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From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>, "dev@dpdk.org" <dev@dpdk.org>
CC: "stable@dpdk.org" <stable@dpdk.org>, nd <nd@arm.com>, Honnappa Nagarahalli
<Honnappa.Nagarahalli@arm.com>, nd <nd@arm.com>
Thread-Topic: [PATCH v2] lib/rcu: avoid literal suffix warning in C++ mode
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Date: Sat, 5 Sep 2020 01:47:40 +0000
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Subject: Re: [dpdk-dev] [PATCH v2] lib/rcu: avoid literal suffix warning in
C++ mode
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<snip>
>=20
> Sequences like "value =3D %"PRIu64 (no space before PRIu64) are parsed as=
a
> single preprocessor token, user-defined-string-literal, in C++11 onwards.
> While modern compilers are smart enough to parse this properly, GCC 9.3.0
> generates warnings like:
>=20
> rte_rcu_qsbr.h:555:26: warning: invalid suffix on literal; C++11
> requires a space between literal and string macro [-Wliteral-suffix]
>=20
> Add spaces around format specifier macros to make public headers
> compatible with C++ without causing warnings. Make similar changes in C
> source for style consistency within the library.
>=20
> Fixes: 64994b56c ("rcu: add RCU library supporting QSBR mechanism")
> Cc: stable@dpdk.org
>=20
> Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
Looks good, Thank you.
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> ---
>=20
> v2: fix subject line, adjust C source for style consistency.
>=20
> lib/librte_rcu/rte_rcu_qsbr.c | 13 +++++++------
> lib/librte_rcu/rte_rcu_qsbr.h | 14 +++++++-------
> 2 files changed, 14 insertions(+), 13 deletions(-)
>=20
> diff --git a/lib/librte_rcu/rte_rcu_qsbr.c b/lib/librte_rcu/rte_rcu_qsbr.=
c index
> aebfdb0da..a5f9de326 100644
> --- a/lib/librte_rcu/rte_rcu_qsbr.c
> +++ b/lib/librte_rcu/rte_rcu_qsbr.c
> @@ -244,10 +244,10 @@ rte_rcu_qsbr_dump(FILE *f, struct rte_rcu_qsbr *v)
>=20
> fprintf(f, "\n");
>=20
> - fprintf(f, " Token =3D %"PRIu64"\n",
> + fprintf(f, " Token =3D %" PRIu64 "\n",
> __atomic_load_n(&v->token, __ATOMIC_ACQUIRE));
>=20
> - fprintf(f, " Least Acknowledged Token =3D %"PRIu64"\n",
> + fprintf(f, " Least Acknowledged Token =3D %" PRIu64 "\n",
> __atomic_load_n(&v->acked_token,
> __ATOMIC_ACQUIRE));
>=20
> fprintf(f, "Quiescent State Counts for readers:\n"); @@ -257,7 +257,7
> @@ rte_rcu_qsbr_dump(FILE *f, struct rte_rcu_qsbr *v)
> id =3D i << __RTE_QSBR_THRID_INDEX_SHIFT;
> while (bmap) {
> t =3D __builtin_ctzl(bmap);
> - fprintf(f, "thread ID =3D %u, count =3D %"PRIu64", lock
> count =3D %u\n",
> + fprintf(f, "thread ID =3D %u, count =3D %" PRIu64 ", lock
> count =3D %u\n",
> id + t,
> __atomic_load_n(
> &v->qsbr_cnt[id + t].cnt,
> @@ -402,7 +402,7 @@ int rte_rcu_qsbr_dq_enqueue(struct
> rte_rcu_qsbr_dq *dq, void *e)
> * other issues.
