linux-kernel - [PATCH v2 1/2] error-injection: Remove EI_ETYPE

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Date:   Tue, 13 Dec 2022 23:11:21 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     bpf@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        KP Singh <kpsingh@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Florent Revest <revest@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Chris Mason <clm@...a.com>, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org, Akinobu Mita <akinobu.mita@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: [PATCH v2 1/2] error-injection: Remove EI_ETYPE_NONE

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Since the EI_ETYPE_NONE is confusing type, replace it with appropriate
errno. The EI_ETYPE_NONE has been introduced for a dummy (error) value,
but it can mislead people that they can use ALLOW_ERROR_INJECTION(func,
NONE). So remove it from the EI_ETYPE and use appropriate errno instead.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Fixes: 663faf9f7bee ("error-injection: Add injectable error types")
---
 Changes in v2:
  - include linux/errno.h
---
 include/asm-generic/error-injection.h |    1 -
 include/linux/error-injection.h       |    3 ++-
 lib/error-inject.c                    |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/asm-generic/error-injection.h b/include/asm-generic/error-injection.h
index fbca56bd9cbc..c0b9d3217ed9 100644
--- a/include/asm-generic/error-injection.h
+++ b/include/asm-generic/error-injection.h
@@ -4,7 +4,6 @@
 
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 enum {
-	EI_ETYPE_NONE,		/* Dummy value for undefined case */
 	EI_ETYPE_NULL,		/* Return NULL if failure */
 	EI_ETYPE_ERRNO,		/* Return -ERRNO if failure */
 	EI_ETYPE_ERRNO_NULL,	/* Return -ERRNO or NULL if failure */
diff --git a/include/linux/error-injection.h b/include/linux/error-injection.h
index 635a95caf29f..20e738f4eae8 100644
--- a/include/linux/error-injection.h
+++ b/include/linux/error-injection.h
@@ -3,6 +3,7 @@
 #define _LINUX_ERROR_INJECTION_H
 
 #include <linux/compiler.h>
+#include <linux/errno.h>
 #include <asm-generic/error-injection.h>
 
 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
@@ -19,7 +20,7 @@ static inline bool within_error_injection_list(unsigned long addr)
 
 static inline int get_injectable_error_type(unsigned long addr)
 {
-	return EI_ETYPE_NONE;
+	return -EOPNOTSUPP;
 }
 
 #endif
diff --git a/lib/error-inject.c b/lib/error-inject.c
index 1afca1b1cdea..32c14770508e 100644
--- a/lib/error-inject.c
+++ b/lib/error-inject.c
@@ -40,7 +40,7 @@ bool within_error_injection_list(unsigned long addr)
 int get_injectable_error_type(unsigned long addr)
 {
 	struct ei_entry *ent;
-	int ei_type = EI_ETYPE_NONE;
+	int ei_type = -EINVAL;
 
 	mutex_lock(&ei_mutex);
 	list_for_each_entry(ent, &error_injection_list, list) {