linux-kernel - [PATCH 3/4 -next] fault-injection: make some stack filter attrs more readable

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Date:   Wed, 17 Aug 2022 08:03:31 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Akinobu Mita <akinobu.mita@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Isabella Basso <isabbasso@...eup.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
CC:     Wei Yongjun <weiyongjun1@...wei.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/4 -next] fault-injection: make some stack filter attrs more readable

Attributes of stack filter are show as unsigned decimal, such
as 'require-start', 'require-end'. This patch change to
show them as unsigned hexadecimal for more readable.

Before:
  $ echo 0xffffffffc0257000 > /sys/kernel/debug/failslab/require-start
  $ cat /sys/kernel/debug/failslab/require-start
  18446744072638263296

After:
  $ echo 0xffffffffc0257000 > /sys/kernel/debug/failslab/require-start
  $ cat /sys/kernel/debug/failslab/require-start
  0xffffffffc0257000

Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 lib/fault-inject.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index 515fc5aaf032..deca05e7c9b3 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -179,6 +179,14 @@ static void debugfs_create_ul(const char *name, umode_t mode,
 
 #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
 
+DEFINE_SIMPLE_ATTRIBUTE(fops_xl, debugfs_ul_get, debugfs_ul_set, "0x%llx\n");
+
+static void debugfs_create_xl(const char *name, umode_t mode,
+			      struct dentry *parent, unsigned long *value)
+{
+	debugfs_create_file(name, mode, parent, value, &fops_xl);
+}
+
 static int debugfs_stacktrace_depth_set(void *data, u64 val)
 {
 	*(unsigned long *)data =
@@ -223,10 +231,10 @@ struct dentry *fault_create_debugfs_attr(const char *name,
 #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
 	debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
 					&attr->stacktrace_depth);
-	debugfs_create_ul("require-start", mode, dir, &attr->require_start);
-	debugfs_create_ul("require-end", mode, dir, &attr->require_end);
-	debugfs_create_ul("reject-start", mode, dir, &attr->reject_start);
-	debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);
+	debugfs_create_xl("require-start", mode, dir, &attr->require_start);
+	debugfs_create_xl("require-end", mode, dir, &attr->require_end);
+	debugfs_create_xl("reject-start", mode, dir, &attr->reject_start);
+	debugfs_create_xl("reject-end", mode, dir, &attr->reject_end);
 #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
 
 	attr->dname = dget(dir);
-- 
2.34.1