Subject: Re: linux-next: build failure after merge of the mm tree

From: Andrew Morton <[email-masked]>
Date: Wed, 14 Aug 2024 17:08:03 -0700

On Thu, 15 Aug 2024 09:57:34 +1000 Stephen Rothwell <[email-masked]> wrote:

> Hi all,
> 
> After merging the mm tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
> 
> drivers/nvme/host/fault_inject.c: In function 'nvme_fault_inject_init':
> drivers/nvme/host/fault_inject.c:29:18: error: implicit declaration of function 'debugfs_create_dir'; did you mean 'kernfs_create_dir'? [-Werror=implicit-function-declaration]
>    29 |         parent = debugfs_create_dir(dev_name, NULL);
>       |                  ^~~~~~~~~~~~~~~~~~
>       |                  kernfs_create_dir
> 
> ...
>
> Caused by commit
> 
>   2771559a5531 ("fault-inject: improve build for CONFIG_FAULT_INJECTION=n")
> 
> ...
>
>  drivers/iommu/iommufd/selftest.c | 1 +
>  drivers/nvme/host/fault_inject.c | 1 +
>  kernel/futex/core.c              | 1 +
>  lib/fault-inject.c               | 1 +
>  mm/fail_page_alloc.c             | 1 +
>  mm/failslab.c                    | 1 +
>  6 files changed, 6 insertions(+)

Oh.  I think I got all these with
fault-inject-improve-build-for-config_fault_injection=n-fix.patch. 
Maybe that escaped somehow.

From: Andrew Morton <[email-masked]>
Subject: fault-inject-improve-build-for-config_fault_injection=n-fix
Date: Tue Aug 13 07:20:23 PM PDT 2024

repair fallout from no longer including debugfs.h into fault-inject.h

Cc: Abhinav Kumar <[email-masked]>
Cc: Akinobu Mita <[email-masked]>
Cc: Dmitry Baryshkov <[email-masked]>
Cc: Himal Prasad Ghimiray <[email-masked]>
Cc: Jani Nikula <[email-masked]>
Cc: Lucas De Marchi <[email-masked]>
Cc: Rob Clark <[email-masked]>
Cc: Rodrigo Vivi <[email-masked]>
Cc: Thomas Hellström <[email-masked]>
Signed-off-by: Andrew Morton <[email-masked]>
---

 drivers/iommu/iommufd/selftest.c |    1 +
 drivers/nvme/host/fault_inject.c |    1 +
 kernel/futex/core.c              |    1 +
 lib/fault-inject.c               |    1 +
 mm/fail_page_alloc.c             |    1 +
 mm/failslab.c                    |    1 +
 6 files changed, 6 insertions(+)

--- a/drivers/iommu/iommufd/selftest.c~fault-inject-improve-build-for-config_fault_injection=n-fix
+++ a/drivers/iommu/iommufd/selftest.c
@@ -7,6 +7,7 @@
 #include <linux/iommu.h>
 #include <linux/xarray.h>
 #include <linux/file.h>
+#include <linux/debugfs.h>
 #include <linux/anon_inodes.h>
 #include <linux/fault-inject.h>
 #include <linux/platform_device.h>
--- a/drivers/nvme/host/fault_inject.c~fault-inject-improve-build-for-config_fault_injection=n-fix
+++ a/drivers/nvme/host/fault_inject.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/moduleparam.h>
+#include <linux/debugfs.h>
 #include "nvme.h"
 
 static DECLARE_FAULT_ATTR(fail_default_attr);
--- a/kernel/futex/core.c~fault-inject-improve-build-for-config_fault_injection=n-fix
+++ a/kernel/futex/core.c
@@ -34,6 +34,7 @@
 #include <linux/compat.h>
 #include <linux/jhash.h>
 #include <linux/pagemap.h>
+#include <linux/debugfs.h>
 #include <linux/plist.h>
 #include <linux/memblock.h>
 #include <linux/fault-inject.h>
--- a/lib/fault-inject.c~fault-inject-improve-build-for-config_fault_injection=n-fix
+++ a/lib/fault-inject.c
@@ -2,6 +2,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/random.h>
+#include <linux/debugfs.h>
 #include <linux/sched.h>
 #include <linux/stat.h>
 #include <linux/types.h>
--- a/mm/fail_page_alloc.c~fault-inject-improve-build-for-config_fault_injection=n-fix
+++ a/mm/fail_page_alloc.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/fault-inject.h>
+#include <linux/debugfs.h>
 #include <linux/error-injection.h>
 #include <linux/mm.h>
 
--- a/mm/failslab.c~fault-inject-improve-build-for-config_fault_injection=n-fix
+++ a/mm/failslab.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/fault-inject.h>
 #include <linux/error-injection.h>
+#include <linux/debugfs.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include "slab.h"
_