fault-inject: improve build for CONFIG_FAULT_INJECTION=n

The fault-inject.h users across the kernel need to add a lot of #ifdef
CONFIG_FAULT_INJECTION to cater for shortcomings in the header.  Make
fault-inject.h self-contained for CONFIG_FAULT_INJECTION=n, and add stubs
for DECLARE_FAULT_ATTR(), setup_fault_attr(), should_fail_ex(), and
should_fail() to allow removal of conditional compilation.

[akpm@linux-foundation.org: repair fallout from no longer including debugfs.h into fault-inject.h]
[akpm@linux-foundation.org: fix drivers/misc/xilinx_tmr_inject.c]
[akpm@linux-foundation.org: Add debugfs.h inclusion to more files, per Stephen]
Link: https://lkml.kernel.org/r/20240813121237.2382534-1-jani.nikula@intel.com
Fixes: 6ff1cb355e62 ("[PATCH] fault-injection capabilities infrastructure")
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 9c33f4e3f8229e473dc312bf7173e3e19bf621db..e018bc79e1888dac90fed6cbbbb16e2906da318f 100644 (file)
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -7,6 +7,7 @@
 
 #include <linux/dma-mapping.h>
 #include <linux/fault-inject.h>
+#include <linux/debugfs.h>
 #include <linux/of_address.h>
 #include <linux/uaccess.h>
 

diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 222cfc11ebfd00bdefdebed0e7eb967a6f42fe9a..db4032fecceeb88975cdd2baad027e102e33ad14 100644 (file)
--- a/drivers/iommu/iommufd/selftest.c
+++ b/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>

diff --git a/drivers/misc/xilinx_tmr_inject.c b/drivers/misc/xilinx_tmr_inject.c
index 73c6da7d09631088261cfb4e70a70650fd8cc1dc..734fdfac19ef3c5554a49d5749f7eb6a9342d014 100644 (file)
--- a/drivers/misc/xilinx_tmr_inject.c
+++ b/drivers/misc/xilinx_tmr_inject.c
@@ -12,6 +12,7 @@
 #include <asm/xilinx_mb_manager.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/debugfs.h>
 #include <linux/platform_device.h>
 #include <linux/fault-inject.h>
 

diff --git a/drivers/nvme/host/fault_inject.c b/drivers/nvme/host/fault_inject.c
index 1d1b6441a3398d2046455a55bd70cb82704c93a0..105d6cb41c72647d904494b1b37f56129a3c7b28 100644 (file)
--- a/drivers/nvme/host/fault_inject.c
+++ b/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);

diff --git a/drivers/ufs/core/ufs-fault-injection.c b/drivers/ufs/core/ufs-fault-injection.c
index 1695404170790d2a41bdd5da4d91b35216fb594a..55db38e75cc47a5cc9ece96e8268465b1b89c4d0 100644 (file)
--- a/drivers/ufs/core/ufs-fault-injection.c
+++ b/drivers/ufs/core/ufs-fault-injection.c
@@ -3,6 +3,7 @@
 #include <linux/kconfig.h>
 #include <linux/types.h>
 #include <linux/fault-inject.h>
+#include <linux/debugfs.h>
 #include <linux/module.h>
 #include <ufs/ufshcd.h>
 #include "ufs-fault-injection.h"

diff --git a/include/linux/fault-inject.h b/include/linux/fault-inject.h
index 354413950d34b74dddc94648420fe0157ba59620..8c829d28dcf356976c6906a1837457d3d64513cd 100644 (file)
--- a/include/linux/fault-inject.h
+++ b/include/linux/fault-inject.h
@@ -2,13 +2,17 @@
 #ifndef _LINUX_FAULT_INJECT_H
 #define _LINUX_FAULT_INJECT_H
 
+#include <linux/err.h>
+#include <linux/types.h>
+
+struct dentry;
+struct kmem_cache;
+
 #ifdef CONFIG_FAULT_INJECTION
 
-#include <linux/types.h>
-#include <linux/debugfs.h>
+#include <linux/atomic.h>
 #include <linux/configfs.h>
 #include <linux/ratelimit.h>
-#include <linux/atomic.h>
 
 /*
  * For explanation of the elements of this struct, see
@@ -51,6 +55,28 @@ int setup_fault_attr(struct fault_attr *attr, char *str);
 bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags);
 bool should_fail(struct fault_attr *attr, ssize_t size);
 
+#else /* CONFIG_FAULT_INJECTION */
+
+struct fault_attr {
+};
+
+#define DECLARE_FAULT_ATTR(name) struct fault_attr name = {}
+
+static inline int setup_fault_attr(struct fault_attr *attr, char *str)
+{
+       return 0; /* Note: 0 means error for __setup() handlers! */
+}
+static inline bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags)
+{
+       return false;
+}
+static inline bool should_fail(struct fault_attr *attr, ssize_t size)
+{
+       return false;
+}
+
+#endif /* CONFIG_FAULT_INJECTION */
+
 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
 
 struct dentry *fault_create_debugfs_attr(const char *name,
@@ -87,10 +113,6 @@ static inline void fault_config_init(struct fault_config *config,
 
 #endif /* CONFIG_FAULT_INJECTION_CONFIGFS */
 
-#endif /* CONFIG_FAULT_INJECTION */
-
-struct kmem_cache;
-
 #ifdef CONFIG_FAIL_PAGE_ALLOC
 bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
 #else

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 88c6a76042ee73ccbbb9dba4205d55b7a92ba8c1..49470188fca798654b9ee4b179a558278a590328 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -10,6 +10,7 @@
 #include <linux/sched.h>
 #include <linux/device.h>
 #include <linux/fault-inject.h>
+#include <linux/debugfs.h>
 
 #include <linux/mmc/core.h>
 #include <linux/mmc/card.h>

diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 0fd2aebac72862e789a54e12803a45077d86cdd7..3f68ae3e4330dc9e3d2889062a1dc455b3051ab0 100644 (file)
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -17,6 +17,7 @@
 #include <linux/blk-mq.h>
 #include <linux/devfreq.h>
 #include <linux/fault-inject.h>
+#include <linux/debugfs.h>
 #include <linux/msi.h>
 #include <linux/pm_runtime.h>
 #include <linux/dma-direction.h>

diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index 06a1f091be81d84759245630c0d25500563c66ea..136768ae26375fafcebf8815ae965f13a3161adf 100644 (file)
--- a/kernel/futex/core.c
+++ b/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>

diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index d608f9b48c10069a3e701f610249c4cca0eb4fd9..52eb6ba29698446a39d80bed6a0e2bf4297234b5 100644 (file)
--- a/lib/fault-inject.c
+++ b/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>

diff --git a/mm/fail_page_alloc.c b/mm/fail_page_alloc.c
index 532851ce513223446178cbeb011790ec5fa3bf7f..7647096170e96130fc5146662b4a0a0ab324b5a8 100644 (file)
--- a/mm/fail_page_alloc.c
+++ b/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>
 

diff --git a/mm/failslab.c b/mm/failslab.c
index af16c2ed578f68a0eb164c0a05a0ec2cc2fd91cf..c3901b13649811f45ccad50d3f89b261a54ac9d9 100644 (file)
--- a/mm/failslab.c
+++ b/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"