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s390: switch to extable.h

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2016-12-26 00:48:37 -05:00
parent d597580d37
commit e70f1d59be
2 changed files with 29 additions and 25 deletions
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28
arch/s390/include/asm/extable.h Normal file
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@@ -0,0 +1,28 @@
#ifndef __S390_EXTABLE_H
#define __S390_EXTABLE_H
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry
{
int insn, fixup;
};
static inline unsigned long extable_fixup(const struct exception_table_entry *x)
{
return (unsigned long)&x->fixup + x->fixup;
}
#define ARCH_HAS_RELATIVE_EXTABLE
#endif

26
arch/s390/include/asm/uaccess.h
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@@ -14,6 +14,7 @@
*/ */
#include <asm/processor.h> #include <asm/processor.h>
#include <asm/ctl_reg.h> #include <asm/ctl_reg.h>
#include <asm/extable.h>
/* /*
@@ -59,31 +60,6 @@ static inline int __range_ok(unsigned long addr, unsigned long size)
#define access_ok(type, addr, size) __access_ok(addr, size) #define access_ok(type, addr, size) __access_ok(addr, size)
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry
{
int insn, fixup;
};
static inline unsigned long extable_fixup(const struct exception_table_entry *x)
{
return (unsigned long)&x->fixup + x->fixup;
}
#define ARCH_HAS_RELATIVE_EXTABLE
/** /**
* __copy_from_user: - Copy a block of data from user space, with less checking. * __copy_from_user: - Copy a block of data from user space, with less checking.
* @to: Destination address, in kernel space. * @to: Destination address, in kernel space.