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[S390] Use do_exception() in pagetable walk usercopy functions.

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The pagetable walk usercopy functions have used a modified copy of the
do_exception() function for fault handling. This lead to inconsistencies
with recent changes to do_exception(), e.g. performance counters. This
patch changes the pagetable walk usercopy code to call do_exception()
directly, eliminating the redundancy. A new parameter is added to
do_exception() to specify the fault address.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer
2009-12-07 12:51:47 +01:00
committed by Martin Schwidefsky
parent 1ab947de29
commit 6c1e3e7943
3 changed files with 76 additions and 96 deletions
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23
arch/s390/mm/fault.c
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@@ -442,6 +442,29 @@ no_context:
}
#endif
int __handle_fault(unsigned long uaddr, unsigned long int_code, int write_user)
{
struct pt_regs regs;
int access, fault;
regs.psw.mask = psw_kernel_bits;
if (!irqs_disabled())
regs.psw.mask |= PSW_MASK_IO | PSW_MASK_EXT;
regs.psw.addr = (unsigned long) __builtin_return_address(0);
regs.psw.addr |= PSW_ADDR_AMODE;
uaddr &= PAGE_MASK;
access = write_user ? VM_WRITE : VM_READ;
fault = do_exception(&regs, access, uaddr | 2);
if (unlikely(fault)) {
if (fault & VM_FAULT_OOM) {
pagefault_out_of_memory();
fault = 0;
} else if (fault & VM_FAULT_SIGBUS)
do_sigbus(&regs, int_code, uaddr);
}
return fault ? -EFAULT : 0;
}
#ifdef CONFIG_PFAULT
/*
* 'pfault' pseudo page faults routines.