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Date: Tue, 26 May 2020 19:25:27 +0200
From: Oscar Carter <oscar.carter@....com>
To: Marc Zyngier <maz@...nel.org>
Cc: Oscar Carter <oscar.carter@....com>, Kees Cook <keescook@...omium.org>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers/irqchip: Remove function callback casts
On Mon, May 25, 2020 at 11:55:33AM +0100, Marc Zyngier wrote:
> On Sun, 24 May 2020 17:22:20 +0100,
> Oscar Carter <oscar.carter@....com> wrote:
> >
> > include/linux/acpi.h | 11 +++++++++++
>
> You now need to Cc the ACPI maintainers.
Sorry for forgetting.
> > include/linux/irqchip.h | 5 +++--
> > 2 files changed, 14 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> > index d661cd0ee64d..fed49b276a90 100644
> > --- a/include/linux/acpi.h
> > +++ b/include/linux/acpi.h
> > @@ -1154,6 +1154,17 @@ struct acpi_probe_entry {
> > .driver_data = data, \
> > }
> >
> > +#define ACPI_DECLARE_SUBTABLE_PROBE_ENTRY(table, name, table_id, \
> > + subtable, valid, data, fn) \
> > + static const struct acpi_probe_entry __acpi_probe_##name \
> > + __used __section(__##table##_acpi_probe_table) = { \
> > + .id = table_id, \
> > + .type = subtable, \
> > + .subtable_valid = valid, \
> > + .probe_subtbl = (acpi_tbl_entry_handler)fn, \
>
> It strikes me that under the guise of removing function casts, you are
> actually adding one! And this cast is actually hiding all sorts of
> sins (remove it, and see things exploding).
Yes, if I remove it I see things exploiding. I'm very sorry.
> I've fixed it with the patch below (ACPI is such a mess of data
> structure case...).
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index d7006ef18a0d..3870e9d4d3a8 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -2117,7 +2117,7 @@ static void __init gic_acpi_setup_kvm_info(void)
> }
>
> static int __init
> -gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end)
> +gic_acpi_init(union acpi_subtable_headers *header, const unsigned long end)
> {
> struct acpi_madt_generic_distributor *dist;
> struct fwnode_handle *domain_handle;
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index 30ab623343d3..fc431857ce90 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -1593,7 +1593,7 @@ static void __init gic_acpi_setup_kvm_info(void)
> gic_set_kvm_info(&gic_v2_kvm_info);
> }
>
> -static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
> +static int __init gic_v2_acpi_init(union acpi_subtable_headers *header,
> const unsigned long end)
> {
> struct acpi_madt_generic_distributor *dist;
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index fed49b276a90..4f4ddbfce3d3 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -1150,7 +1150,7 @@ struct acpi_probe_entry {
> .id = table_id, \
> .type = subtable, \
> .subtable_valid = valid, \
> - .probe_table = (acpi_tbl_table_handler)fn, \
> + .probe_table = fn, \
> .driver_data = data, \
> }
>
> @@ -1161,7 +1161,7 @@ struct acpi_probe_entry {
> .id = table_id, \
> .type = subtable, \
> .subtable_valid = valid, \
> - .probe_subtbl = (acpi_tbl_entry_handler)fn, \
> + .probe_subtbl = fn, \
> .driver_data = data, \
> }
>
Thanks for your help with this patch. I will do all the necessary changes
and I will resend a new version.
Do you mind if I add these two lines:
Co-developed-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Marc Zyngier <maz@...nel.org>
in the next version to give you credit?
> Thanks,
>
> M.
>
> --
> Without deviation from the norm, progress is not possible.
Thanks,
Oscar
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