Commit 6d1c4261 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Andi Kleen
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[PATCH] i386: Update __copy_to_user_inatomic linuxdoc description 



Explicity specify that the caller should pin the user memory
otherwise the function will sleep

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@gmail.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent c8fdd247

include/asm-i386/uaccess.h

+13 −1
Original line number Diff line number Diff line
@@ -397,7 +397,19 @@ unsigned long __must_check __copy_from_user_ll_nocache(void *to, 
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