> */
> rte_log(RTE_LOG_INFO, rte_rcu_log_type,
> - "%s(): Skipped enqueuing token =3D %"PRIu64"\n",
> + "%s(): Skipped enqueuing token =3D %" PRIu64 "\n",
> __func__, dq_elem->token);
>=20
> rte_errno =3D ENOSPC;
> @@ -410,7 +410,8 @@ int rte_rcu_qsbr_dq_enqueue(struct
> rte_rcu_qsbr_dq *dq, void *e)
> }
>=20
> rte_log(RTE_LOG_INFO, rte_rcu_log_type,
> - "%s(): Enqueued token =3D %"PRIu64"\n", __func__, dq_elem-
> >token);
> + "%s(): Enqueued token =3D %" PRIu64 "\n",
> + __func__, dq_elem->token);
>=20
> return 0;
> }
> @@ -449,7 +450,7 @@ rte_rcu_qsbr_dq_reclaim(struct rte_rcu_qsbr_dq
> *dq, unsigned int n,
> rte_ring_dequeue_elem_finish(dq->r, 1);
>=20
> rte_log(RTE_LOG_INFO, rte_rcu_log_type,
> - "%s(): Reclaimed token =3D %"PRIu64"\n",
> + "%s(): Reclaimed token =3D %" PRIu64 "\n",
> __func__, dq_elem->token);
>=20
> dq->free_fn(dq->p, dq_elem->elem, 1); diff --git
> a/lib/librte_rcu/rte_rcu_qsbr.h b/lib/librte_rcu/rte_rcu_qsbr.h index
> a98e8f0f8..aa237cf75 100644
> --- a/lib/librte_rcu/rte_rcu_qsbr.h
> +++ b/lib/librte_rcu/rte_rcu_qsbr.h
> @@ -552,7 +552,7 @@ rte_rcu_qsbr_quiescent(struct rte_rcu_qsbr *v,
> unsigned int thread_id)
> __atomic_store_n(&v->qsbr_cnt[thread_id].cnt,
> t, __ATOMIC_RELEASE);
>=20
> - __RTE_RCU_DP_LOG(DEBUG, "%s: update: token =3D %"PRIu64",
> Thread ID =3D %d",
> + __RTE_RCU_DP_LOG(DEBUG, "%s: update: token =3D %" PRIu64 ",
> Thread ID =3D
> +%d",
> __func__, t, thread_id);
> }
>=20
> @@ -580,13 +580,13 @@ __rte_rcu_qsbr_check_selective(struct
> rte_rcu_qsbr *v, uint64_t t, bool wait)
> while (bmap) {
> j =3D __builtin_ctzl(bmap);
> __RTE_RCU_DP_LOG(DEBUG,
> - "%s: check: token =3D %"PRIu64", wait =3D %d, Bit
> Map =3D 0x%"PRIx64", Thread ID =3D %d",
> + "%s: check: token =3D %" PRIu64 ", wait =3D %d,
> Bit Map =3D 0x%" PRIx64
> +", Thread ID =3D %d",
> __func__, t, wait, bmap, id + j);
> c =3D __atomic_load_n(
> &v->qsbr_cnt[id + j].cnt,
> __ATOMIC_ACQUIRE);
> __RTE_RCU_DP_LOG(DEBUG,
> - "%s: status: token =3D %"PRIu64", wait =3D %d,
> Thread QS cnt =3D %"PRIu64", Thread ID =3D %d",
> + "%s: status: token =3D %" PRIu64 ", wait =3D %d,
> Thread QS cnt =3D %"
> +PRIu64 ", Thread ID =3D %d",
> __func__, t, wait, c, id+j);
>=20
> /* Counter is not checked for wrap-around condition
> @@ -643,12 +643,12 @@ __rte_rcu_qsbr_check_all(struct rte_rcu_qsbr *v,
> uint64_t t, bool wait)
>=20
> for (i =3D 0, cnt =3D v->qsbr_cnt; i < v->max_threads; i++, cnt++) {
> __RTE_RCU_DP_LOG(DEBUG,
> - "%s: check: token =3D %"PRIu64", wait =3D %d, Thread ID
> =3D %d",
> + "%s: check: token =3D %" PRIu64 ", wait =3D %d, Thread
> ID =3D %d",
> __func__, t, wait, i);
> while (1) {
> c =3D __atomic_load_n(&cnt->cnt,
> __ATOMIC_ACQUIRE);
> __RTE_RCU_DP_LOG(DEBUG,
> - "%s: status: token =3D %"PRIu64", wait =3D %d,
> Thread QS cnt =3D %"PRIu64", Thread ID =3D %d",
> + "%s: status: token =3D %" PRIu64 ", wait =3D %d,
> Thread QS cnt =3D %"
> +PRIu64 ", Thread ID =3D %d",
> __func__, t, wait, c, i);
>=20
> /* Counter is not checked for wrap-around condition
> @@ -725,10 +725,10 @@ rte_rcu_qsbr_check(struct rte_rcu_qsbr *v,
> uint64_t t, bool wait)
> /* Check if all the readers have already acknowledged this token */
> if (likely(t <=3D v->acked_token)) {
> __RTE_RCU_DP_LOG(DEBUG,
> - "%s: check: token =3D %"PRIu64", wait =3D %d",
> + "%s: check: token =3D %" PRIu64 ", wait =3D %d",
> __func__, t, wait);
> __RTE_RCU_DP_LOG(DEBUG,
> - "%s: status: least acked token =3D %"PRIu64"",
> + "%s: status: least acked token =3D %" PRIu64,
> __func__, v->acked_token);
> return 1;
> }
> --
> 2.25.4