Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / arch / m32r / kernel / sys_m32r.c

diff --git a/arch/m32r/kernel/sys_m32r.c b/arch/m32r/kernel/sys_m32r.c
index e0500e1..7f66e34 100644 (file)
--- a/arch/m32r/kernel/sys_m32r.c
+++ b/arch/m32r/kernel/sys_m32r.c
@@ -21,6 +21,7 @@
 #include <linux/mman.h>
 #include <linux/file.h>
 #include <linux/utsname.h>
+#include <linux/vs_cvirt.h>
 
 #include <asm/uaccess.h>
 #include <asm/cachectl.h>
@@ -29,27 +30,7 @@
 
 /*
  * sys_tas() - test-and-set
- * linuxthreads testing version
  */
-#ifndef CONFIG_SMP
-asmlinkage int sys_tas(int *addr)
-{
-       int oldval;
-       unsigned long flags;
-
-       if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
-               return -EFAULT;
-       local_irq_save(flags);
-       oldval = *addr;
-       *addr = 1;
-       local_irq_restore(flags);
-       return oldval;
-}
-#else /* CONFIG_SMP */
-#include <linux/spinlock.h>
-
-static DEFINE_SPINLOCK(tas_lock);
-
 asmlinkage int sys_tas(int *addr)
 {
        int oldval;
@@ -57,14 +38,43 @@ asmlinkage int sys_tas(int *addr)
        if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
                return -EFAULT;
 
-       _raw_spin_lock(&tas_lock);
-       oldval = *addr;
-       *addr = 1;
-       _raw_spin_unlock(&tas_lock);
+       /* atomic operation:
+        *   oldval = *addr; *addr = 1;
+        */
+       __asm__ __volatile__ (
+               DCACHE_CLEAR("%0", "r4", "%1")
+               "       .fillinsn\n"
+               "1:\n"
+               "       lock    %0, @%1     ->  unlock  %2, @%1\n"
+               "2:\n"
+               /* NOTE:
+                *   The m32r processor can accept interrupts only
+                *   at the 32-bit instruction boundary.
+                *   So, in the above code, the "unlock" instruction
+                *   can be executed continuously after the "lock"
+                *   instruction execution without any interruptions.
+                */
+               ".section .fixup,\"ax\"\n"
+               "       .balign 4\n"
+               "3:     ldi     %0, #%3\n"
+               "       seth    r14, #high(2b)\n"
+               "       or3     r14, r14, #low(2b)\n"
+               "       jmp     r14\n"
+               ".previous\n"
+               ".section __ex_table,\"a\"\n"
+               "       .balign 4\n"
+               "       .long 1b,3b\n"
+               ".previous\n"
+               : "=&r" (oldval)
+               : "r" (addr), "r" (1), "i"(-EFAULT)
+               : "r14", "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+                 , "r4"
+#endif /* CONFIG_CHIP_M32700_TS1 */
+       );
 
        return oldval;
 }
-#endif /* CONFIG_SMP */
 
 /*
  * sys_pipe() is the normal C calling standard for creating
@@ -197,7 +207,7 @@ asmlinkage int sys_uname(struct old_utsname * name)
        if (!name)
                return -EFAULT;
        down_read(&uts_sem);
-       err=copy_to_user(name, &system_utsname, sizeof (*name));
+       err=copy_to_user(name, vx_new_utsname(), sizeof (*name));
        up_read(&uts_sem);
        return err?-EFAULT:0;
 }