Re: [Xen-devel] [PATCH v4 10/21] acpi/table: Introduce acpi_table_get_entry_madt to get specified entry

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.01.16 at 10:20, <zhaoshenglong@xxxxxxxxxx> wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> 
> This function could get the specified index entry of MADT table. This
> would be useful when it needs to get the contens of the entry.
> 
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Again - if this is the counterpart to a Linux side change, please name
that change. If it isn't, besides needing a better explanation of why
you need it whether neither Linux nor x86 Xen does is needed, and
a few code issues would need to be addressed too: Pointer type
function parameters should be constified as much as possible, use of
plain int should be avoided unless you truly need a signed type, and
...

> +struct acpi_subtable_header * __init
> +acpi_table_get_entry_madt(enum acpi_madt_type id, unsigned int entry_index)
> +{
> +     struct acpi_table_header *table_header = NULL;
> +
> +     acpi_get_table(ACPI_SIG_MADT, acpi_apic_instance, &table_header);
> +     if (!table_header) {

... you should use the return value of the function instead of pre-
setting table_header to NULL and then checking whether it changed.

Jan


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