Build error in -next due to 'efi: Add esrt support'

So, I'm told this problem exists in the world:
----------------------------------------------
Subject: Build error in -next due to 'efi: Add esrt support'

Building ia64:defconfig ... failed
--------------
Error log:

drivers/firmware/efi/esrt.c:28:31: fatal error: asm/early_ioremap.h: No such file or directory
----------------------------------------------

I'm not really sure how it's okay that we have things in asm-generic on some platforms but not others - is having it the same everywhere not the whole point of asm-generic?

That said, ia64 doesn't have early-ioremap.h . So instead, since it's difficult to imagine new IA64 machines with UEFI 2.5, just don't build this code there.

To me this looks like a workaround - doing something like:

generic-y += early_ioremap.h

in arch/ia64/include/asm/Kbuild would appear to be more correct, but ia64 has its own early_memremap() decl in arch/ia64/include/asm/io.h , and it's a macro. So adding the above /and/ requiring that asm/io.h be included /after/ asm/early_ioremap.h in all cases would fix it, but that's pretty ugly as well. Since I'm not going to spend the rest of my life rectifying ia64 headers vs "generic" headers that aren't generic, it's much simpler to just not build there.

Note that I've only actually tried to build this patch on x86_64, but esrt.o still gets built there, and that would seem to demonstrate that the conditional building is working correctly at all the places the code built before. I no longer have any ia64 machines handy to test that the exclusion actually works there.

Signed-off-by Peter Jones <[email protected]>

---
 drivers/firmware/efi/Makefile | 5 ++++-
 include/linux/efi.h           | 4 ++++
 2 files changed, 8 insertions(+), 1 deletion(-)

drivers/firmware/efi/Makefile +0 -0

index 26eabbc..81c8527 100644

include/linux/efi.h +3 -0

+static inline void efi_esrt_init(void) { }
+#else
 extern void __init efi_esrt_init(void);
+#endif
 extern int efi_config_parse_tables(void *config_tables, int count, int sz,
 				   efi_config_table_type_t *arch_tables);
 extern u64 efi_get_iobase (void);

Signature · 1 line

2.4.2

Note that I've only actually tried to build this patch on x86_64, but esrt.o still gets built there, and that would seem to demonstrate that the conditional building is working correctly at all the places the code built before. I no longer have any ia64 machines handy to test that the exclusion actually works there.

Acked-by Tony Luck <[email protected]>

So, I'm told this problem exists in the world:
----------------------------------------------
Subject: Build error in -next due to 'efi: Add esrt support'

Building ia64:defconfig ... failed
--------------
Error log:

drivers/firmware/efi/esrt.c:28:31: fatal error: asm/early_ioremap.h: No such file or directory
----------------------------------------------

I'm not really sure how it's okay that we have things in asm-generic on some platforms but not others - is having it the same everywhere not the whole point of asm-generic?

That said, ia64 doesn't have early-ioremap.h . So instead, since it's difficult to imagine new IA64 machines with UEFI 2.5, just don't build this code there.

To me this looks like a workaround - doing something like:

generic-y += early_ioremap.h

in arch/ia64/include/asm/Kbuild would appear to be more correct, but ia64 has its own early_memremap() decl in arch/ia64/include/asm/io.h , and it's a macro. So adding the above /and/ requiring that asm/io.h be included /after/ asm/early_ioremap.h in all cases would fix it, but that's pretty ugly as well. Since I'm not going to spend the rest of my life rectifying ia64 headers vs "generic" headers that aren't generic, it's much simpler to just not build there.

Note that I've only actually tried to build this patch on x86_64, but esrt.o still gets built there, and that would seem to demonstrate that the conditional building is working correctly at all the places the code built before. I no longer have any ia64 machines handy to test that the exclusion actually works there.

Signed-off-by Peter Jones <[email protected]>

Acked-by Tony Luck <[email protected]>

So, I'm told this problem exists in the world:
----------------------------------------------
Subject: Build error in -next due to 'efi: Add esrt support'

Building ia64:defconfig ... failed
--------------
Error log:

drivers/firmware/efi/esrt.c:28:31: fatal error: asm/early_ioremap.h: No such file or directory
----------------------------------------------

I'm not really sure how it's okay that we have things in asm-generic on some platforms but not others - is having it the same everywhere not the whole point of asm-generic?

That said, ia64 doesn't have early-ioremap.h . So instead, since it's difficult to imagine new IA64 machines with UEFI 2.5, just don't build this code there.

To me this looks like a workaround - doing something like:

generic-y += early_ioremap.h

in arch/ia64/include/asm/Kbuild would appear to be more correct, but ia64 has its own early_memremap() decl in arch/ia64/include/asm/io.h , and it's a macro. So adding the above /and/ requiring that asm/io.h be included /after/ asm/early_ioremap.h in all cases would fix it, but that's pretty ugly as well. Since I'm not going to spend the rest of my life rectifying ia64 headers vs "generic" headers that aren't generic, it's much simpler to just not build there.

Note that I've only actually tried to build this patch on x86_64, but esrt.o still gets built there, and that would seem to demonstrate that the conditional building is working correctly at all the places the code built before. I no longer have any ia64 machines handy to test that the exclusion actually works there.

