.4.5 on sparc64 does: WARNING: "____ilog2_NaN" [drivers/infiniband/hw/mthca/ib_mthca.ko] undefined! Points to note: (1) The asm volatile flush/flushw are just markers for viewing what comes out in the assembly; removing them has no effect on the result. (2) Changing almost anything else in dwh__mthca_arbel_init_srq_context() or dwh__mthca_alloc_srq() causes the problem to go away. The compiler command line issued by the kernel build is: /opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/bin/sparc64-unknown-linux-gnu-gcc -fno-strict-aliasing -fno-common -Os -m64 -mno-fpu -mcpu=ultrasparc -mcmodel=medlow -ffixed-g4 -ffixed-g5 -fcall-used-g7 -Wa,--undeclared-regs -pg -fno-omit-frame-pointer -fno-optimize-sibling-calls -fasynchronous-unwind-tables -g -c -o drivers/infiniband/hw/mthca/.tmp_mthca_srq.o drivers/infiniband/hw/mthca/mthca_srq.c This can be reduced to this whilst still retaining the problem: /opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/bin/sparc64-unknown-linux-gnu-gcc -m64 -c -o drivers/infiniband/hw/mthca/mthca_srq.o drivers/infiniband/hw/mthca/mthca_srq.c -Os Removing -Os or changing it to -O or -O0 thru -O6 gets rid of the problem. This patch to the kernel code fixes the problem: Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 10684da33d58..61974b0296ca 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -116,11 +116,16 @@ static void mthca_arbel_init_srq_context(struct mthca_dev *dev,
struct mthca_srq *srq,
struct mthca_arbel_srq_context *context)
- int logsize;
+ int logsize, max;
memset(context, 0, sizeof *context);
- logsize = ilog2(srq->max);
+ /*
+ * Put max in a temporary variable to work around gcc bug
+ * triggered by ilog2() on sparc64.
+ */
+ max = srq->max;
+ logsize = ilog2(max);
context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn);
context->lkey = cpu_to_be32(srq->mr.ibmr.lkey);
context->db_index = cpu_to_be32(srq->db_index);