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Date: Mon, 1 Jul 2024 20:12:08 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Hans de Goede <hdegoede@...hat.com>, Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
Andy Shevchenko <andy@...nel.org>, Mika Westerberg <mika.westerberg@...ux.intel.com>,
linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
linux-acpi@...r.kernel.org
Subject: Re: [PATCH] ACPI: PMIC: Constify struct pmic_table
On Sat, Jun 29, 2024 at 12:06 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Hi,
>
> On 6/29/24 8:58 AM, Christophe JAILLET wrote:
> > 'struct pmic_table' is not modified in these drivers.
> >
> > Constifying this structure moves some data to a read-only section, so
> > increase overall security.
> >
> > On a x86_64, with allmodconfig, as an example:
> > Before:
> > ======
> > text data bss dec hex filename
> > 3811 786 0 4597 11f5 drivers/acpi/pmic/intel_pmic_xpower.o
> >
> > text data bss dec hex filename
> > 4147 450 0 4597 11f5 drivers/acpi/pmic/intel_pmic_xpower.o
> >
> > Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> > ---
> > Compile tested-only
>
> Thanks, patch looks good to me:
>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Applied as 6.11 material, thanks!
> > ---
> > drivers/acpi/pmic/intel_pmic.c | 2 +-
> > drivers/acpi/pmic/intel_pmic.h | 4 ++--
> > drivers/acpi/pmic/intel_pmic_bxtwc.c | 4 ++--
> > drivers/acpi/pmic/intel_pmic_bytcrc.c | 4 ++--
> > drivers/acpi/pmic/intel_pmic_chtdc_ti.c | 4 ++--
> > drivers/acpi/pmic/intel_pmic_chtwc.c | 2 +-
> > drivers/acpi/pmic/intel_pmic_xpower.c | 4 ++--
> > 7 files changed, 12 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/acpi/pmic/intel_pmic.c b/drivers/acpi/pmic/intel_pmic.c
> > index f20dbda1a831..134e9ca8eaa2 100644
> > --- a/drivers/acpi/pmic/intel_pmic.c
> > +++ b/drivers/acpi/pmic/intel_pmic.c
> > @@ -31,7 +31,7 @@ struct intel_pmic_opregion {
> >
> > static struct intel_pmic_opregion *intel_pmic_opregion;
> >
> > -static int pmic_get_reg_bit(int address, struct pmic_table *table,
> > +static int pmic_get_reg_bit(int address, const struct pmic_table *table,
> > int count, int *reg, int *bit)
> > {
> > int i;
> > diff --git a/drivers/acpi/pmic/intel_pmic.h b/drivers/acpi/pmic/intel_pmic.h
> > index d956b03a6ca0..006f0780ffab 100644
> > --- a/drivers/acpi/pmic/intel_pmic.h
> > +++ b/drivers/acpi/pmic/intel_pmic.h
> > @@ -21,9 +21,9 @@ struct intel_pmic_opregion_data {
> > u32 reg_address, u32 value, u32 mask);
> > int (*lpat_raw_to_temp)(struct acpi_lpat_conversion_table *lpat_table,
> > int raw);
> > - struct pmic_table *power_table;
> > + const struct pmic_table *power_table;
> > int power_table_count;
> > - struct pmic_table *thermal_table;
> > + const struct pmic_table *thermal_table;
> > int thermal_table_count;
> > /* For generic exec_mipi_pmic_seq_element handling */
> > int pmic_i2c_address;
> > diff --git a/drivers/acpi/pmic/intel_pmic_bxtwc.c b/drivers/acpi/pmic/intel_pmic_bxtwc.c
> > index e247615189fa..c332afbf82bd 100644
> > --- a/drivers/acpi/pmic/intel_pmic_bxtwc.c
> > +++ b/drivers/acpi/pmic/intel_pmic_bxtwc.c
> > @@ -24,7 +24,7 @@
> > #define VSWITCH1_OUTPUT BIT(4)
> > #define VUSBPHY_CHARGE BIT(1)
> >
> > -static struct pmic_table power_table[] = {
> > +static const struct pmic_table power_table[] = {
> > {
> > .address = 0x0,
> > .reg = 0x63,
