In Linux kernel, ACPICA is wrapped and safely exported by CONFIG_ACPI. So
all external modules should depend on CONFIG_ACPI rather than using ACPICA
header directly for stubbing. But if we moves <acpi/acpi.h> inclusions
into "#ifdef CONFIG_ACPI", build breakge can help to detect wrong ACPICA
dependent modules.
One of the build breakage is:
arch/x86/pci/mmconfig-shared.c:389:1: error: unknown type name 'acpi_status'
arch/x86/pci/mmconfig-shared.c:389:47: warning: 'struct acpi_resource' declared inside parameter list [enabled by default]
arch/x86/pci/mmconfig-shared.c:389:47: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
arch/x86/pci/mmconfig-shared.c: In function 'check_mcfg_resource':
arch/x86/pci/mmconfig-shared.c:392:33: error: storage size of 'address' isn't known
arch/x86/pci/mmconfig-shared.c:393:2: error: unknown type name 'acpi_status'
arch/x86/pci/mmconfig-shared.c:395:9: error: dereferencing pointer to incomplete type
arch/x86/pci/mmconfig-shared.c:395:19: error: 'ACPI_RESOURCE_TYPE_FIXED_MEMORY32' undeclared (first use in this function)
arch/x86/pci/mmconfig-shared.c:395:19: note: each undeclared identifier is reported only once for each function it appears in
arch/x86/pci/mmconfig-shared.c:397:8: error: dereferencing pointer to incomplete type
arch/x86/pci/mmconfig-shared.c:399:11: error: 'AE_OK' undeclared (first use in this function)
arch/x86/pci/mmconfig-shared.c:400:35: error: dereferencing pointer to incomplete type
arch/x86/pci/mmconfig-shared.c:401:33: error: dereferencing pointer to incomplete type
arch/x86/pci/mmconfig-shared.c:402:19: error: dereferencing pointer to incomplete type
arch/x86/pci/mmconfig-shared.c:404:11: error: 'AE_CTRL_TERMINATE' undeclared (first use in this function)
arch/x86/pci/mmconfig-shared.c:407:10: error: dereferencing pointer to incomplete type
arch/x86/pci/mmconfig-shared.c:407:20: error: 'ACPI_RESOURCE_TYPE_ADDRESS32' undeclared (first use in this function)
arch/x86/pci/mmconfig-shared.c:408:10: error: dereferencing pointer to incomplete type
arch/x86/pci/mmconfig-shared.c:408:20: error: 'ACPI_RESOURCE_TYPE_ADDRESS64' undeclared (first use in this function)
arch/x86/pci/mmconfig-shared.c:411:2: error: implicit declaration of function 'acpi_resource_to_address64' [-Werror=implicit-function-declaration]
arch/x86/pci/mmconfig-shared.c:412:2: error: implicit declaration of function 'ACPI_FAILURE' [-Werror=implicit-function-declaration]
arch/x86/pci/mmconfig-shared.c:414:31: error: 'ACPI_MEMORY_RANGE' undeclared (first use in this function)
arch/x86/pci/mmconfig-shared.c:392:33: warning: unused variable 'address' [-Wunused-variable]
arch/x86/pci/mmconfig-shared.c: At top level:
arch/x86/pci/mmconfig-shared.c:425:1: error: unknown type name 'acpi_status'
arch/x86/pci/mmconfig-shared.c:425:41: error: unknown type name 'acpi_handle'
arch/x86/pci/mmconfig-shared.c: In function 'is_acpi_reserved':
arch/x86/pci/mmconfig-shared.c:447:2: error: implicit declaration of function 'acpi_get_devices' [-Werror=implicit-function-declaration]
arch/x86/pci/mmconfig-shared.c:447:30: error: 'find_mboard_resource' undeclared (first use in this function)
arch/x86/pci/mmconfig-shared.c: At top level:
arch/x86/pci/mmconfig-shared.c:389:20: warning: 'check_mcfg_resource' defined but not used [-Wunused-function]
The root cause of this breakage is:
1. The following commit doesn't protect ACPICA functions like
acpi_get_devices()/acpi_walk_resources()/acpi_resource_to_address64() in
CONFIG_SFI=y and CONFIG_ACPI=n environment:
Commit: 5f0db7a2fb78895a197f64e548333b3bbd433996
Author: Feng Tang <feng.tang@xxxxxxxxx>
Subject: SFI: Hook PCI MMCONFIG
First check ACPI, and if that fails, ask SFI to find the MCFG.
So it actually depends on the logic that in !CONFIG_ACPI builds, code
blocks under "if (!acpi_disabled)" will not be linked in.
This patch fixes this issue by introducing a stub for MCFG entry checker
is_acpi_reserved() in !CONFIG_ACPI builds.
Signed-off-by: Lv Zheng <lv.zheng@xxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: Feng Tang <feng.tang@xxxxxxxxx>
Cc: sfi-devel@xxxxxxxxxxxxxxxxxx
Cc: linux-pci@xxxxxxxxxxxxxxx
---
arch/x86/pci/mmconfig-shared.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 082e881..9f23a77 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -370,6 +370,7 @@ static int __init pci_mmcfg_check_hostbridge(void)
return !list_empty(&pci_mmcfg_list);
}
+#ifdef CONFIG_ACPI
static acpi_status check_mcfg_resource(struct acpi_resource *res, void *data)
{
struct resource *mcfg_res = data;
@@ -436,6 +437,12 @@ static int is_acpi_reserved(u64 start, u64 end, unsigned not_used)
return mcfg_res.flags;
}
+#else
+static inline int is_acpi_reserved(u64 start, u64 end, unsigned not_used)
+{
+ return 0;
+}
+#endif
typedef int (*check_reserved_t)(u64 start, u64 end, unsigned type);
--
1.7.10
--
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