2021-02-04 21:56:23

by Rikard Falkeborn

Subject: [PATCH] tpm/ppi: Constify static struct attribute_group

The only usage of ppi_attr_grp is to put its address in an array of
pointers to const struct attribute_group. Make it const to allow the
compiler to put it in read-only memory.

Signed-off-by: Rikard Falkeborn <[email protected]>
---
drivers/char/tpm/tpm_ppi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c
index b2dab941cb7f..40018a73b3cb 100644
--- a/drivers/char/tpm/tpm_ppi.c
+++ b/drivers/char/tpm/tpm_ppi.c
@@ -358,7 +358,7 @@ static struct attribute *ppi_attrs[] = {
&dev_attr_tcg_operations.attr,
&dev_attr_vs_operations.attr, NULL,
};
-static struct attribute_group ppi_attr_grp = {
+static const struct attribute_group ppi_attr_grp = {
.name = "ppi",
.attrs = ppi_attrs
};
--
2.30.0

2021-02-05 02:08:32

by Jarkko Sakkinen

Subject: Re: [PATCH] tpm/ppi: Constify static struct attribute_group

On Thu, Feb 04, 2021 at 10:54:27PM +0100, Rikard Falkeborn wrote:
> The only usage of ppi_attr_grp is to put its address in an array of
> pointers to const struct attribute_group. Make it const to allow the
> compiler to put it in read-only memory.
>
> Signed-off-by: Rikard Falkeborn <[email protected]>

Thanks.

Reviewed-by: Jarkko Sakkinen <[email protected]>

/Jarkko

> ---
> drivers/char/tpm/tpm_ppi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c
> index b2dab941cb7f..40018a73b3cb 100644
> --- a/drivers/char/tpm/tpm_ppi.c
> +++ b/drivers/char/tpm/tpm_ppi.c
> @@ -358,7 +358,7 @@ static struct attribute *ppi_attrs[] = {
> &dev_attr_tcg_operations.attr,
> &dev_attr_vs_operations.attr, NULL,
> };
> -static struct attribute_group ppi_attr_grp = {
> +static const struct attribute_group ppi_attr_grp = {
> .name = "ppi",
> .attrs = ppi_attrs
> };
> --
> 2.30.0
>
>

2021-02-26 22:00:03

by Rikard Falkeborn

Subject: Re: [PATCH] tpm/ppi: Constify static struct attribute_group

On Fri, Feb 05, 2021 at 04:04:18AM +0200, Jarkko Sakkinen wrote:
> On Thu, Feb 04, 2021 at 10:54:27PM +0100, Rikard Falkeborn wrote:
> > The only usage of ppi_attr_grp is to put its address in an array of
> > pointers to const struct attribute_group. Make it const to allow the
> > compiler to put it in read-only memory.
> >
> > Signed-off-by: Rikard Falkeborn <[email protected]>
>
> Thanks.
>
> Reviewed-by: Jarkko Sakkinen <[email protected]>
>
> /Jarkko
>

Hi Jarkko,
I saw this was merged as commit
90cba8d20f8b09d62a25f9864cb8e67722d76c3a, but in the commit, there was an
additional change where a call to dump_stack() was added in
drivers/char/tpm/tpm-chip.c, was this intentional?

/Rikard

2021-03-03 01:41:26

by Jarkko Sakkinen

Subject: Re: [PATCH] tpm/ppi: Constify static struct attribute_group

On Fri, Feb 26, 2021 at 10:56:12PM +0100, Rikard Falkeborn wrote:
> On Fri, Feb 05, 2021 at 04:04:18AM +0200, Jarkko Sakkinen wrote:
> > On Thu, Feb 04, 2021 at 10:54:27PM +0100, Rikard Falkeborn wrote:
> > > The only usage of ppi_attr_grp is to put its address in an array of
> > > pointers to const struct attribute_group. Make it const to allow the
> > > compiler to put it in read-only memory.
> > >
> > > Signed-off-by: Rikard Falkeborn <[email protected]>
> >
> > Thanks.
> >
> > Reviewed-by: Jarkko Sakkinen <[email protected]>
> >
> > /Jarkko
> >
>
> Hi Jarkko,
> I saw this was merged as commit
> 90cba8d20f8b09d62a25f9864cb8e67722d76c3a, but in the commit, there was an
> additional change where a call to dump_stack() was added in
> drivers/char/tpm/tpm-chip.c, was this intentional?

No, thanks for reporting. I sent a fixup. Can you ack it?

/Jarkko