arch/x86/include/bert_storage: introduce bert_should_generate_acpi_table

Since bert_errors_present() is only available when ACPI_BERT is selected
the ACPI table generation code needs to check that before calling the
function, so add bert_should_generate_acpi_table that returns false when
ACPI_BERT isn't selected or the return value of bert_errors_present()
when ACPI_BERT is selected.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ia955f627c190ea38e05b5aaedc7cb2d030274e83
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55024
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/x86/include/arch/bert_storage.h

@@ -56,6 +56,11 @@ void bert_errors_region(void **start, size_t *size);
 size_t bert_storage_remaining(void);
 /* Find if errors were added, a BERT region is present, and ACPI table needed */
 bool bert_errors_present(void);
+/* The BERT table should only be generated when BERT support is enabled and there's an error */
+static inline bool bert_should_generate_acpi_table(void)
+{
+	return CONFIG(ACPI_BERT) && bert_errors_present();
+}
 
 /* Get the number of entries associated with status */
 static inline size_t bert_entry_count(acpi_generic_error_status_t *status)

src/soc/amd/stoneyridge/northbridge.c

@@ -239,7 +239,7 @@ static unsigned long agesa_write_acpi_tables(const struct device *device,
 	current += hest->header.length;
 
 	/* BERT */
-	if (CONFIG(ACPI_BERT) && bert_errors_present()) {
+	if (bert_should_generate_acpi_table()) {
 		/* Skip the table if no errors are present.  ACPI driver reports
 		 * a table with a 0-length region:
 		 *   BERT: [Firmware Bug]: table invalid.