From: "Aneesh Kumar K.V" <aneesh.kumar@gmail.com>
Explicity specify that the caller should pin the user memory
otherwise the function will sleep
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@gmail.com>
Signed-off-by: Andi Kleen <ak@suse.de>
---
include/asm-i386/uaccess.h | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
Index: linux/include/asm-i386/uaccess.h
===================================================================
--- linux.orig/include/asm-i386/uaccess.h
+++ linux/include/asm-i386/uaccess.h
@@ -397,7 +397,19 @@ unsigned long __must_check __copy_from_u
unsigned long __must_check __copy_from_user_ll_nocache_nozero(void *to,
const void __user *from, unsigned long n);
-/*
+/**
+ * __copy_to_user_inatomic: - Copy a block of data into user space, with less checking.
+ * @to: Destination address, in user space.
+ * @from: Source address, in kernel space.
+ * @n: Number of bytes to copy.
+ *
+ * Context: User context only.
+ *
+ * Copy data from kernel space to user space. Caller must check
+ * the specified block with access_ok() before calling this function.
+ * The caller should also make sure he pins the user space address
+ * so that the we don't result in page fault and sleep.
+ *
* Here we special-case 1, 2 and 4-byte copy_*_user invocations. On a fault
* we return the initial request size (1, 2 or 4), as copy_*_user should do.
* If a store crosses a page boundary and gets a fault, the x86 will not write
-
