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

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Date:	Sun, 10 Jan 2016 11:39:33 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
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 01/10/2016 09:31 AM, Ard Biesheuvel wrote:
> 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?
>
#include <asm/io.h>

I'll check if that works for all architectures.

Guenter

>>> ---
>>>   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
>>>
>