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Message-ID: <BYAPR11MB325602EDA2D2ACC2B28EAF4687670@BYAPR11MB3256.namprd11.prod.outlook.com>
Date: Wed, 8 Jul 2020 14:17:20 +0000
From: "Moore, Robert" <robert.moore@...el.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>
CC: "Kaneda, Erik" <erik.kaneda@...el.com>,
"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
Len Brown <lenb@...nel.org>,
"ACPI Devel Maling List" <linux-acpi@...r.kernel.org>,
"open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@...ica.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH][next] ACPICA: Use fallthrough pseudo-keyword
It looks like this attribute is not supported by msvc 2017 (and perhaps other compilers) -- it is apparently a GCC extension -- meaning that it cannot be used in the ACPICA compiler-independent code.
Bob
-----Original Message-----
From: Rafael J. Wysocki <rafael@...nel.org>
Sent: Wednesday, July 08, 2020 3:59 AM
To: Gustavo A. R. Silva <gustavoars@...nel.org>
Cc: Moore, Robert <robert.moore@...el.com>; Kaneda, Erik <erik.kaneda@...el.com>; Wysocki, Rafael J <rafael.j.wysocki@...el.com>; Len Brown <lenb@...nel.org>; ACPI Devel Maling List <linux-acpi@...r.kernel.org>; open list:ACPI COMPONENT ARCHITECTURE (ACPICA) <devel@...ica.org>; Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] ACPICA: Use fallthrough pseudo-keyword
On Tue, Jul 7, 2020 at 10:01 PM Gustavo A. R. Silva <gustavoars@...nel.org> 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?highlig
> ht=fallthrough#implicit-switch-case-fall-through
>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
I need to talk to Erik and Bob about this one.
> ---
> drivers/acpi/acpica/dscontrol.c | 2 +-
> drivers/acpi/acpica/dswexec.c | 3 +--
> drivers/acpi/acpica/dswload.c | 2 +-
> drivers/acpi/acpica/dswload2.c | 4 +---
> drivers/acpi/acpica/exfldio.c | 2 +-
> drivers/acpi/acpica/exresop.c | 4 ++--
> drivers/acpi/acpica/exstore.c | 4 ++--
> drivers/acpi/acpica/hwgpe.c | 3 +--
> drivers/acpi/acpica/utdelete.c | 3 +--
> drivers/acpi/acpica/utprint.c | 2 +-
> 10 files changed, 12 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/acpi/acpica/dscontrol.c
> b/drivers/acpi/acpica/dscontrol.c index 4b5b6e859f62..134d53380663
> 100644
> --- a/drivers/acpi/acpica/dscontrol.c
> +++ b/drivers/acpi/acpica/dscontrol.c
> @@ -62,7 +62,7 @@ acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
> }
> }
>
> - /*lint -fallthrough */
> + fallthrough;
>
> case AML_IF_OP:
> /*
> diff --git a/drivers/acpi/acpica/dswexec.c
> b/drivers/acpi/acpica/dswexec.c index 1d4f8c81028c..41f6cb61778a
> 100644
> --- a/drivers/acpi/acpica/dswexec.c
> +++ b/drivers/acpi/acpica/dswexec.c
> @@ -598,8 +598,7 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
> break;
> }
>
> - /* Fall through */
> - /*lint -fallthrough */
> + fallthrough;
>
> case AML_INT_EVAL_SUBTREE_OP:
>
> diff --git a/drivers/acpi/acpica/dswload.c
> b/drivers/acpi/acpica/dswload.c index 27069325b6de..1d8789869dda
> 100644
> --- a/drivers/acpi/acpica/dswload.c
> +++ b/drivers/acpi/acpica/dswload.c
> @@ -224,7 +224,7 @@ acpi_ds_load1_begin_op(struct acpi_walk_state *walk_state,
> break;
> }
>
> - /*lint -fallthrough */
> + fallthrough;
>
> default:
>
> diff --git a/drivers/acpi/acpica/dswload2.c
> b/drivers/acpi/acpica/dswload2.c index edadbe146506..de367e8e4cf4
