}
}
+/*
+ * Recursion is tracked separately on each CPU. If NMIs are supported, an
+ * additional NMI context per CPU is also separately tracked. Until per-CPU
+ * is available, a separate "early tracking" is performed.
+ */
+static DEFINE_PER_CPU(u8, printk_count);
+static u8 printk_count_early;
+#ifdef CONFIG_HAVE_NMI
+static DEFINE_PER_CPU(u8, printk_count_nmi);
+static u8 printk_count_nmi_early;
+#endif
+
+/*
+ * Recursion is limited to keep the output sane. printk() should not require
+ * more than 1 level of recursion (allowing, for example, printk() to trigger
+ * a WARN), but a higher value is used in case some printk-internal errors
+ * exist, such as the ringbuffer validation checks failing.
+ */
+#define PRINTK_MAX_RECURSION 3
+
+/*
+ * Return a pointer to the dedicated counter for the CPU+context of the
+ * caller.
+ */
+static u8 *__printk_recursion_counter(void)
+{
+#ifdef CONFIG_HAVE_NMI
+ if (in_nmi()) {
+ if (printk_percpu_data_ready())
+ return this_cpu_ptr(&printk_count_nmi);
+ return &printk_count_nmi_early;
+ }
+#endif
+ if (printk_percpu_data_ready())
+ return this_cpu_ptr(&printk_count);
+ return &printk_count_early;
+}
+
+/*
+ * Enter recursion tracking. Interrupts are disabled to simplify tracking.
+ * The caller must check the boolean return value to see if the recursion is
+ * allowed. On failure, interrupts are not disabled.
+ *
+ * @recursion_ptr must be a variable of type (u8 *) and is the same variable
+ * that is passed to printk_exit_irqrestore().
+ */
+#define printk_enter_irqsave(recursion_ptr, flags) \
+({ \
+ bool success = true; \
+ \
+ typecheck(u8 *, recursion_ptr); \
+ local_irq_save(flags); \
+ (recursion_ptr) = __printk_recursion_counter(); \
+ if (*(recursion_ptr) > PRINTK_MAX_RECURSION) { \
+ local_irq_restore(flags); \
+ success = false; \
+ } else { \
+ (*(recursion_ptr))++; \
+ } \
+ success; \
+})
+
+/* Exit recursion tracking, restoring interrupts. */
+#define printk_exit_irqrestore(recursion_ptr, flags) \
+ do { \
+ typecheck(u8 *, recursion_ptr); \
+ (*(recursion_ptr))--; \
+ local_irq_restore(flags); \
+ } while (0)
+
int printk_delay_msec __read_mostly;
static inline void printk_delay(void)
struct prb_reserved_entry e;
enum log_flags lflags = 0;
struct printk_record r;
+ unsigned long irqflags;
u16 trunc_msg_len = 0;
char prefix_buf[8];
+ u8 *recursion_ptr;
u16 reserve_size;
va_list args2;
u16 text_len;
+ int ret = 0;
u64 ts_nsec;
/*
*/
ts_nsec = local_clock();
+ if (!printk_enter_irqsave(recursion_ptr, irqflags))
+ return 0;
+
/*
* The sprintf needs to come first since the syslog prefix might be
* passed in as a parameter. An extra byte must be reserved so that
prb_commit(&e);
}
- return text_len;
+ ret = text_len;
+ goto out;
}
}
prb_rec_init_wr(&r, reserve_size + trunc_msg_len);
if (!prb_reserve(&e, prb, &r))
- return 0;
+ goto out;
}
/* fill message */
else
prb_final_commit(&e);
- return (text_len + trunc_msg_len);
+ ret = text_len + trunc_msg_len;
+out:
+ printk_exit_irqrestore(recursion_ptr, irqflags);
+ return ret;
}
asmlinkage int vprintk_emit(int facility, int level,