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Date: Wed, 8 Jul 2020 08:47:03 +0300
From: Leon Romanovsky <leon@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Mike Marciniszyn <mike.marciniszyn@...el.com>,
Dennis Dalessandro <dennis.dalessandro@...el.com>,
Doug Ledford <dledford@...hat.com>,
Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] IB/hfi1: Use fallthrough pseudo-keyword
On Tue, Jul 07, 2020 at 12:39:42PM -0500, Gustavo A. R. Silva wrote:
> Replace the existing /* fall through */ comments and its variants with
> the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
> fall-through markings when it is the case.
>
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
> drivers/infiniband/hw/hfi1/chip.c | 8 ++++----
> drivers/infiniband/hw/hfi1/firmware.c | 16 ----------------
> drivers/infiniband/hw/hfi1/mad.c | 9 ++++-----
> drivers/infiniband/hw/hfi1/pio.c | 2 +-
> drivers/infiniband/hw/hfi1/pio_copy.c | 12 ++++++------
> drivers/infiniband/hw/hfi1/platform.c | 10 +++++-----
> drivers/infiniband/hw/hfi1/qp.c | 2 +-
> drivers/infiniband/hw/hfi1/qsfp.c | 4 ++--
> drivers/infiniband/hw/hfi1/rc.c | 25 ++++++++++++-------------
> drivers/infiniband/hw/hfi1/sdma.c | 9 ++++-----
> drivers/infiniband/hw/hfi1/tid_rdma.c | 4 ++--
> drivers/infiniband/hw/hfi1/uc.c | 8 ++++----
> 12 files changed, 45 insertions(+), 64 deletions(-)
>
> diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
> index 15f9c635f292..132f1df6f23b 100644
> --- a/drivers/infiniband/hw/hfi1/chip.c
> +++ b/drivers/infiniband/hw/hfi1/chip.c
> @@ -7320,7 +7320,7 @@ static u16 link_width_to_bits(struct hfi1_devdata *dd, u16 width)
> default:
> dd_dev_info(dd, "%s: invalid width %d, using 4\n",
> __func__, width);
> - /* fall through */
> + fallthrough;
> case 4: return OPA_LINK_WIDTH_4X;
"case ..:" after "default:" ???
IMHO, it should be written in more standard way.
> }
> }
> @@ -7380,7 +7380,7 @@ static void get_link_widths(struct hfi1_devdata *dd, u16 *tx_width,
> dd_dev_err(dd,
> "%s: unexpected max rate %d, using 25Gb\n",
> __func__, (int)max_rate);
> - /* fall through */
> + fallthrough;
> case 1:
> dd->pport[0].link_speed_active = OPA_LINK_SPEED_25G;
> break;
> @@ -12882,7 +12882,7 @@ static u32 chip_to_opa_lstate(struct hfi1_devdata *dd, u32 chip_lstate)
> dd_dev_err(dd,
> "Unknown logical state 0x%x, reporting IB_PORT_DOWN\n",
> chip_lstate);
> - /* fall through */
> + fallthrough;
> case LSTATE_DOWN:
> return IB_PORT_DOWN;
> case LSTATE_INIT:
> @@ -12901,7 +12901,7 @@ u32 chip_to_opa_pstate(struct hfi1_devdata *dd, u32 chip_pstate)
> default:
> dd_dev_err(dd, "Unexpected chip physical state of 0x%x\n",
> chip_pstate);
> - /* fall through */
> + fallthrough;
> case PLS_DISABLED:
> return IB_PORTPHYSSTATE_DISABLED;
> case PLS_OFFLINE:
same comment.
> diff --git a/drivers/infiniband/hw/hfi1/firmware.c b/drivers/infiniband/hw/hfi1/firmware.c
> index 2b57ba70ddd6..0e83d4b61e46 100644
> --- a/drivers/infiniband/hw/hfi1/firmware.c
> +++ b/drivers/infiniband/hw/hfi1/firmware.c
> @@ -1868,11 +1868,8 @@ int parse_platform_config(struct hfi1_devdata *dd)
> 2;
> break;
> case PLATFORM_CONFIG_RX_PRESET_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_TX_PRESET_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
> pcfgcache->config_tables[table_type].num_table =
> table_length_dwords;
> @@ -1890,15 +1887,10 @@ int parse_platform_config(struct hfi1_devdata *dd)
> /* metadata table */
> switch (table_type) {
> case PLATFORM_CONFIG_SYSTEM_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_PORT_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_RX_PRESET_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_TX_PRESET_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
> break;
> default:
> @@ -2027,15 +2019,10 @@ static int get_platform_fw_field_metadata(struct hfi1_devdata *dd, int table,
>
> switch (table) {
> case PLATFORM_CONFIG_SYSTEM_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_PORT_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_RX_PRESET_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_TX_PRESET_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
> if (field && field < platform_config_table_limits[table])
> src_ptr =
> @@ -2138,11 +2125,8 @@ int get_platform_config_field(struct hfi1_devdata *dd,
> pcfgcache->config_tables[table_type].table;
> break;
