[SPARC64]: Need to clobber global reg vars in switch_to().

Otherwise the compiler can't see the things like the
per-cpu area base register are changing.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/asm-sparc64/percpu.h b/include/asm-sparc64/percpu.h
index caf8750792ff16e2cad134a3969f9cafb6455a6b..a1f53a4da405dd7496bee581e88a609a57455756 100644 (file)
--- a/include/asm-sparc64/percpu.h
+++ b/include/asm-sparc64/percpu.h
@@ -3,6 +3,8 @@
 
 #include <linux/compiler.h>
 
+register unsigned long __local_per_cpu_offset asm("g5");
+
 #ifdef CONFIG_SMP
 
 #define setup_per_cpu_areas()                  do { } while (0)
@@ -23,8 +25,6 @@ extern unsigned long __per_cpu_shift;
     __typeof__(type) per_cpu__##name                           \
     ____cacheline_aligned_in_smp
 
-register unsigned long __local_per_cpu_offset asm("g5");
-
 /* var is in discarded region: offset to particular copy we want */
 #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
 #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __local_per_cpu_offset))

diff --git a/include/asm-sparc64/system.h b/include/asm-sparc64/system.h
index 64891cb10f05c572c6ec1e9a86f0eef14271a4b9..3f175fa7e6d2311095a7256a4a7da2a9d7a447cd 100644 (file)
--- a/include/asm-sparc64/system.h
+++ b/include/asm-sparc64/system.h
@@ -141,7 +141,6 @@ do {                                                \
         * not preserve it's value.  Hairy, but it lets us remove 2 loads
         * and 2 stores in this critical code path.  -DaveM
         */
-#define EXTRA_CLOBBER ,"%l1"
 #define switch_to(prev, next, last)                                    \
 do {   if (test_thread_flag(TIF_PERFCTR)) {                            \
                unsigned long __tmp;                                    \
@@ -164,33 +163,34 @@ do {      if (test_thread_flag(TIF_PERFCTR)) {                            \
        "stx    %%i6, [%%sp + 2047 + 0x70]\n\t"                         \
        "stx    %%i7, [%%sp + 2047 + 0x78]\n\t"                         \
        "rdpr   %%wstate, %%o5\n\t"                                     \
-       "stx    %%o6, [%%g6 + %3]\n\t"                                  \
-       "stb    %%o5, [%%g6 + %2]\n\t"                                  \
-       "rdpr   %%cwp, %%o5\n\t"                                        \
+       "stx    %%o6, [%%g6 + %6]\n\t"                                  \
        "stb    %%o5, [%%g6 + %5]\n\t"                                  \
-       "mov    %1, %%g6\n\t"                                           \
-       "ldub   [%1 + %5], %%g1\n\t"                                    \
+       "rdpr   %%cwp, %%o5\n\t"                                        \
+       "stb    %%o5, [%%g6 + %8]\n\t"                                  \
+       "mov    %4, %%g6\n\t"                                           \
+       "ldub   [%4 + %8], %%g1\n\t"                                    \
        "wrpr   %%g1, %%cwp\n\t"                                        \
-       "ldx    [%%g6 + %3], %%o6\n\t"                                  \
-       "ldub   [%%g6 + %2], %%o5\n\t"                                  \
-       "ldub   [%%g6 + %4], %%o7\n\t"                                  \
+       "ldx    [%%g6 + %6], %%o6\n\t"                                  \
+       "ldub   [%%g6 + %5], %%o5\n\t"                                  \
+       "ldub   [%%g6 + %7], %%o7\n\t"                                  \
        "wrpr   %%o5, 0x0, %%wstate\n\t"                                \
        "ldx    [%%sp + 2047 + 0x70], %%i6\n\t"                         \
        "ldx    [%%sp + 2047 + 0x78], %%i7\n\t"                         \
-       "ldx    [%%g6 + %6], %%g4\n\t"                                  \
+       "ldx    [%%g6 + %9], %%g4\n\t"                                  \
        "brz,pt %%o7, 1f\n\t"                                           \
        " mov   %%g7, %0\n\t"                                           \
        "b,a ret_from_syscall\n\t"                                      \
        "1:\n\t"                                                        \
-       : "=&r" (last)                                                  \
+       : "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \
+         "=r" (__local_per_cpu_offset)                                 \
        : "0" (task_thread_info(next)),                                 \
          "i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_NEW_CHILD),            \
          "i" (TI_CWP), "i" (TI_TASK)                                   \
        : "cc",                                                         \
                "g1", "g2", "g3",                   "g7",               \
-                     "l2", "l3", "l4", "l5", "l6", "l7",               \
+               "l1", "l2", "l3", "l4", "l5", "l6", "l7",               \
          "i0", "i1", "i2", "i3", "i4", "i5",                           \
-         "o0", "o1", "o2", "o3", "o4", "o5",       "o7" EXTRA_CLOBBER);\
+         "o0", "o1", "o2", "o3", "o4", "o5",       "o7");              \
        /* If you fuck with this, update ret_from_syscall code too. */  \
        if (test_thread_flag(TIF_PERFCTR)) {                            \
                write_pcr(current_thread_info()->pcr_reg);              \