Merge remote-tracking branch 'drm-panel/drm/panel/for-next'

[karo-tx-linux.git] / arch / arm / kernel / traps.c

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 969f9d9e665f4d49b2951ed65cfde9c279e1aa55..bc698383e82253a47427885359e07e22daa24179 100644 (file)
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -625,58 +625,6 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
                set_tls(regs->ARM_r0);
                return 0;
 
-#ifdef CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG
-       /*
-        * Atomically store r1 in *r2 if *r2 is equal to r0 for user space.
-        * Return zero in r0 if *MEM was changed or non-zero if no exchange
-        * happened.  Also set the user C flag accordingly.
-        * If access permissions have to be fixed up then non-zero is
-        * returned and the operation has to be re-attempted.
-        *
-        * *NOTE*: This is a ghost syscall private to the kernel.  Only the
-        * __kuser_cmpxchg code in entry-armv.S should be aware of its
-        * existence.  Don't ever use this from user code.
-        */
-       case NR(cmpxchg):
-       for (;;) {
-               extern void do_DataAbort(unsigned long addr, unsigned int fsr,
-                                        struct pt_regs *regs);
-               unsigned long val;
-               unsigned long addr = regs->ARM_r2;
-               struct mm_struct *mm = current->mm;
-               pgd_t *pgd; pmd_t *pmd; pte_t *pte;
-               spinlock_t *ptl;
-
-               regs->ARM_cpsr &= ~PSR_C_BIT;
-               down_read(&mm->mmap_sem);
-               pgd = pgd_offset(mm, addr);
-               if (!pgd_present(*pgd))
-                       goto bad_access;
-               pmd = pmd_offset(pgd, addr);
-               if (!pmd_present(*pmd))
-                       goto bad_access;
-               pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
-               if (!pte_present(*pte) || !pte_write(*pte) || !pte_dirty(*pte)) {
-                       pte_unmap_unlock(pte, ptl);
-                       goto bad_access;
-               }
-               val = *(unsigned long *)addr;
-               val -= regs->ARM_r0;
-               if (val == 0) {
-                       *(unsigned long *)addr = regs->ARM_r1;
-                       regs->ARM_cpsr |= PSR_C_BIT;
-               }
-               pte_unmap_unlock(pte, ptl);
-               up_read(&mm->mmap_sem);
-               return val;
-
-               bad_access:
-               up_read(&mm->mmap_sem);
-               /* simulate a write access fault */
-               do_DataAbort(addr, 15 + (1 << 11), regs);
-       }
-#endif
-
        default:
                /* Calls 9f00xx..9f07ff are defined to return -ENOSYS
                   if not implemented, rather than raising SIGILL.  This