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m68k: Make sys_atomic_cmpxchg_32 work on classic m68k
[firefly-linux-kernel-4.4.55.git]
/
arch
/
m68k
/
kernel
/
sys_m68k.c
diff --git
a/arch/m68k/kernel/sys_m68k.c
b/arch/m68k/kernel/sys_m68k.c
index 8623f8dc16f8a03c9da88910537ae93fc47bc510..9a5932ec368946bf808c5faf527cbf39731b5540 100644
(file)
--- a/
arch/m68k/kernel/sys_m68k.c
+++ b/
arch/m68k/kernel/sys_m68k.c
@@
-479,9
+479,13
@@
sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
goto bad_access;
}
goto bad_access;
}
- mem_value = *mem;
+ /*
+ * No need to check for EFAULT; we know that the page is
+ * present and writable.
+ */
+ __get_user(mem_value, mem);
if (mem_value == oldval)
if (mem_value == oldval)
-
*mem = newval
;
+
__put_user(newval, mem)
;
pte_unmap_unlock(pte, ptl);
up_read(&mm->mmap_sem);
pte_unmap_unlock(pte, ptl);
up_read(&mm->mmap_sem);