linux-kernel - [PATCH 1/3] fault-inject: improve build for CONFIG_FAULT

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Message-Id: <20240813121237.2382534-1-jani.nikula@intel.com>
Date: Tue, 13 Aug 2024 15:12:35 +0300
From: Jani Nikula <jani.nikula@...el.com>
To: linux-kernel@...r.kernel.org
Cc: intel-xe@...ts.freedesktop.org,
	linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	akinobu.mita@...il.com,
	akpm@...ux-foundation.org,
	lucas.demarchi@...el.com,
	rodrigo.vivi@...el.com,
	thomas.hellstrom@...ux.intel.com,
	robdclark@...il.com,
	quic_abhinavk@...cinc.com,
	dmitry.baryshkov@...aro.org,
	jani.nikula@...el.com
Subject: [PATCH 1/3] 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.

Cc: Akinobu Mita <akinobu.mita@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
---
 include/linux/fault-inject.h | 36 +++++++++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/include/linux/fault-inject.h b/include/linux/fault-inject.h
index 354413950d34..8c829d28dcf3 100644
--- 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
-- 
2.39.2