wrapper/irqflags.h

   1 #ifndef _LTTNG_WRAPPER_IRQFLAGS_H
   2 #define _LTTNG_WRAPPER_IRQFLAGS_H
   3
   4 /*
   5  * wrapper/irqflags.h
   6  *
   7  * wrapper around IRQ flags.
   8  *
   9  * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; only
  14  * version 2.1 of the License.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <linux/version.h>
  27 #include <linux/irqflags.h>
  28
  29 #ifdef CONFIG_X86
  30
  31 static inline
  32 int lttng_regs_irqs_disabled(struct pt_regs *regs)
  33 {
  34         unsigned long flags = regs->flags;
  35
  36         return raw_irqs_disabled_flags(flags);
  37 }
  38
  39 #else
  40 /*
  41  * lttng_regs_irqs_disabled() returns -1 if irqoff state is unknown.
  42  * TODO: should implement lttng_regs_irqs_disabled for each architecture
  43  * to add interruptible context for kprobes and kretprobes.
  44  */
  45
  46 static inline
  47 int lttng_regs_irqs_disabled(struct pt_regs *regs)
  48 {
  49         return -1;
  50 }
  51 #endif
  52
  53 #endif /* _LTTNG_WRAPPER_IRQFLAGS_H */