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| author |   David Howells <dhowells@redhat.com> | 2007-02-05 16:21:08 -0800 |
|---|---|---|
| committer |   Roland Dreier <rolandd@cisco.com> | 2007-02-10 08:00:49 -0800 |
| commit | 6bdd61d876e6eacea5c59230b6b2d988b22793e6 (patch) | |
| tree | a375d2866f2e6a627ccbea90900bbd37ef10045b /usr | |
| parent | IPoIB: Connected mode experimental support (diff) | |
| download | linux-dev-6bdd61d876e6eacea5c59230b6b2d988b22793e6.tar.xz linux-dev-6bdd61d876e6eacea5c59230b6b2d988b22793e6.zip | |
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 'usr')
0 files changed, 0 insertions, 0 deletions