linux-kernel - [PATCH] efi/arm: Don't expect a return value of ptdump_debugfs

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Message-Id: <20190201192001.6495-1-natechancellor@gmail.com>
Date:   Fri,  1 Feb 2019 12:20:01 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] efi/arm: Don't expect a return value of ptdump_debugfs_register

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@...il.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