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ACPICA: fix -Wfallthrough

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ACPICA commit 4b9135f5774caa796ddf826448811e8e7f08ef2f

GCC 7.1 gained -Wimplicit-fallthrough to warn on implicit fallthrough,
as well as __attribute__((__fallthrough__)) and comments to explicitly
denote that cases of fallthrough were intentional. Clang also supports
this warning and statement attribute, but not the comment form.

Robert Moore provides additional context about the lint comments being
removed. They were for "an old version of PC-Lint, which we don't use
anymore." Drop those.

This will help us enable -Wimplicit-fallthrough throughout the Linux
kernel.

Suggested-by: Robert Moore <robert.moore@intel.com>
Reported-by: Jon Hunter <jonathanh@nvidia.com>

Link: https://github.com/acpica/acpica/commit/4b9135f5
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Kaneda <erik.kaneda@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Nick Desaulniers 2021-01-21 16:23:51 -08:00 committed by Rafael J. Wysocki
parent 25d866c46c
commit c1a7c2ce7c
11 changed files with 32 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/acpi/acpica/dscontrol.c
View File

@ -62,7 +62,7 @@ acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
}
}
/*lint -fallthrough */
ACPI_FALLTHROUGH;
case AML_IF_OP:
/*

3
drivers/acpi/acpica/dswexec.c
View File

@ -598,8 +598,7 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
break;
}
/* Fall through */
/*lint -fallthrough */
ACPI_FALLTHROUGH;
case AML_INT_EVAL_SUBTREE_OP:

2
drivers/acpi/acpica/dswload.c
View File

@ -224,7 +224,7 @@ acpi_ds_load1_begin_op(struct acpi_walk_state *walk_state,
break;
}
/*lint -fallthrough */
ACPI_FALLTHROUGH;
default:

2
drivers/acpi/acpica/dswload2.c
View File

@ -214,7 +214,7 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
break;
}
/*lint -fallthrough */
ACPI_FALLTHROUGH;
default:

2
drivers/acpi/acpica/exfldio.c
View File

@ -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 */
ACPI_FALLTHROUGH;
case ACPI_TYPE_LOCAL_REGION_FIELD:
/*

4
drivers/acpi/acpica/exresop.c
View File

@ -198,7 +198,7 @@ acpi_ex_resolve_operands(u16 opcode,
target_op = AML_DEBUG_OP;
/*lint -fallthrough */
ACPI_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 */
ACPI_FALLTHROUGH;
case ARGI_REFERENCE: /* References: */
case ARGI_INTEGER_REF:

4
drivers/acpi/acpica/exstore.c
View File

@ -96,7 +96,7 @@ acpi_ex_store(union acpi_operand_object *source_desc,
return_ACPI_STATUS(AE_OK);
}
/*lint -fallthrough */
ACPI_FALLTHROUGH;
default:
@ -422,7 +422,7 @@ acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
break;
}
/* Fallthrough */
ACPI_FALLTHROUGH;
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_EVENT:

2
drivers/acpi/acpica/hwgpe.c
View File

@ -167,7 +167,7 @@ acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u32 action)
return (AE_BAD_PARAMETER);
}
/*lint -fallthrough */
ACPI_FALLTHROUGH;
case ACPI_GPE_ENABLE:

2
drivers/acpi/acpica/utdelete.c
View File

@ -112,7 +112,7 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
gpe_block);
}
/*lint -fallthrough */
ACPI_FALLTHROUGH;
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_THERMAL:

6
include/acpi/actypes.h
View File

@ -1286,4 +1286,10 @@ typedef enum {
#define ACPI_OPT_END -1
/* Definitions for explicit fallthrough */
#ifndef ACPI_FALLTHROUGH
#define ACPI_FALLTHROUGH do {} while(0)
#endif
#endif /* __ACTYPES_H__ */

15
include/acpi/platform/acgcc.h
View File

@ -54,4 +54,19 @@ typedef __builtin_va_list va_list;
#define ACPI_USE_NATIVE_MATH64
/* GCC did not support __has_attribute until 5.1. */
#ifndef __has_attribute
#define __has_attribute(x) 0
#endif
/*
* Explictly mark intentional explicit fallthrough to silence
* -Wimplicit-fallthrough in GCC 7.1+.
*/
#if __has_attribute(__fallthrough__)
#define ACPI_FALLTHROUGH __attribute__((__fallthrough__))
#endif
#endif /* __ACGCC_H__ */