linux-kernel - [PATCH] [29/35] i386: Update __copy_to_user

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Message-Id: <20070428175254.DA5DF151CA@wotan.suse.de>
Date:	Sat, 28 Apr 2007 19:52:54 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...il.com>,
	linux-kernel@...r.kernel.org, patches@...-64.org
Subject: [PATCH] [29/35] i386: Update  __copy_to_user_inatomic linuxdoc description


From: "Aneesh Kumar K.V" <aneesh.kumar@...il.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@...il.com>
Signed-off-by: Andi Kleen <ak@...e.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
-
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