| Message ID | ba1e799968e59a07964a7e693d623b41e6d62110.1386316208.git.lv.zheng@intel.com |
|---|---|
| State | Not Applicable |
| Headers | show |
Hi, > From: Zheng, Lv > Sent: Friday, December 06, 2013 4:52 PM > To: Wysocki, Rafael J; Brown, Len > > 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] Let me say something about this error messages. Someone may face difficulties to reproduce it. Currently, this message cannot be seen in any kernel build. This is because this patch series doesn't include a fix to remove <acpi/acpi.h> inclusion from linux/sfi_acpi.h. To achieve this, I have offered 2 options: 1. Redefining ACPICA table stuff for CONFIG_ACPI=n environment, or 2. Implementing stubs for all ACPICA functions/globals/macros and introducing <linux/acpica.h> (where acpi/acpi.h is included) as a top level header. 3. Other solutions... If we choose solution 1, then this issue is exposed by a build test where CONFIG_ACPI=n and CONFIG_SFI=y. Since we haven't decided what to do for the table structures and it is really not a good approach to achieve the build safety for mmconfig-share.c by relying on link-stage optimization rather than compile-stage referencing. IMO, we need to sort it out, thus I make it a part of this patchset. Well, if we choose solution 2, this patch can only help to reduce the size of the kernel image. Thanks and best regards -Lv > > 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@intel.com> > 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@intel.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Len Brown <lenb@kernel.org> > Cc: Feng Tang <feng.tang@intel.com> > Cc: sfi-devel@simplefirmware.org > Cc: linux-pci@vger.kernel.org > --- > 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 248642f..2c04b22 100644 > --- a/arch/x86/pci/mmconfig-shared.c > +++ b/arch/x86/pci/mmconfig-shared.c > @@ -369,6 +369,7 @@ 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; > @@ -435,6 +436,12 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, Dec 06, 2013 at 02:53:00PM +0000, Zheng, Lv wrote: > Hi, > > > From: Zheng, Lv > > Sent: Friday, December 06, 2013 4:52 PM > > To: Wysocki, Rafael J; Brown, Len > > > > 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] > > Let me say something about this error messages. Someone may face difficulties to reproduce it. > Currently, this message cannot be seen in any kernel build. > This is because this patch series doesn't include a fix to remove <acpi/acpi.h> inclusion from linux/sfi_acpi.h. > To achieve this, I have offered 2 options: > 1. Redefining ACPICA table stuff for CONFIG_ACPI=n environment, or > 2. Implementing stubs for all ACPICA functions/globals/macros and introducing <linux/acpica.h> (where acpi/acpi.h is included) as a top level header. > 3. Other solutions... > > If we choose solution 1, then this issue is exposed by a build test where CONFIG_ACPI=n and CONFIG_SFI=y. > Since we haven't decided what to do for the table structures and it is really not a good approach to achieve the build safety for mmconfig-share.c by relying on link-stage optimization rather than compile-stage referencing. IMO, we need to sort it out, thus I make it a part of this patchset. > > Well, if we choose solution 2, this patch can only help to reduce the size of the kernel image. OK, I assume you will make sure one of these fixes gets merged before the change that causes the breakage, so bisection continues to work. Therefore, I think it's best if both changes are merged through the same tree, and I won't apply this via the PCI tree. Let me know if you need me to do something. Bjorn > > > > 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@intel.com> > > 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@intel.com> > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > Cc: Len Brown <lenb@kernel.org> > > Cc: Feng Tang <feng.tang@intel.com> > > Cc: sfi-devel@simplefirmware.org > > Cc: linux-pci@vger.kernel.org > > --- > > 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 248642f..2c04b22 100644 > > --- a/arch/x86/pci/mmconfig-shared.c > > +++ b/arch/x86/pci/mmconfig-shared.c > > @@ -369,6 +369,7 @@ 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; > > @@ -435,6 +436,12 @@ 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Monday, December 09, 2013 04:15:15 PM Bjorn Helgaas wrote: > On Fri, Dec 06, 2013 at 02:53:00PM +0000, Zheng, Lv wrote: > > Hi, > > > > > From: Zheng, Lv > > > Sent: Friday, December 06, 2013 4:52 PM > > > To: Wysocki, Rafael J; Brown, Len > > > > > > 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] > > > > Let me say something about this error messages. Someone may face difficulties to reproduce it. > > Currently, this message cannot be seen in any kernel build. > > This is because this patch series doesn't include a fix to remove <acpi/acpi.h> inclusion from linux/sfi_acpi.h. > > To achieve this, I have offered 2 options: > > 1. Redefining ACPICA table stuff for CONFIG_ACPI=n environment, or > > 2. Implementing stubs for all ACPICA functions/globals/macros and introducing <linux/acpica.h> (where acpi/acpi.h is included) as a top level header. > > 3. Other solutions... > > > > If we choose solution 1, then this issue is exposed by a build test where CONFIG_ACPI=n and CONFIG_SFI=y. > > Since we haven't decided what to do for the table structures and it is really not a good approach to achieve the build safety for mmconfig-share.c by relying on link-stage optimization rather than compile-stage referencing. IMO, we need to sort it out, thus I make it a part of this patchset. > > > > Well, if we choose solution 2, this patch can only help to reduce the size of the kernel image. > > OK, I assume you will make sure one of these fixes gets merged before the > change that causes the breakage, so bisection continues to work. > Therefore, I think it's best if both changes are merged through the same > tree, and I won't apply this via the PCI tree. Let me know if you need me > to do something. We're doing our best not to break compilation between the patches in this series. And I'll take care of it. :-) Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c index 248642f..2c04b22 100644 --- a/arch/x86/pci/mmconfig-shared.c +++ b/arch/x86/pci/mmconfig-shared.c @@ -369,6 +369,7 @@ 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; @@ -435,6 +436,12 @@ 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);
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@intel.com> 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@intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Len Brown <lenb@kernel.org> Cc: Feng Tang <feng.tang@intel.com> Cc: sfi-devel@simplefirmware.org Cc: linux-pci@vger.kernel.org --- arch/x86/pci/mmconfig-shared.c | 7 +++++++ 1 file changed, 7 insertions(+)