Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq

[linux-2.6] / arch / s390 / lib / uaccess_mvcos.c

diff --git a/arch/s390/lib/uaccess_mvcos.c b/arch/s390/lib/uaccess_mvcos.c
index 86c96d6c191a3819bb094cb7d0698b3401a0c147..121b2935a422a2e724ce97cd9dd49aaa61cc26a7 100644 (file)
--- a/arch/s390/lib/uaccess_mvcos.c
+++ b/arch/s390/lib/uaccess_mvcos.c
@@ -35,7 +35,7 @@ size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
        tmp1 = -4096UL;
        asm volatile(
                "0: .insn ss,0xc80000000000,0(%0,%2),0(%1),0\n"
-               "   jz    4f\n"
+               "   jz    7f\n"
                "1:"ALR"  %0,%3\n"
                "  "SLR"  %1,%3\n"
                "  "SLR"  %2,%3\n"
@@ -44,13 +44,23 @@ size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
                "   nr    %4,%3\n"      /* %4 = (ptr + 4095) & -4096 */
                "  "SLR"  %4,%1\n"
                "  "CLR"  %0,%4\n"      /* copy crosses next page boundary? */
-               "   jnh   5f\n"
+               "   jnh   4f\n"
                "3: .insn ss,0xc80000000000,0(%4,%2),0(%1),0\n"
                "  "SLR"  %0,%4\n"
-               "   j     5f\n"
-               "4:"SLR"  %0,%0\n"
-               "5: \n"
-               EX_TABLE(0b,2b) EX_TABLE(3b,5b)
+               "  "ALR"  %2,%4\n"
+               "4:"LHI"  %4,-1\n"
+               "  "ALR"  %4,%0\n"      /* copy remaining size, subtract 1 */
+               "   bras  %3,6f\n"      /* memset loop */
+               "   xc    0(1,%2),0(%2)\n"
+               "5: xc    0(256,%2),0(%2)\n"
+               "   la    %2,256(%2)\n"
+               "6:"AHI"  %4,-256\n"
+               "   jnm   5b\n"
+               "   ex    %4,0(%3)\n"
+               "   j     8f\n"
+               "7:"SLR"  %0,%0\n"
+               "8: \n"
+               EX_TABLE(0b,2b) EX_TABLE(3b,4b)
                : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
                : "d" (reg0) : "cc", "memory");
        return size;