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authorMasami Hiramatsu <mhiramat@kernel.org>2019-05-15 14:38:06 +0900
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-05-25 23:04:42 -0400
commit2d8d8fac3b4eab035dcd0068e1f5a746a697fbb3 (patch)
tree234b6d283e668d1a30772670e3e99af779a699cf /include/linux/uaccess.h
parent0c9f23797925069f9ce267c97e488e293f647c69 (diff)
x86/uaccess: Allow access_ok() in irq context if pagefault_disabled
WARN_ON_IN_IRQ() assumes that the access_ok() and following user memory access can sleep. But this assumption is not always correct; when the pagefault is disabled, following memory access will just returns -EFAULT and never sleep. Add pagefault_disabled() check in WARN_ON_ONCE() so that it can ignore the case we call it with disabling pagefault. For this purpose, this modified pagefault_disabled() as an inline function. Link: http://lkml.kernel.org/r/155789868664.26965.7932665824135793317.stgit@devnote2 Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/uaccess.h')
-rw-r--r--include/linux/uaccess.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 2b70130af585..5a43ef7db492 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -203,7 +203,10 @@ static inline void pagefault_enable(void)
/*
* Is the pagefault handler disabled? If so, user access methods will not sleep.
*/
-#define pagefault_disabled() (current->pagefault_disabled != 0)
+static inline bool pagefault_disabled(void)
+{
+ return current->pagefault_disabled != 0;
+}
/*
* The pagefault handler is in general disabled by pagefault_disable() or