917c3660d6
Move all applicable EXPORT_SYMBOL()s to the file where the respective symbol is defined. Removed all the includes that are no longer needed in sparc_ksyms_64.c Comment all remaining EXPORT_SYMBOL()s in sparc_ksyms_64.c Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Additions by Julian Calaby: * Moved EXPORT_SYMBOL()s for prom functions to their rightful places. * Made some minor cleanups to the includes and comments of sparc_ksyms_64.c * Updated and tidied commit message. * Rebased patch over sparc-2.6.git HEAD. * Ensured that all modified files have the correct includes. Signed-off-by: Julian Calaby <julian.calaby@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/* user_fixup.c: Fix up user copy faults.
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*
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* Copyright (C) 2004 David S. Miller <davem@redhat.com>
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*/
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#include <linux/compiler.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <asm/uaccess.h>
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/* Calculating the exact fault address when using
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* block loads and stores can be very complicated.
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*
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* Instead of trying to be clever and handling all
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* of the cases, just fix things up simply here.
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*/
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static unsigned long compute_size(unsigned long start, unsigned long size, unsigned long *offset)
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{
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unsigned long fault_addr = current_thread_info()->fault_address;
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unsigned long end = start + size;
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if (fault_addr < start || fault_addr >= end) {
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*offset = 0;
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} else {
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*offset = fault_addr - start;
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size = end - fault_addr;
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}
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return size;
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}
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unsigned long copy_from_user_fixup(void *to, const void __user *from, unsigned long size)
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{
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unsigned long offset;
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size = compute_size((unsigned long) from, size, &offset);
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if (likely(size))
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memset(to + offset, 0, size);
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return size;
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}
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EXPORT_SYMBOL(copy_from_user_fixup);
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unsigned long copy_to_user_fixup(void __user *to, const void *from, unsigned long size)
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{
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unsigned long offset;
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return compute_size((unsigned long) to, size, &offset);
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}
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EXPORT_SYMBOL(copy_to_user_fixup);
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unsigned long copy_in_user_fixup(void __user *to, void __user *from, unsigned long size)
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{
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unsigned long fault_addr = current_thread_info()->fault_address;
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unsigned long start = (unsigned long) to;
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unsigned long end = start + size;
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if (fault_addr >= start && fault_addr < end)
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return end - fault_addr;
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start = (unsigned long) from;
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end = start + size;
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if (fault_addr >= start && fault_addr < end)
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return end - fault_addr;
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return size;
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}
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EXPORT_SYMBOL(copy_in_user_fixup);
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