On Tue, Jul 04, 2023 at 08:05:17PM +0800, LeoLiu-oc wrote:
> From: leoliu-oc <leoliu-oc@xxxxxxxxxxx>
>
> Each dev with AER capability needs to call the apei_hest_parse function to
> match and extract register values from HEST PCIe AER structures.
> Therefore, remove static from apei_hest_parse() so that it can be called
> in another file.
Can you reword the subject line and commit log in the positive?
"Removing static" is a negative thing and it's semantically a bit too
low level -- it's clearly what the *code* does, but we can see that
from the patch, and what we want to know here is *why* it's important.
What this really does is expose apei_hest_parse() for use by other
subsystems.
Browsing the drivers/acpi commit log history, I see that Rafael adds
"()" after function names, so please do the same here (you did do that
once above, but not in the first line).
> Signed-off-by: leoliu-oc <leoliu-oc@xxxxxxxxxxx>
> ---
> drivers/acpi/apei/hest.c | 2 +-
> include/acpi/apei.h | 5 +++++
> 2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
> index fb839a5c480ee..fd40c035c9b2e 100644
> --- a/drivers/acpi/apei/hest.c
> +++ b/drivers/acpi/apei/hest.c
> @@ -132,7 +132,7 @@ static bool hest_match_pci(struct acpi_hest_header *hest_hdr,
> return false;
> }
>
> -static int apei_hest_parse(apei_hest_func_t func, void *data)
> +int apei_hest_parse(apei_hest_func_t func, void *data)
If this is going to exported to the PCI subsystem, I think it needs
some kernel-doc. For example, it's important to know that it stops
parsing the HEST if func returns anything non-zero. This is how
pci_acpi_program_hest_aer_params() knows that it got good data that
matches the device it wants.
Given the fact that apei_hest_parse_aer() fills in the struct
acpi_hest_parse_aer_info with pointers into the HEST table data, it's
also important to know that this HEST table data is persistent.
> {
> struct acpi_hest_header *hest_hdr;
> int i, rc, len;
> diff --git a/include/acpi/apei.h b/include/acpi/apei.h
> index 8a0b2b9edbafe..f975e4fe78fcb 100644
> --- a/include/acpi/apei.h
> +++ b/include/acpi/apei.h
> @@ -37,9 +37,14 @@ typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data);
>
> #ifdef CONFIG_ACPI_APEI
> void __init acpi_hest_init(void);
> +int apei_hest_parse(apei_hest_func_t func, void *data);
> int apei_hest_parse_aer(struct acpi_hest_header *hest_hdr, void *data);
> #else
> static inline void acpi_hest_init(void) { }
> +static inline int apei_hest_parse(apei_hest_func_t func, void *data)
> +{
> + return -EINVAL;
> +}
> static inline int apei_hest_parse_aer(struct acpi_hest_header *hest_hdr, void *data)
> {
> return -EINVAL;
> --
> 2.34.1
>
