linux-kernel - Re: [PATCH 1/1] fs: debugfs: fix build error at powerpc platform

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Message-ID: <ZRlWeeq/AOjyTtnV@MiWiFi-R3L-srv>
Date:   Sun, 1 Oct 2023 19:22:33 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Frank Li <Frank.Li@....com>
Cc:     vkoul@...nel.org, dmaengine@...r.kernel.org,
        gregkh@...uxfoundation.org, arnd@...db.de, imx@...ts.linux.dev,
        linux-kernel@...r.kernel.org, lkp@...el.com,
        oe-kbuild-all@...ts.linux.dev, rafael@...nel.org
Subject: Re: [PATCH 1/1] fs: debugfs: fix build error at powerpc platform

On 09/29/23 at 12:49pm, Frank Li wrote:
>    ld: fs/debugfs/file.o: in function `debugfs_print_regs':
>    file.c:(.text+0x95a): undefined reference to `ioread64be'
> >> ld: file.c:(.text+0x9dd): undefined reference to `ioread64'

>From your reproducer, on x86_64, GENERIC_IOMAP is selected. So the
default version of ioread64 and ioread64be in asm-generic/io.h are
bypassed. Except of those arch where ioread64 and ioread64be are
implemented specifically like alpha, arm64, parisc, power, we may need
include include/linux/io-64-nonatomic-hi-lo.h or
include/linux/io-64-nonatomic-lo-hi.h to fix above linking issue?

>From my side, below change can fix the issue. However, I am not quite
sure which one is chosen between io-64-nonatomic-hi-lo.h and 
io-64-nonatomic-hi-lo.h.

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 87b3753aa4b1..b433be134c67 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -15,6 +15,7 @@
 #include <linux/pagemap.h>
 #include <linux/debugfs.h>
 #include <linux/io.h>
+#include <linux/io-64-nonatomic-hi-lo.h>
 #include <linux/slab.h>
 #include <linux/atomic.h>
 #include <linux/device.h>
-- 
2.41.0