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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2009-12-07 12:51:47 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-12-07 12:51:34 +0100
commit6c1e3e79430615d0472dbf9f8fed89c571e66423 (patch)
treeed7b6fde69c9b74cd6be35f82a7a75cc2fc77775 /arch/s390/mm
parent1ab947de293f43812276b60cf9fa21127e7a5bb2 (diff)
downloadlinux-linaro-android-6c1e3e79430615d0472dbf9f8fed89c571e66423.tar.gz
[S390] Use do_exception() in pagetable walk usercopy functions.
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>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/fault.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 5a9e9a77dc1..fc102e70d9c 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -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.