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Date: Mon, 19 Oct 2015 17:04:32 +0000
From: "Moore, Robert" <robert.moore@...el.com>
To: LABBE Corentin <montjoie.mailing@...il.com>
CC: LABBE Corentin <clabbe.montjoie@...il.com>,
"Zheng, Lv" <lv.zheng@...el.com>,
"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
"lenb@...nel.org" <lenb@...nel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"devel@...ica.org" <devel@...ica.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] acpi: set return value to const char for some functions
Actually, I thought I got most of the changes.
Again, ACPICA code is in a different format than the Linux version of the code, so your patch cannot be directly applied.
Bob
> -----Original Message-----
> From: LABBE Corentin [mailto:montjoie.mailing@...il.com]
> Sent: Monday, October 19, 2015 5:03 AM
> To: Moore, Robert
> Cc: LABBE Corentin; Zheng, Lv; Wysocki, Rafael J; lenb@...nel.org; linux-
> acpi@...r.kernel.org; devel@...ica.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] acpi: set return value to const char for some
> functions
>
> On Wed, Oct 14, 2015 at 08:53:19PM +0000, Moore, Robert wrote:
> > In ACPICA, we tend to be very careful concerning the "const" keyword in
> order to avoid a phenomenon known as "const pollution".
> >
> > That is not to say that we won't use const in some limited cases.
> >
> > Bob
> >
>
> Hello
>
> The problem is that all function in this patch return a pointer to string
> literal without giving that information.
> I am sad to see that you seems to agree with that but, for resuming your
> conversation with Joe Perches, you reject this patch just because you
> worry that perhaps in the future it will make you more works do deal with
> it.
>
> Does you will accept the subset of this patch for adding const to "static
> char xxx[] = {}" ?
>
> Regards
>
> >
> > > -----Original Message-----
> > > From: LABBE Corentin [mailto:clabbe.montjoie@...il.com]
> > > Sent: Wednesday, October 14, 2015 12:07 PM
> > > To: Moore, Robert; Zheng, Lv; Wysocki, Rafael J; lenb@...nel.org
> > > Cc: linux-acpi@...r.kernel.org; devel@...ica.org; linux-
> > > kernel@...r.kernel.org; LABBE Corentin
> > > Subject: [PATCH] acpi: set return value to const char for some
> > > functions
> > >
> > > This patch set some array of const char as const.
> > > In the same time, some function return pointer to thoses array
> > > without properly giving the information that the data is const.
> > > This patch set the return type of thoses functions as const char *
> > >
> > > Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
> > > ---
> > > drivers/acpi/acpica/acutils.h | 12 ++++++------
> > > drivers/acpi/acpica/utdecode.c | 24 ++++++++++++------------
> > > drivers/acpi/acpica/uthex.c | 4 ++--
> > > drivers/acpi/tables.c | 6 ++++--
> > > 4 files changed, 24 insertions(+), 22 deletions(-)
> > >
> > > diff --git a/drivers/acpi/acpica/acutils.h
> > > b/drivers/acpi/acpica/acutils.h index fb2aa50..e5d9d4f 100644
> > > --- a/drivers/acpi/acpica/acutils.h
> > > +++ b/drivers/acpi/acpica/acutils.h
> > > @@ -189,21 +189,21 @@ char *acpi_ut_get_mutex_name(u32 mutex_id);
> > > const char *acpi_ut_get_notify_name(u32 notify_value,
> > > acpi_object_type type); #endif
> > >
> > > -char *acpi_ut_get_type_name(acpi_object_type type);
> > > +const char *acpi_ut_get_type_name(acpi_object_type type);
> > >
> > > char *acpi_ut_get_node_name(void *object);
> > >
> > > -char *acpi_ut_get_descriptor_name(void *object);
> > > +const char *acpi_ut_get_descriptor_name(void *object);
> > >
> > > const char *acpi_ut_get_reference_name(union acpi_operand_object
> > > *object);
> > >
> > > -char *acpi_ut_get_object_type_name(union acpi_operand_object
> > > *obj_desc);
> > > +const char *acpi_ut_get_object_type_name(union acpi_operand_object
> > > +*obj_desc);
> > >
> > > -char *acpi_ut_get_region_name(u8 space_id);
> > > +const char *acpi_ut_get_region_name(u8 space_id);
> > >
> > > -char *acpi_ut_get_event_name(u32 event_id);
> > > +const char *acpi_ut_get_event_name(u32 event_id);
> > >
> > > -char acpi_ut_hex_to_ascii_char(u64 integer, u32 position);
> > > +const char acpi_ut_hex_to_ascii_char(u64 integer, u32 position);
> > >
> > > u8 acpi_ut_ascii_char_to_hex(int hex_char);
> > >
> > > diff --git a/drivers/acpi/acpica/utdecode.c
> > > b/drivers/acpi/acpica/utdecode.c index 988e23b..e08cdb1 100644
> > > --- a/drivers/acpi/acpica/utdecode.c
> > > +++ b/drivers/acpi/acpica/utdecode.c
> > > @@ -114,7 +114,7 @@ const char
> > > *acpi_gbl_region_types[ACPI_NUM_PREDEFINED_REGIONS] = {
> > > "PCC" /* 0x0A */
> > > };
> > >
> > > -char *acpi_ut_get_region_name(u8 space_id)
> > > +const char *acpi_ut_get_region_name(u8 space_id)
> > > {
> > >
