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s390/mm: Simplify get_fault_type()

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With the gmap code gone get_fault_type() can be simplified:

- every fault with user_mode(regs) == true must be a fault in user address
  space

- every fault with user_mode(regs) == false is only a fault in user
  address space if the used address space is the secondary address space

- every other fault is within the kernel address space

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Link: https://lore.kernel.org/r/20241022120601.167009-10-imbrenda@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2024-10-22 14:05:59 +02:00
parent e8d8d97218
commit f76901d160
1 changed files with 2 additions and 9 deletions
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11
arch/s390/mm/fault.c
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@ -68,17 +68,10 @@ static enum fault_type get_fault_type(struct pt_regs *regs)
{
union teid teid = { .val = regs->int_parm_long };
if (likely(teid.as == PSW_BITS_AS_PRIMARY)) {
if (user_mode(regs))
return USER_FAULT;
return KERNEL_FAULT;
}
if (user_mode(regs))
return USER_FAULT;
if (teid.as == PSW_BITS_AS_SECONDARY)
return USER_FAULT;
/* Access register mode, not used in the kernel */
if (teid.as == PSW_BITS_AS_ACCREG)
return USER_FAULT;
/* Home space -> access via kernel ASCE */
return KERNEL_FAULT;
}