build fix for older kernels

diff --git a/linux-core/i915_buffer.c b/linux-core/i915_buffer.c
index 54aa75a..ba58688 100644 (file)
--- a/linux-core/i915_buffer.c
+++ b/linux-core/i915_buffer.c
@@ -270,10 +270,12 @@ static inline void clflush(volatile void *__p)
 
 static inline void drm_cache_flush_addr(void *virt)
 {
+#ifdef cpu_has_clflush
        int i;
 
        for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
                clflush(virt+i);
+#endif
 }
 
 static inline void drm_cache_flush_page(struct page *p)
@@ -291,6 +293,9 @@ void i915_flush_ttm(struct drm_ttm *ttm)
        DRM_MEMORYBARRIER();
 
 #ifdef CONFIG_X86_32
+#ifndef cpu_has_clflush
+#define cpu_has_clflush 0
+#endif
        /* Hopefully nobody has built an x86-64 processor without clflush */
        if (!cpu_has_clflush) {
                wbinvd();