> > @@ -177,7 +177,7 @@ static struct pmic_table power_table[] = {
> > } /* MOFF -> MODEMCTRL Bit 0 */
> > };
> >
> > -static struct pmic_table thermal_table[] = {
> > +static const struct pmic_table thermal_table[] = {
> > {
> > .address = 0x00,
> > .reg = 0x4F39
> > diff --git a/drivers/acpi/pmic/intel_pmic_bytcrc.c b/drivers/acpi/pmic/intel_pmic_bytcrc.c
> > index 2b09f8da5400..b4c21a75294a 100644
> > --- a/drivers/acpi/pmic/intel_pmic_bytcrc.c
> > +++ b/drivers/acpi/pmic/intel_pmic_bytcrc.c
> > @@ -16,7 +16,7 @@
> >
> > #define PMIC_A0LOCK_REG 0xc5
> >
> > -static struct pmic_table power_table[] = {
> > +static const struct pmic_table power_table[] = {
> > /* {
> > .address = 0x00,
> > .reg = ??,
> > @@ -134,7 +134,7 @@ static struct pmic_table power_table[] = {
> > }, /* V105 -> V1P05S, L2 SRAM */
> > };
> >
> > -static struct pmic_table thermal_table[] = {
> > +static const struct pmic_table thermal_table[] = {
> > {
> > .address = 0x00,
> > .reg = 0x75
> > diff --git a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
> > index 79f9df552524..ecb36fbc1e7f 100644
> > --- a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
> > +++ b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
> > @@ -23,7 +23,7 @@
> > #define CHTDC_TI_BPTHERM 0x58
> > #define CHTDC_TI_GPADC 0x5a
> >
> > -static struct pmic_table chtdc_ti_power_table[] = {
> > +static const struct pmic_table chtdc_ti_power_table[] = {
> > { .address = 0x00, .reg = 0x41 }, /* LDO1 */
> > { .address = 0x04, .reg = 0x42 }, /* LDO2 */
> > { .address = 0x08, .reg = 0x43 }, /* LDO3 */
> > @@ -39,7 +39,7 @@ static struct pmic_table chtdc_ti_power_table[] = {
> > { .address = 0x30, .reg = 0x4e }, /* LD14 */
> > };
> >
> > -static struct pmic_table chtdc_ti_thermal_table[] = {
> > +static const struct pmic_table chtdc_ti_thermal_table[] = {
> > {
> > .address = 0x00,
> > .reg = CHTDC_TI_GPADC
> > diff --git a/drivers/acpi/pmic/intel_pmic_chtwc.c b/drivers/acpi/pmic/intel_pmic_chtwc.c
> > index 25aa3e33b09a..81caede51ca2 100644
> > --- a/drivers/acpi/pmic/intel_pmic_chtwc.c
> > +++ b/drivers/acpi/pmic/intel_pmic_chtwc.c
> > @@ -70,7 +70,7 @@
> > * "regulator: whiskey_cove: implements Whiskey Cove pmic VRF support"
> > * https://github.com/intel-aero/meta-intel-aero/blob/master/recipes-kernel/linux/linux-yocto/0019-regulator-whiskey_cove-implements-WhiskeyCove-pmic-V.patch
> > */
> > -static struct pmic_table power_table[] = {
> > +static const struct pmic_table power_table[] = {
> > {
> > .address = 0x0,
> > .reg = CHT_WC_V1P8A_CTRL,
> > diff --git a/drivers/acpi/pmic/intel_pmic_xpower.c b/drivers/acpi/pmic/intel_pmic_xpower.c
> > index 43c5850b4bf3..49bda5e0c8aa 100644
> > --- a/drivers/acpi/pmic/intel_pmic_xpower.c
> > +++ b/drivers/acpi/pmic/intel_pmic_xpower.c
> > @@ -26,7 +26,7 @@
> > #define AXP288_ADC_TS_CURRENT_ON_ONDEMAND (2 << 0)
> > #define AXP288_ADC_TS_CURRENT_ON (3 << 0)
> >
> > -static struct pmic_table power_table[] = {
> > +static const struct pmic_table power_table[] = {
> > {
> > .address = 0x00,
> > .reg = 0x13,
> > @@ -129,7 +129,7 @@ static struct pmic_table power_table[] = {
> > };
> >
> > /* TMP0 - TMP5 are the same, all from GPADC */
> > -static struct pmic_table thermal_table[] = {
> > +static const struct pmic_table thermal_table[] = {
> > {
> > .address = 0x00,
> > .reg = XPOWER_GPADC_LOW
>
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