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-rw-r--r--linux-core/drm_compat.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h
index c7f72e33..e09be479 100644
--- a/linux-core/drm_compat.h
+++ b/linux-core/drm_compat.h
@@ -333,9 +333,24 @@ typedef _Bool bool;
#if (defined(CONFIG_X86) && defined(CONFIG_X86_32) && defined(CONFIG_HIGHMEM))
+/*
+ * pgd_offset_k() is a macro that uses the symbol init_mm,
+ * check that it is available.
+ */
+# if ((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)) || \
+ defined(CONFIG_UNUSED_SYMBOLS))
#define DRM_KMAP_ATOMIC_PROT_PFN
extern void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type,
pgprot_t protection);
+# else
+#warning "init_mm is not available on this kernel!"
+static inline void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type,
+ pgprot_t protection)
+{
+ /* stub */
+ return NULL;
+}
+# endif /* no init_mm */
#endif
#if !defined(flush_agp_mappings)