> case PLATFORM_CONFIG_RX_PRESET_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_TX_PRESET_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
> - /* fall through */
> case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
> src_ptr = pcfgcache->config_tables[table_type].table;
>
> diff --git a/drivers/infiniband/hw/hfi1/mad.c b/drivers/infiniband/hw/hfi1/mad.c
> index 7073f237a949..3222e3acb79c 100644
> --- a/drivers/infiniband/hw/hfi1/mad.c
> +++ b/drivers/infiniband/hw/hfi1/mad.c
> @@ -721,7 +721,7 @@ static int check_mkey(struct hfi1_ibport *ibp, struct ib_mad_hdr *mad,
> /* Bad mkey not a violation below level 2 */
> if (ibp->rvp.mkeyprot < 2)
> break;
> - /* fall through */
> + fallthrough;
> case IB_MGMT_METHOD_SET:
> case IB_MGMT_METHOD_TRAP_REPRESS:
> if (ibp->rvp.mkey_violations != 0xFFFF)
> @@ -1272,7 +1272,7 @@ static int set_port_states(struct hfi1_pportdata *ppd, struct opa_smp *smp,
> case IB_PORT_NOP:
> if (phys_state == IB_PORTPHYSSTATE_NOP)
> break;
> - /* FALLTHROUGH */
> + fallthrough;
> case IB_PORT_DOWN:
> if (phys_state == IB_PORTPHYSSTATE_NOP) {
> link_state = HLS_DN_DOWNDEF;
> @@ -2300,7 +2300,6 @@ static int __subn_set_opa_vl_arb(struct opa_smp *smp, u32 am, u8 *data,
> * can be changed from the default values
> */
> case OPA_VLARB_PREEMPT_ELEMENTS:
> - /* FALLTHROUGH */
> case OPA_VLARB_PREEMPT_MATRIX:
> smp->status |= IB_SMP_UNSUP_METH_ATTR;
> break;
> @@ -4170,7 +4169,7 @@ static int subn_get_opa_sma(__be16 attr_id, struct opa_smp *smp, u32 am,
> return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
> if (ibp->rvp.port_cap_flags & IB_PORT_SM)
> return IB_MAD_RESULT_SUCCESS;
> - /* FALLTHROUGH */
> + fallthrough;
> default:
> smp->status |= IB_SMP_UNSUP_METH_ATTR;
> ret = reply((struct ib_mad_hdr *)smp);
> @@ -4240,7 +4239,7 @@ static int subn_set_opa_sma(__be16 attr_id, struct opa_smp *smp, u32 am,
> return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
> if (ibp->rvp.port_cap_flags & IB_PORT_SM)
> return IB_MAD_RESULT_SUCCESS;
> - /* FALLTHROUGH */
> + fallthrough;
> default:
> smp->status |= IB_SMP_UNSUP_METH_ATTR;
> ret = reply((struct ib_mad_hdr *)smp);
> diff --git a/drivers/infiniband/hw/hfi1/pio.c b/drivers/infiniband/hw/hfi1/pio.c
> index 79126b2b14ab..ff864f6f0266 100644
> --- a/drivers/infiniband/hw/hfi1/pio.c
> +++ b/drivers/infiniband/hw/hfi1/pio.c
> @@ -86,7 +86,7 @@ void pio_send_control(struct hfi1_devdata *dd, int op)
> switch (op) {
> case PSC_GLOBAL_ENABLE:
> reg |= SEND_CTRL_SEND_ENABLE_SMASK;
> - /* Fall through */
> + fallthrough;
> case PSC_DATA_VL_ENABLE:
> mask = 0;
> for (i = 0; i < ARRAY_SIZE(dd->vld); i++)
> diff --git a/drivers/infiniband/hw/hfi1/pio_copy.c b/drivers/infiniband/hw/hfi1/pio_copy.c
> index 03024cec78dd..b12e4665c9ab 100644
> --- a/drivers/infiniband/hw/hfi1/pio_copy.c
> +++ b/drivers/infiniband/hw/hfi1/pio_copy.c
> @@ -191,22 +191,22 @@ static inline void jcopy(u8 *dest, const u8 *src, u32 n)
> switch (n) {
> case 7:
> *dest++ = *src++;
> - /* fall through */
> + fallthrough;
> case 6:
> *dest++ = *src++;
> - /* fall through */
> + fallthrough;
> case 5:
> *dest++ = *src++;
> - /* fall through */
> + fallthrough;
> case 4:
> *dest++ = *src++;
> - /* fall through */
> + fallthrough;
> case 3:
> *dest++ = *src++;
> - /* fall through */
> + fallthrough;
> case 2:
> *dest++ = *src++;
> - /* fall through */
> + fallthrough;
> case 1:
> *dest++ = *src++;
> /* fall through */
This is missed and it seems that one memcpy will do the same.
> diff --git a/drivers/infiniband/hw/hfi1/platform.c b/drivers/infiniband/hw/hfi1/platform.c
> index 36593f2efe26..4642d6ceb890 100644
> --- a/drivers/infiniband/hw/hfi1/platform.c
> +++ b/drivers/infiniband/hw/hfi1/platform.c
> @@ -668,8 +668,8 @@ static u8 aoc_low_power_setting(struct hfi1_pportdata *ppd)
>
> /* active optical cables only */
> switch ((cache[QSFP_MOD_TECH_OFFS] & 0xF0) >> 4) {
> - case 0x0 ... 0x9: /* fallthrough */
> - case 0xC: /* fallthrough */
> + case 0x0 ... 0x9: fallthrough;
> + case 0xC: fallthrough;
fallthrough is not needed.
> case 0xE:
> /* active AOC */
> power_class = get_qsfp_power_class(cache[QSFP_MOD_PWR_OFFS]);
> @@ -899,8 +899,8 @@ static int tune_qsfp(struct hfi1_pportdata *ppd,
>
> *ptr_tuning_method = OPA_PASSIVE_TUNING;
> break;
> - case 0x0 ... 0x9: /* fallthrough */
> - case 0xC: /* fallthrough */
> + case 0x0 ... 0x9: fallthrough;
> + case 0xC: fallthrough;
same
Thanks
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