[PATCH] efi/arm: Don't expect a return value of ptdump_debugfs_register

[PATCH] efi/arm: Don't expect a return value of ptdump_debugfs_register

[Nathan Chancellor]

As of commit e2a2e56e4082 ("arm64: dump: no need to check return value
of debugfs_create functions") in the arm64 for-next/core branch,
ptdump_debugfs_register does not have a return value, which causes a
build error here:

drivers/firmware/efi/arm-runtime.c:51:9: error: returning 'void' from a
function with incompatible result type 'int'
        return ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

The arm version is still awaiting acceptance [1] but in anticipation
of that patch being merged, restructure this function to call
ptdump_debugfs_register without expecting a return value.

[1]: https://lore.kernel.org/lkml/20190122144114.9816-3-gregkh@linuxfoundation.org/

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/firmware/efi/arm-runtime.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 23ea1ed409d1..7ae3b797caf8 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -45,10 +45,10 @@ static struct ptdump_info efi_ptdump_info = {
 
 static int __init ptdump_init(void)
 {
-	if (!efi_enabled(EFI_RUNTIME_SERVICES))
-		return 0;
+	if (efi_enabled(EFI_RUNTIME_SERVICES))
+		ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
 
-	return ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
+	return 0;
 }
 device_initcall(ptdump_init);
 
-- 
2.20.1

Re: [PATCH] efi/arm: Don't expect a return value of ptdump_debugfs_register

[Ard Biesheuvel]

On Fri, 1 Feb 2019 at 20:21, Nathan Chancellor <natechancellor@gmail.com> wrote:
>
> As of commit e2a2e56e4082 ("arm64: dump: no need to check return value
> of debugfs_create functions") in the arm64 for-next/core branch,
> ptdump_debugfs_register does not have a return value, which causes a
> build error here:
>
> drivers/firmware/efi/arm-runtime.c:51:9: error: returning 'void' from a
> function with incompatible result type 'int'
>         return ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
>                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 1 error generated.
>
> The arm version is still awaiting acceptance [1] but in anticipation
> of that patch being merged, restructure this function to call
> ptdump_debugfs_register without expecting a return value.
>
> [1]: https://lore.kernel.org/lkml/20190122144114.9816-3-gregkh@linuxfoundation.org/
>
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>


Catalin, Will,

Could you please apply this directly?

> ---
>  drivers/firmware/efi/arm-runtime.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
> index 23ea1ed409d1..7ae3b797caf8 100644
> --- a/drivers/firmware/efi/arm-runtime.c
> +++ b/drivers/firmware/efi/arm-runtime.c
> @@ -45,10 +45,10 @@ static struct ptdump_info efi_ptdump_info = {
>
>  static int __init ptdump_init(void)
>  {
> -       if (!efi_enabled(EFI_RUNTIME_SERVICES))
> -               return 0;
> +       if (efi_enabled(EFI_RUNTIME_SERVICES))
> +               ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
>
> -       return ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
> +       return 0;
>  }
>  device_initcall(ptdump_init);
>
> --
> 2.20.1
>

Re: [PATCH] efi/arm: Don't expect a return value of ptdump_debugfs_register

[Will Deacon]

On Fri, Feb 01, 2019 at 11:18:22PM +0100, Ard Biesheuvel wrote:
> On Fri, 1 Feb 2019 at 20:21, Nathan Chancellor <natechancellor@gmail.com> wrote:
> >
> > As of commit e2a2e56e4082 ("arm64: dump: no need to check return value
> > of debugfs_create functions") in the arm64 for-next/core branch,
> > ptdump_debugfs_register does not have a return value, which causes a
> > build error here:
> >
> > drivers/firmware/efi/arm-runtime.c:51:9: error: returning 'void' from a
> > function with incompatible result type 'int'
> >         return ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
> >                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > 1 error generated.
> >
> > The arm version is still awaiting acceptance [1] but in anticipation
> > of that patch being merged, restructure this function to call
> > ptdump_debugfs_register without expecting a return value.
> >
> > [1]: https://lore.kernel.org/lkml/20190122144114.9816-3-gregkh@linuxfoundation.org/
> >
> > Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
> 
> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> 
> 
> Catalin, Will,
> 
> Could you please apply this directly?

Sure, we'll pick it up.

Will