unicore32 fix: remove arch-specific futex support

The futex functions in unicore32 are not used and verified,
so just replaced by asm-generic version.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/unicore32/Makefile b/arch/unicore32/Makefile
index e08d6d3..76a8bee 100644 (file)
--- a/arch/unicore32/Makefile
+++ b/arch/unicore32/Makefile
@@ -48,7 +48,7 @@ ASM_GENERIC_HEADERS   += bitsperlong.h bug.h bugs.h
 ASM_GENERIC_HEADERS    += cputime.h current.h
 ASM_GENERIC_HEADERS    += device.h div64.h
 ASM_GENERIC_HEADERS    += emergency-restart.h errno.h
-ASM_GENERIC_HEADERS    += fb.h fcntl.h ftrace.h
+ASM_GENERIC_HEADERS    += fb.h fcntl.h ftrace.h futex.h
 ASM_GENERIC_HEADERS    += hardirq.h hw_irq.h
 ASM_GENERIC_HEADERS    += ioctl.h ioctls.h ipcbuf.h irq_regs.h
 ASM_GENERIC_HEADERS    += kdebug.h kmap_types.h

diff --git a/arch/unicore32/include/asm/futex.h b/arch/unicore32/include/asm/futex.h
deleted file mode 100644 (file)
index 07dea61..0000000
--- a/arch/unicore32/include/asm/futex.h
+++ /dev/null
@@ -1,143 +0,0 @@
-/*
- * linux/arch/unicore32/include/asm/futex.h
- *
- * Code specific to PKUnity SoC and UniCore ISA
- *
- * Copyright (C) 2001-2010 GUAN Xue-tao
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#ifndef __UNICORE_FUTEX_H__
-#define __UNICORE_FUTEX_H__
-
-#ifdef __KERNEL__
-
-#include <linux/futex.h>
-#include <linux/preempt.h>
-#include <linux/uaccess.h>
-#include <linux/errno.h>
-
-#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg)     \
-       __asm__ __volatile__(                                   \
-       "1:     ldw.u   %1, [%2]\n"                             \
-       "       " insn "\n"                                     \
-       "2:     stw.u   %0, [%2]\n"                             \
-       "       mov     %0, #0\n"                               \
-       "3:\n"                                                  \
-       "       .pushsection __ex_table,\"a\"\n"                \
-       "       .align  3\n"                                    \
-       "       .long   1b, 4f, 2b, 4f\n"                       \
-       "       .popsection\n"                                  \
-       "       .pushsection .fixup,\"ax\"\n"                   \
-       "4:     mov     %0, %4\n"                               \
-       "       b       3b\n"                                   \
-       "       .popsection"                                    \
-       : "=&r" (ret), "=&r" (oldval)                           \
-       : "r" (uaddr), "r" (oparg), "Ir" (-EFAULT)              \
-       : "cc", "memory")
-
-static inline int
-futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
-{
-       int op = (encoded_op >> 28) & 7;
-       int cmp = (encoded_op >> 24) & 15;
-       int oparg = (encoded_op << 8) >> 20;
-       int cmparg = (encoded_op << 20) >> 20;
-       int oldval = 0, ret;
-
-       if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
-               oparg = 1 << oparg;
-
-       if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
-               return -EFAULT;
-
-       pagefault_disable();    /* implies preempt_disable() */
-
-       switch (op) {
-       case FUTEX_OP_SET:
-               __futex_atomic_op("mov  %0, %3", ret, oldval, uaddr, oparg);
-               break;
-       case FUTEX_OP_ADD:
-               __futex_atomic_op("add  %0, %1, %3", ret, oldval, uaddr, oparg);
-               break;
-       case FUTEX_OP_OR:
-               __futex_atomic_op("or   %0, %1, %3", ret, oldval, uaddr, oparg);
-               break;
-       case FUTEX_OP_ANDN:
-               __futex_atomic_op("and  %0, %1, %3",
-                               ret, oldval, uaddr, ~oparg);
-               break;
-       case FUTEX_OP_XOR:
-               __futex_atomic_op("xor  %0, %1, %3", ret, oldval, uaddr, oparg);
-               break;
-       default:
-               ret = -ENOSYS;
-       }
-
-       pagefault_enable();     /* subsumes preempt_enable() */
-
-       if (!ret) {
-               switch (cmp) {
-               case FUTEX_OP_CMP_EQ:
-                       ret = (oldval == cmparg);
-                       break;
-               case FUTEX_OP_CMP_NE:
-                       ret = (oldval != cmparg);
-                       break;
-               case FUTEX_OP_CMP_LT:
-                       ret = (oldval <  cmparg);
-                       break;
-               case FUTEX_OP_CMP_GE:
-                       ret = (oldval >= cmparg);
-                       break;
-               case FUTEX_OP_CMP_LE:
-                       ret = (oldval <= cmparg);
-                       break;
-               case FUTEX_OP_CMP_GT:
-                       ret = (oldval >  cmparg);
-                       break;
-               default:
-                       ret = -ENOSYS;
-               }
-       }
-       return ret;
-}
-
-static inline int
-futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
-{
-       int val;
-
-       if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
-               return -EFAULT;
-
-       pagefault_disable();    /* implies preempt_disable() */
-
-       __asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n"
-       "1:     ldw.u   %0, [%3]\n"
-       "       cmpxor.a        %0, %1\n"
-       "       bne     3f\n"
-       "2:     stw.u   %2, [%3]\n"
-       "3:\n"
-       "       .pushsection __ex_table,\"a\"\n"
-       "       .align  3\n"
-       "       .long   1b, 4f, 2b, 4f\n"
-       "       .popsection\n"
-       "       .pushsection .fixup,\"ax\"\n"
-       "4:     mov     %0, %4\n"
-       "       b       3b\n"
-       "       .popsection"
-       : "=&r" (val)
-       : "r" (oldval), "r" (newval), "r" (uaddr), "Ir" (-EFAULT)
-       : "cc", "memory");
-
-       pagefault_enable();     /* subsumes preempt_enable() */
-
-       return val;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __UNICORE_FUTEX_H__ */