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14351f08ed
gcc 8.3 and 5.4 throw this:
In function 'modify_qp_init_to_rtr',
././include/linux/compiler_types.h:322:38: error: call to '__compiletime_assert_1859' declared with attribute error: FIELD_PREP: value too large for the field
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
[..]
drivers/infiniband/hw/hns/hns_roce_common.h:91:52: note: in expansion of macro 'FIELD_PREP'
*((__le32 *)ptr + (field_h) / 32) |= cpu_to_le32(FIELD_PREP( \
^~~~~~~~~~
drivers/infiniband/hw/hns/hns_roce_common.h:95:39: note: in expansion of macro '_hr_reg_write'
#define hr_reg_write(ptr, field, val) _hr_reg_write(ptr, field, val)
^~~~~~~~~~~~~
drivers/infiniband/hw/hns/hns_roce_hw_v2.c:4412:2: note: in expansion of macro 'hr_reg_write'
hr_reg_write(context, QPC_LP_PKTN_INI, lp_pktn_ini);
Because gcc has miscalculated the constantness of lp_pktn_ini:
mtu = ib_mtu_enum_to_int(ib_mtu);
if (WARN_ON(mtu < 0)) [..]
lp_pktn_ini = ilog2(MAX_LP_MSG_LEN / mtu);
Since mtu is limited to {256,512,1024,2048,4096} lp_pktn_ini is between 4
and 8 which is compatible with the 4 bit field in the FIELD_PREP.
Work around this broken compiler by adding a 'can never be true'
constraint on lp_pktn_ini's value which clears out the problem.
Fixes:
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|---|---|---|
| .. | ||
| hns_roce_ah.c | ||
| hns_roce_alloc.c | ||
| hns_roce_cmd.c | ||
| hns_roce_cmd.h | ||
| hns_roce_common.h | ||
| hns_roce_cq.c | ||
| hns_roce_db.c | ||
| hns_roce_device.h | ||
| hns_roce_hem.c | ||
| hns_roce_hem.h | ||
| hns_roce_hw_v1.c | ||
| hns_roce_hw_v1.h | ||
| hns_roce_hw_v2_dfx.c | ||
| hns_roce_hw_v2.c | ||
| hns_roce_hw_v2.h | ||
| hns_roce_main.c | ||
| hns_roce_mr.c | ||
| hns_roce_pd.c | ||
| hns_roce_qp.c | ||
| hns_roce_restrack.c | ||
| hns_roce_srq.c | ||
| Kconfig | ||
| Makefile | ||