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authorAndy Lutomirski <luto@kernel.org>2016-03-22 14:24:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-22 15:36:02 -0700
commit5180e3e24fd3e8e7ea46fbe21e10f5ea3fb1edaa (patch)
treeba5283961497ff4608eecf8e620ffbd1fd4b2462 /include/linux/compat.h
parentb4aa14a63cb3194d8eab355fcee194838ab09121 (diff)
compat: add in_compat_syscall to ask whether we're in a compat syscall
A lot of code currently abuses is_compat_task to determine this. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Clemens Ladisch <clemens@ladisch.de> Cc: David Airlie <airlied@linux.ie> Cc: David Herrmann <dh.herrmann@googlemail.com> Cc: David Miller <davem@davemloft.net> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Eric Paris <eparis@redhat.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Jiri Kosina <jkosina@suse.cz> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Oded Gabbay <oded.gabbay@gmail.com> Cc: Oleg Drokin <oleg.drokin@intel.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul Moore <paul@paul-moore.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/compat.h')
-rw-r--r--include/linux/compat.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/compat.h b/include/linux/compat.h
index fe4ccd0c748a..f964ef79e0ad 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -5,6 +5,8 @@
* syscall compatibility layer.
*/
+#include <linux/types.h>
+
#ifdef CONFIG_COMPAT
#include <linux/stat.h>
@@ -719,9 +721,22 @@ asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
int, const char __user *);
+
+/*
+ * For most but not all architectures, "am I in a compat syscall?" and
+ * "am I a compat task?" are the same question. For architectures on which
+ * they aren't the same question, arch code can override in_compat_syscall.
+ */
+
+#ifndef in_compat_syscall
+static inline bool in_compat_syscall(void) { return is_compat_task(); }
+#endif
+
#else
#define is_compat_task() (0)
+static inline bool in_compat_syscall(void) { return false; }
#endif /* CONFIG_COMPAT */
+
#endif /* _LINUX_COMPAT_H */