Merge branch 'linus' into perf/core

[safe/jmp/linux-2.6] / arch / x86 / kernel / xsave.c

diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 2f98323..782c3a3 100644 (file)
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -89,13 +89,15 @@ int save_i387_xstate(void __user *buf)
 
        if (!used_math())
                return 0;
-       clear_used_math(); /* trigger finit */
+
        if (task_thread_info(tsk)->status & TS_USEDFPU) {
                /*
                 * Start with clearing the user buffer. This will present a
                 * clean context for the bytes not touched by the fxsave/xsave.
                 */
-               __clear_user(buf, sig_xstate_size);
+               err = __clear_user(buf, sig_xstate_size);
+               if (err)
+                       return err;
 
                if (task_thread_info(tsk)->status & TS_XSAVE)
                        err = xsave_user(buf);
@@ -112,6 +114,8 @@ int save_i387_xstate(void __user *buf)
                        return -1;
        }
 
+       clear_used_math(); /* trigger finit */
+
        if (task_thread_info(tsk)->status & TS_XSAVE) {
                struct _fpstate __user *fx = buf;
                struct _xstate __user *x = buf;
@@ -157,7 +161,7 @@ int save_i387_xstate(void __user *buf)
  * Restore the extended state if present. Otherwise, restore the FP/SSE
  * state.
  */
-int restore_user_xstate(void __user *buf)
+static int restore_user_xstate(void __user *buf)
 {
        struct _fpx_sw_bytes fx_sw_user;
        u64 mask;
@@ -246,7 +250,7 @@ clear:
  * This will be saved when ever the FP and extended state context is
  * saved on the user stack during the signal handler delivery to the user.
  */
-void prepare_fx_sw_frame(void)
+static void prepare_fx_sw_frame(void)
 {
        int size_extended = (xstate_size - sizeof(struct i387_fxsave_struct)) +
                             FP_XSTATE_MAGIC2_SIZE;
@@ -308,7 +312,7 @@ static void __init setup_xstate_init(void)
 /*
  * Enable and initialize the xsave feature.
  */
-void __init xsave_cntxt_init(void)
+void __ref xsave_cntxt_init(void)
 {
        unsigned int eax, ebx, ecx, edx;
 
@@ -322,7 +326,7 @@ void __init xsave_cntxt_init(void)
        }
 
        /*
-        * for now OS knows only about FP/SSE
+        * Support only the state known to OS.
         */
        pcntxt_mask = pcntxt_mask & XCNTXT_MASK;
        xsave_init();
@@ -333,6 +337,7 @@ void __init xsave_cntxt_init(void)
        cpuid_count(0xd, 0, &eax, &ebx, &ecx, &edx);
        xstate_size = ebx;
 
+       update_regset_xstate_info(xstate_size, pcntxt_mask);
        prepare_fx_sw_frame();
 
        setup_xstate_init();