> > > if (space_id >= ACPI_USER_REGION_BEGIN) { @@ -127,7 +127,7 @@ char
> > > *acpi_ut_get_region_name(u8 space_id)
> > > return ("InvalidSpaceId");
> > > }
> > >
> > > - return (ACPI_CAST_PTR(char, acpi_gbl_region_types[space_id]));
> > > + return (ACPI_CAST_PTR(const char,
> > > +acpi_gbl_region_types[space_id]));
> > > }
> > >
> > >
> > > /*******************************************************************
> > > ******
> > > ******
> > > @@ -152,14 +152,14 @@ static const char
> > > *acpi_gbl_event_types[ACPI_NUM_FIXED_EVENTS] = {
> > > "RealTimeClock",
> > > };
> > >
> > > -char *acpi_ut_get_event_name(u32 event_id)
> > > +const char *acpi_ut_get_event_name(u32 event_id)
> > > {
> > >
> > > if (event_id > ACPI_EVENT_MAX) {
> > > return ("InvalidEventID");
> > > }
> > >
> > > - return (ACPI_CAST_PTR(char, acpi_gbl_event_types[event_id]));
> > > + return (ACPI_CAST_PTR(const char,
> > > +acpi_gbl_event_types[event_id]));
> > > }
> > >
> > >
> > > /*******************************************************************
> > > ******
> > > ******
> > > @@ -220,17 +220,17 @@ static const char *acpi_gbl_ns_type_names[] = {
> > > /* 30 */ "Invalid"
> > > };
> > >
> > > -char *acpi_ut_get_type_name(acpi_object_type type)
> > > +const char *acpi_ut_get_type_name(acpi_object_type type)
> > > {
> > >
> > > if (type > ACPI_TYPE_INVALID) {
> > > - return (ACPI_CAST_PTR(char, acpi_gbl_bad_type));
> > > + return (ACPI_CAST_PTR(const char, acpi_gbl_bad_type));
> > > }
> > >
> > > - return (ACPI_CAST_PTR(char, acpi_gbl_ns_type_names[type]));
> > > + return (ACPI_CAST_PTR(const char, acpi_gbl_ns_type_names[type]));
> > > }
> > >
> > > -char *acpi_ut_get_object_type_name(union acpi_operand_object
> > > *obj_desc)
> > > +const char *acpi_ut_get_object_type_name(union acpi_operand_object
> > > +*obj_desc)
> > > {
> > >
> > > if (!obj_desc) {
> > > @@ -318,7 +318,7 @@ static const char *acpi_gbl_desc_type_names[] = {
> > > /* 15 */ "Node"
> > > };
> > >
> > > -char *acpi_ut_get_descriptor_name(void *object)
> > > +const char *acpi_ut_get_descriptor_name(void *object)
> > > {
> > >
> > > if (!object) {
> > > @@ -329,7 +329,7 @@ char *acpi_ut_get_descriptor_name(void *object)
> > > return ("Not a Descriptor");
> > > }
> > >
> > > - return (ACPI_CAST_PTR(char,
> > > + return (ACPI_CAST_PTR(const char,
> > > acpi_gbl_desc_type_names[ACPI_GET_DESCRIPTOR_TYPE
> > > (object)]));
> > >
> > > @@ -400,7 +400,7 @@ const char *acpi_ut_get_reference_name(union
> > > acpi_operand_object *object)
> > >
> > > /* Names for internal mutex objects, used for debug output */
> > >
> > > -static char *acpi_gbl_mutex_names[ACPI_NUM_MUTEX] = {
> > > +static const char *acpi_gbl_mutex_names[ACPI_NUM_MUTEX] = {
> > > "ACPI_MTX_Interpreter",
> > > "ACPI_MTX_Namespace",
> > > "ACPI_MTX_Tables",
> > > @@ -411,7 +411,7 @@ static char *acpi_gbl_mutex_names[ACPI_NUM_MUTEX]
> = {
> > > "ACPI_MTX_CommandReady"
> > > };
> > >
> > > -char *acpi_ut_get_mutex_name(u32 mutex_id)
> > > +const char *acpi_ut_get_mutex_name(u32 mutex_id)
> > > {
> > >
> > > if (mutex_id > ACPI_MAX_MUTEX) {
> > > diff --git a/drivers/acpi/acpica/uthex.c
> > > b/drivers/acpi/acpica/uthex.c index fda8b3d..9239711 100644
> > > --- a/drivers/acpi/acpica/uthex.c
> > > +++ b/drivers/acpi/acpica/uthex.c
> > > @@ -48,7 +48,7 @@
> > > ACPI_MODULE_NAME("uthex")
> > >
> > > /* Hex to ASCII conversion table */ -static char
> > > acpi_gbl_hex_to_ascii[] = {
> > > +static const char acpi_gbl_hex_to_ascii[] = {
> > > '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C',
> > > 'D',
> > > 'E', 'F'
> > > };
> > > @@ -67,7 +67,7 @@ static char acpi_gbl_hex_to_ascii[] = {
> > > *
> > >
> > > ********************************************************************
> > > ******
> > > ****/
> > >
> > > -char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
> > > +const char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
> > > {
> > >
> > > return (acpi_gbl_hex_to_ascii[(integer >> position) & 0xF]); diff
> > > -- git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index
> > > 17a6fa0..7c8a037
> > > 100644
> > > --- a/drivers/acpi/tables.c
> > > +++ b/drivers/acpi/tables.c
> > > @@ -35,8 +35,10 @@
> > >
> > > #define ACPI_MAX_TABLES 128
> > >
> > > -static char *mps_inti_flags_polarity[] = { "dfl", "high", "res",
> > > "low" }; -static char *mps_inti_flags_trigger[] = { "dfl", "edge",
> "res", "level"
> > > };
> > > +static const char * const mps_inti_flags_polarity[] = {
> > > + "dfl", "high", "res", "low" };
> > > +static const char * const mps_inti_flags_trigger[] = {
> > > + "dfl", "edge", "res", "level" };
> > >
> > > static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES]
> > > __initdata;
> > >
> > > --
> > > 2.4.9
> >
> > --
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