From eb7beb0ea51de526e59a0c3edc76530b28ef10e7 Mon Sep 17 00:00:00 2001
From: Alberto Milone <alberto.milone@canonical.com>
Date: Tue, 14 Jul 2015 12:56:37 +0200
Subject: [PATCH 1/1] Add support for Linux 4.2

Deal with the FPU code renaming
---
 firegl_public.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

--- 15.7/common/lib/modules/fglrx/build_mod/firegl_public.c
+++ 15.7b/common/lib/modules/fglrx/build_mod/firegl_public.c
@@ -191,9 +191,17 @@
 #include <linux/string.h>
 #include <linux/gfp.h>
 #include <linux/swap.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
 #include "asm/i387.h"
+#else
+#include <asm/fpu/api.h>
+#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
 #include <asm/fpu-internal.h>
+#else
+#include <asm/fpu/internal.h>
+#endif
 #endif
 
 #include "firegl_public.h"
@@ -1698,6 +1706,9 @@ void ATI_API_CALL KCL_SetCurrentProcessState(KCL_ENUM_ProcessState state)
 
 #if defined(__i386__) 
 #ifndef __HAVE_ARCH_CMPXCHG
+#ifndef __xg
+#define __xg(x) ((volatile long *)(x))
+#endif
 static inline 
 unsigned long __fgl_cmpxchg(volatile void *ptr, unsigned long old,            
                         unsigned long new, int size)                      
@@ -1734,7 +1745,11 @@ unsigned long ATI_API_CALL kcl__cmpxchg(volatile void *ptr, unsigned long old,
          unsigned long new, int size)
 {
 #ifndef __HAVE_ARCH_CMPXCHG
+#if defined(__i386__)
     return __fgl_cmpxchg(ptr,old,new,size);
+#elif defined(__x86_64__)
+    return cmpxchg((unsigned long*)ptr,old,new);
+#endif
 #else
     /* On kernel version 2.6.34 passing a variable or unsupported size
      * argument to the __cmpxchg macro causes the default-clause of a
@@ -6430,21 +6445,36 @@ static int KCL_fpu_save_init(struct task_struct *tsk)
    struct fpu *fpu = &tsk->thread.fpu;
 
    if(static_cpu_has(X86_FEATURE_XSAVE)) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
       fpu_xsave(fpu);
       if (!(fpu->state->xsave.xsave_hdr.xstate_bv & XSTATE_FP))
+#else
+      copy_xregs_to_kernel(&fpu->state.xsave);
+      if (!(fpu->state.xsave.header.xfeatures & XSTATE_FP))
+#endif
 	 return 1;
    } else if (static_cpu_has(X86_FEATURE_FXSR)) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
 	 fpu_fxsave(fpu);
+#else
+     copy_fxregs_to_kernel(fpu);
+#endif
    } else {
 	 asm volatile("fnsave %[fx]; fwait"
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
                   : [fx] "=m" (fpu->state->fsave));
+#else
+                  : [fx] "=m" (fpu->state.fsave));
+#endif
 	 return 0;
    }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
    if (unlikely(fpu->state->fxsave.swd & X87_FSW_ES)) {
 	asm volatile("fnclex");
 	return 0;
    }
+#endif
    return 1;
 }
 #endif
@@ -6456,8 +6486,12 @@ static int KCL_fpu_save_init(struct task_struct *tsk)
 void ATI_API_CALL KCL_fpu_begin(void)
 {
 #ifdef CONFIG_X86_64
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
     kernel_fpu_begin();
 #else
+    __kernel_fpu_begin();
+#endif
+#else
 #ifdef TS_USEDFPU
     struct thread_info *cur_thread = current_thread_info();
     struct task_struct *cur_task = get_current();
@@ -6502,7 +6536,11 @@ void ATI_API_CALL KCL_fpu_begin(void)
  */
 void ATI_API_CALL KCL_fpu_end(void)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
     kernel_fpu_end();
+#else
+    __kernel_fpu_end();
+#endif
 }
 
 /** Create new directory entry under "/proc/...."