kernel debug: support resetting WARN*_ONCE

I like _ONCE warnings because it's guaranteed that they don't flood the
log.

During testing I find it useful to reset the state of the once warnings,
so that I can rerun tests and see if they trigger again, or can
guarantee that a test run always hits the same warnings.

This patch adds a debugfs interface to reset all the _ONCE warnings so
that they appear again:

  echo 1 > /sys/kernel/debug/clear_warn_once

This is implemented by putting all the warning booleans into a special
section, and clearing it.

[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/20171017221455.6740-1-andi@firstfloor.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/clearing-warn-once.txt b/Documentation/clearing-warn-once.txt
new file mode 100644 (file)
index 0000000..5b1f5d5
--- /dev/null
+++ b/Documentation/clearing-warn-once.txt
@@ -0,0 +1,7 @@
+
+WARN_ONCE / WARN_ON_ONCE only print a warning once.
+
+echo 1 > /sys/kernel/debug/clear_warn_once
+
+clears the state and allows the warnings to print once again.
+This can be useful after test suite runs to reproduce problems.

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index af2cc94..7844b0d 100644 (file)
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -130,7 +130,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 
 #ifndef WARN_ON_ONCE
 #define WARN_ON_ONCE(condition)        ({                              \
-       static bool __section(.data.unlikely) __warned;         \
+       static bool __section(.data.once) __warned;             \
        int __ret_warn_once = !!(condition);                    \
                                                                \
        if (unlikely(__ret_warn_once && !__warned)) {           \
@@ -142,7 +142,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 #endif
 
 #define WARN_ONCE(condition, format...)        ({                      \
-       static bool __section(.data.unlikely) __warned;         \
+       static bool __section(.data.once) __warned;             \
        int __ret_warn_once = !!(condition);                    \
                                                                \
        if (unlikely(__ret_warn_once && !__warned)) {           \
@@ -153,7 +153,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 })
 
 #define WARN_TAINT_ONCE(condition, taint, format...)   ({      \
-       static bool __section(.data.unlikely) __warned;         \
+       static bool __section(.data.once) __warned;             \
        int __ret_warn_once = !!(condition);                    \
                                                                \
        if (unlikely(__ret_warn_once && !__warned)) {           \

diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index 6d95769..03cc5f9 100644 (file)
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -44,6 +44,7 @@ extern char __entry_text_start[], __entry_text_end[];
 extern char __start_rodata[], __end_rodata[];
 extern char __irqentry_text_start[], __irqentry_text_end[];
 extern char __softirqentry_text_start[], __softirqentry_text_end[];
+extern char __start_once[], __end_once[];
 
 /* Start and end of .ctors section - used for constructor calls. */
 extern char __ctors_start[], __ctors_end[];

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index bdcd1ca..ee8b707 100644 (file)
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -223,6 +223,9 @@
        MEM_KEEP(init.data)                                             \
        MEM_KEEP(exit.data)                                             \
        *(.data.unlikely)                                               \
+       VMLINUX_SYMBOL(__start_once) = .;                               \
+       *(.data.once)                                                   \
+       VMLINUX_SYMBOL(__end_once) = .;                                 \
        STRUCT_ALIGN();                                                 \
        *(__tracepoints)                                                \
        /* implement dynamic printk debug */                            \

diff --git a/kernel/panic.c b/kernel/panic.c
index bdd18af..672a91d 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -27,6 +27,8 @@
 #include <linux/console.h>
 #include <linux/bug.h>
 #include <linux/ratelimit.h>
+#include <linux/debugfs.h>
+#include <asm/sections.h>
 
 #define PANIC_TIMER_STEP 100
 #define PANIC_BLINK_SPD 18
@@ -587,6 +589,32 @@ void warn_slowpath_null(const char *file, int line)
 EXPORT_SYMBOL(warn_slowpath_null);
 #endif
 
+#ifdef CONFIG_BUG
+
+/* Support resetting WARN*_ONCE state */
+
+static int clear_warn_once_set(void *data, u64 val)
+{
+       memset(__start_once, 0, __end_once - __start_once);
+       return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(clear_warn_once_fops,
+                       NULL,
+                       clear_warn_once_set,
+                       "%lld\n");
+
+static __init int register_warn_debugfs(void)
+{
+       /* Don't care about failure */
+       debugfs_create_file("clear_warn_once", 0644, NULL,
+                           NULL, &clear_warn_once_fops);
+       return 0;
+}
+
+device_initcall(register_warn_debugfs);
+#endif
+
 #ifdef CONFIG_CC_STACKPROTECTOR
 
 /*