linux-kernel - Re: [PATCH -next] efi: Do not include asm/efi.h if not needed

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Date:	Sun, 10 Jan 2016 18:31:14 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH -next] efi: Do not include asm/efi.h if not needed

On 10 January 2016 at 18:02, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> On 10 January 2016 at 16:35, Guenter Roeck <linux@...ck-us.net> wrote:
>> Commit f7d924894265 ("arm64/efi: refactor EFI init and runtime code
>> for reuse by 32-bit ARM") adds an include of asm/efi.h to efi.c.
>> This causes a build failure for ia64, where asm/efi.h does not exist.
>>
>> drivers/firmware/efi/efi.c:28:21: fatal error:
>>         asm/efi.h: No such file or directory
>>
>> asm/efi.h does not define or declare anything used by efi.c, thus
>> including it should not be needed.
>>
>> Fixes: f7d924894265 ("arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM")
>> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>> Cc: Will Deacon <will.deacon@....com>
>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
>
> This fixes ia64 but breaks ARM
>
> drivers/firmware/efi/efi.c: In function ‘efi_mem_desc_lookup’:
> drivers/firmware/efi/efi.c:291:3: error: implicit declaration of
> function ‘early_memremap’ [-Werror=implicit-function-declaration]
> drivers/firmware/efi/efi.c:291:6: warning: assignment makes pointer
> from integer without a cast [enabled by default]
> drivers/firmware/efi/efi.c:301:4: error: implicit declaration of
> function ‘early_memunmap’ [-Werror=implicit-function-declaration]
> drivers/firmware/efi/efi.c: In function ‘efi_config_parse_tables’:
> drivers/firmware/efi/efi.c:404:7: warning: assignment makes pointer
> from integer without a cast [enabled by default]
> drivers/firmware/efi/efi.c: In function ‘efi_config_init’:
> drivers/firmware/efi/efi.c:433:16: warning: assignment makes pointer
> from integer without a cast [enabled by default]
>

This means efi.c should include <asm/early_ioremap.h> but that does
not exist on ia64 either.
Perhaps add a #ifdef CONFIG_IA64?

>> ---
>>  drivers/firmware/efi/efi.c | 2 --
>>  1 file changed, 2 deletions(-)
>>
>> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
>> index cffa89b3317b..027ca212179f 100644
>> --- a/drivers/firmware/efi/efi.c
>> +++ b/drivers/firmware/efi/efi.c
>> @@ -25,8 +25,6 @@
>>  #include <linux/io.h>
>>  #include <linux/platform_device.h>
>>
>> -#include <asm/efi.h>
>> -
>>  struct efi __read_mostly efi = {
>>         .mps                    = EFI_INVALID_TABLE_ADDR,
>>         .acpi                   = EFI_INVALID_TABLE_ADDR,
>> --
>> 2.1.4
>>