The patch titled
infiniband: work around gcc bug on sparc64
has been added to the -mm tree. Its filename is
infiniband-work-around-gcc-bug-on-sparc64.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: infiniband: work around gcc bug on sparc64
From: David Howells <dhowells@xxxxxxxxxx>
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: Roland Dreier <rdreier@xxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/infiniband/hw/mthca/mthca_srq.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff -puN drivers/infiniband/hw/mthca/mthca_srq.c~infiniband-work-around-gcc-bug-on-sparc64 drivers/infiniband/hw/mthca/mthca_srq.c
--- a/drivers/infiniband/hw/mthca/mthca_srq.c~infiniband-work-around-gcc-bug-on-sparc64
+++ a/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -116,11 +116,12 @@ static void mthca_arbel_init_srq_context
struct mthca_srq *srq,
struct mthca_arbel_srq_context *context)
{
- int logsize;
+ int logsize, max;
memset(context, 0, sizeof *context);
- logsize = ilog2(srq->max);
+ 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);
_
Patches currently in -mm which might be from dhowells@xxxxxxxxxx are
origin.patch
ieee80211softmac-fix-errors-related-to-the-work_struct-changes.patch
fix-more-workqueue-build-breakage-tps65010.patch
log2-make-powerpcs-__ilog2_u64-take-a-64-bit-argument.patch
infiniband-work-around-gcc-bug-on-sparc64.patch
alsa-workqueue-fixes.patch
nfs-represent-64-bit-fileids-as-64-bit-inode-numbers-on-32-bit-systems.patch
pm-fix-smp-races-in-the-freezer.patch
doc-atomic_add_unless-doesnt-imply-mb-on-failure.patch
ecryptfs-public-key-transport-mechanism.patch
ecryptfs-public-key-packet-management.patch
workstruct-implement-generic-up-cmpxchg-where-an-arch-doesnt-support-it.patch
workqueue-dont-hold-workqueue_mutex-in-flush_scheduled_work.patch
reiser4-get_sb_dev-fix.patch
mutex-subsystem-synchro-test-module.patch
-
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