Signed-off-by Peter Jones <[email protected]>

Acked-by Tony Luck <[email protected]>

---
 drivers/firmware/efi/Kconfig  | 5 +++++
 drivers/firmware/efi/Makefile | 3 ++-
 include/linux/efi.h           | 4 ++++
 3 files changed, 11 insertions(+), 1 deletion(-)

drivers/firmware/efi/Kconfig +5 -0

index 8de4da5..54071c1 100644
@@ -18,6 +18,11 @@ config EFI_VARS
 	  Subsequent efibootmgr releases may be found at:
 	  <http://github.com/vathpela/efibootmgr>
 
+config EFI_ESRT
+	bool
+	depends on EFI && !IA64
+	default y
+
 config EFI_VARS_PSTORE
 	tristate "Register efivars backend for pstore"
 	depends on EFI_VARS && PSTORE

drivers/firmware/efi/Makefile +2 -1

index 26eabbc..6fd3da9 100644
@@ -1,8 +1,9 @@
 #
 # Makefile for linux kernel
 #
-obj-$(CONFIG_EFI)			+= efi.o esrt.o vars.o reboot.o
+obj-$(CONFIG_EFI)			+= efi.o vars.o reboot.o
 obj-$(CONFIG_EFI_VARS)			+= efivars.o
+obj-$(CONFIG_EFI_ESRT)			+= esrt.o
 obj-$(CONFIG_EFI_VARS_PSTORE)		+= efi-pstore.o
 obj-$(CONFIG_UEFI_CPER)			+= cper.o
 obj-$(CONFIG_EFI_RUNTIME_MAP)		+= runtime-map.o

include/linux/efi.h +4 -0

index 024c27e..2092965 100644
@@ -879,7 +879,11 @@ static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned lon
 #endif
 extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
 extern int efi_config_init(efi_config_table_type_t *arch_tables);
+#ifdef CONFIG_EFI_ESRT
 extern void __init efi_esrt_init(void);
+#else
+static inline void efi_esrt_init(void) { }
+#endif
 extern int efi_config_parse_tables(void *config_tables, int count, int sz,
 				   efi_config_table_type_t *arch_tables);
 extern u64 efi_get_iobase (void);

Signature · 1 line

2.4.2

Quoted 38 lines · Peter Jones

So, I'm told this problem exists in the world:
----------------------------------------------
Subject: Build error in -next due to 'efi: Add esrt support'

Building ia64:defconfig ... failed
--------------
Error log:

drivers/firmware/efi/esrt.c:28:31: fatal error: asm/early_ioremap.h: No such file or directory
----------------------------------------------

I'm not really sure how it's okay that we have things in asm-generic on some platforms but not others - is having it the same everywhere not the whole point of asm-generic?

That said, ia64 doesn't have early-ioremap.h . So instead, since it's difficult to imagine new IA64 machines with UEFI 2.5, just don't build this code there.

To me this looks like a workaround - doing something like:

generic-y += early_ioremap.h

in arch/ia64/include/asm/Kbuild would appear to be more correct, but ia64 has its own early_memremap() decl in arch/ia64/include/asm/io.h , and it's a macro. So adding the above /and/ requiring that asm/io.h be included /after/ asm/early_ioremap.h in all cases would fix it, but that's pretty ugly as well. Since I'm not going to spend the rest of my life rectifying ia64 headers vs "generic" headers that aren't generic, it's much simpler to just not build there.

Note that I've only actually tried to build this patch on x86_64, but esrt.o still gets built there, and that would seem to demonstrate that the conditional building is working correctly at all the places the code built before. I no longer have any ia64 machines handy to test that the exclusion actually works there.

Quoted 7 lines

Signed-off-by Peter Jones <[email protected]>

Acked-by Tony Luck <[email protected]>

---
 drivers/firmware/efi/Kconfig  | 5 +++++
 drivers/firmware/efi/Makefile | 3 ++-
 include/linux/efi.h           | 4 ++++
 3 files changed, 11 insertions(+), 1 deletion(-)

Thanks Peter, I picked this up with everyone's Ack/Test tags.

But now let's Cc some more people that can answer the questions you posed above, which would be the people mentioned in commit 9e5c33d7aeee ("mm: create generic early_ioremap() support").

Folks, is it legitimate to have headers in include/asm-generic/ that aren't available to all architectures? The build failure incurred by directly including asm/early_ioremap.h is noted above.

Quoted 51 lines

drivers/firmware/efi/Kconfig +5 -0

index 8de4da5..54071c1 100644
@@ -18,6 +18,11 @@ config EFI_VARS
 	  Subsequent efibootmgr releases may be found at:
 	  <http://github.com/vathpela/efibootmgr>
 
+config EFI_ESRT
+	bool
+	depends on EFI && !IA64
+	default y
+
 config EFI_VARS_PSTORE
 	tristate "Register efivars backend for pstore"
 	depends on EFI_VARS && PSTORE

drivers/firmware/efi/Makefile +2 -1

index 26eabbc..6fd3da9 100644
@@ -1,8 +1,9 @@
 #
 # Makefile for linux kernel
 #
-obj-$(CONFIG_EFI)			+= efi.o esrt.o vars.o reboot.o
+obj-$(CONFIG_EFI)			+= efi.o vars.o reboot.o
 obj-$(CONFIG_EFI_VARS)			+= efivars.o
+obj-$(CONFIG_EFI_ESRT)			+= esrt.o
 obj-$(CONFIG_EFI_VARS_PSTORE)		+= efi-pstore.o
 obj-$(CONFIG_UEFI_CPER)			+= cper.o
 obj-$(CONFIG_EFI_RUNTIME_MAP)		+= runtime-map.o

include/linux/efi.h +4 -0

index 024c27e..2092965 100644
@@ -879,7 +879,11 @@ static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned lon
 #endif
 extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
 extern int efi_config_init(efi_config_table_type_t *arch_tables);
+#ifdef CONFIG_EFI_ESRT
 extern void __init efi_esrt_init(void);
+#else
+static inline void efi_esrt_init(void) { }
+#endif
 extern int efi_config_parse_tables(void *config_tables, int count, int sz,
 				   efi_config_table_type_t *arch_tables);
 extern u64 efi_get_iobase (void);

Signature · 1 line

2.4.2