> 100644
> --- a/drivers/acpi/acpica/dswload2.c
> +++ b/drivers/acpi/acpica/dswload2.c
> @@ -213,9 +213,7 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
> parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
> break;
> }
> -
> - /*lint -fallthrough */
> -
> + fallthrough;
> default:
>
> /* All other types are an error */ diff --git
> a/drivers/acpi/acpica/exfldio.c b/drivers/acpi/acpica/exfldio.c index
> ade35ff1c7ba..677ba3ab1482 100644
> --- a/drivers/acpi/acpica/exfldio.c
> +++ b/drivers/acpi/acpica/exfldio.c
> @@ -434,7 +434,7 @@ acpi_ex_field_datum_io(union acpi_operand_object *obj_desc,
> * region_field case and write the datum to the Operation Region
> */
>
> - /*lint -fallthrough */
> + fallthrough;
>
> case ACPI_TYPE_LOCAL_REGION_FIELD:
> /*
> diff --git a/drivers/acpi/acpica/exresop.c
> b/drivers/acpi/acpica/exresop.c index 4d1b22971d58..7c8676adcf43
> 100644
> --- a/drivers/acpi/acpica/exresop.c
> +++ b/drivers/acpi/acpica/exresop.c
> @@ -198,7 +198,7 @@ acpi_ex_resolve_operands(u16 opcode,
>
> target_op = AML_DEBUG_OP;
>
> - /*lint -fallthrough */
> + fallthrough;
>
> case ACPI_REFCLASS_ARG:
> case ACPI_REFCLASS_LOCAL:
> @@ -264,7 +264,7 @@ acpi_ex_resolve_operands(u16 opcode,
> * Else not a string - fall through to the normal Reference
> * case below
> */
> - /*lint -fallthrough */
> + fallthrough;
>
> case ARGI_REFERENCE: /* References: */
> case ARGI_INTEGER_REF:
> diff --git a/drivers/acpi/acpica/exstore.c
> b/drivers/acpi/acpica/exstore.c index 3adc0a29d890..fcf8dff56c5b
> 100644
> --- a/drivers/acpi/acpica/exstore.c
> +++ b/drivers/acpi/acpica/exstore.c
> @@ -96,7 +96,7 @@ acpi_ex_store(union acpi_operand_object *source_desc,
> return_ACPI_STATUS(AE_OK);
> }
>
> - /*lint -fallthrough */
> + fallthrough;
>
> default:
>
> @@ -422,7 +422,7 @@ acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
> break;
> }
>
> - /* Fallthrough */
> + fallthrough;
>
> case ACPI_TYPE_DEVICE:
> case ACPI_TYPE_EVENT:
> diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c
> index 49c46d4dd070..19d574f64c78 100644
> --- a/drivers/acpi/acpica/hwgpe.c
> +++ b/drivers/acpi/acpica/hwgpe.c
> @@ -95,8 +95,7 @@ acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u32 action)
> if (!(register_bit & gpe_register_info->enable_mask)) {
> return (AE_BAD_PARAMETER);
> }
> -
> - /*lint -fallthrough */
> + fallthrough;
>
> case ACPI_GPE_ENABLE:
>
> diff --git a/drivers/acpi/acpica/utdelete.c
> b/drivers/acpi/acpica/utdelete.c index c365faf4e6cd..6db09eb9d257
> 100644
> --- a/drivers/acpi/acpica/utdelete.c
> +++ b/drivers/acpi/acpica/utdelete.c
> @@ -111,8 +111,7 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
> (void)acpi_ev_delete_gpe_block(object->device.
> gpe_block);
> }
> -
> - /*lint -fallthrough */
> + fallthrough;
>
> case ACPI_TYPE_PROCESSOR:
> case ACPI_TYPE_THERMAL:
> diff --git a/drivers/acpi/acpica/utprint.c
> b/drivers/acpi/acpica/utprint.c index 681c11f4af4e..f7e43baf5ff2
> 100644
> --- a/drivers/acpi/acpica/utprint.c
> +++ b/drivers/acpi/acpica/utprint.c
> @@ -475,7 +475,7 @@ int vsnprintf(char *string, acpi_size size, const char *format, va_list args)
> case 'X':
>
> type |= ACPI_FORMAT_UPPER;
> - /* FALLTHROUGH */
> + fallthrough;
>
> case 'x':
>
>
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