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[PATCH] i386: Update __copy_to_user_inatomic linuxdoc description

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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>
This commit is contained in:
Aneesh Kumar K.V 2007-05-02 19:27:06 +02:00 committed by Andi Kleen
parent c8fdd24725
commit 6d1c426158
1 changed files with 13 additions and 1 deletions
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14
include/asm-i386/uaccess.h
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@ -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, unsigned long __must_check __copy_from_user_ll_nocache_nozero(void *to,
const void __user *from, unsigned long n); 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 * 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. * 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 * If a store crosses a page boundary and gets a fault, the x86 will not write