diff --git a/libavcodec/arm/dsputil_iwmmxt.c b/libavcodec/arm/dsputil_iwmmxt.c
index 6a23732e3334932dc221e9201d138c57cb0b2dee..a23ccfc58ff7b4c888ec3f0e91277b46d0ed33a3 100644
--- a/libavcodec/arm/dsputil_iwmmxt.c
+++ b/libavcodec/arm/dsputil_iwmmxt.c
@@ -150,10 +150,11 @@ static void nop(uint8_t *block, const uint8_t *pixels, int line_size, int h)
 /* A run time test is not simple. If this file is compiled in
  * then we should install the functions
  */
-int mm_flags = FF_MM_IWMMXT; /* multimedia extension flags */
 
 void ff_dsputil_init_iwmmxt(DSPContext* c, AVCodecContext *avctx)
 {
+    int mm_flags = FF_MM_IWMMXT; /* multimedia extension flags */
+
     if (avctx->dsp_mask) {
         if (avctx->dsp_mask & FF_MM_FORCE)
             mm_flags |= (avctx->dsp_mask & 0xffff);
diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
index 9ef0270ade88eb06795a3af14ae686702c2e09c7..31eeb7bb10682fec735d333997c52d40d8d688a7 100644
--- a/libavcodec/dsputil.h
+++ b/libavcodec/dsputil.h
@@ -618,7 +618,6 @@ static inline int get_penalty_factor(int lambda, int lambda2, int type){
 /* should be defined by architectures supporting
    one or more MultiMedia extension */
 int mm_support(void);
-extern int mm_flags;
 
 void dsputil_init_alpha(DSPContext* c, AVCodecContext *avctx);
 void dsputil_init_arm(DSPContext* c, AVCodecContext *avctx);
@@ -647,12 +646,7 @@ static inline void emms(void)
     __asm__ volatile ("emms;":::"memory");
 }
 
-
-#define emms_c() \
-{\
-    if (mm_flags & FF_MM_MMX)\
-        emms();\
-}
+#define emms_c() emms()
 
 #elif ARCH_ARM
 
@@ -670,7 +664,6 @@ static inline void emms(void)
 
 #else
 
-#define mm_flags 0
 #define mm_support() 0
 
 #endif
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index d9d6f7e5d673c4e6125b7d2d2dc77c0ffadb96bb..9091042abb7b59015511a50b3fbc963312b3dfe2 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -553,7 +553,7 @@ retry:
 #endif
 
 #if HAVE_MMX
-    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
+    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (mm_support() & FF_MM_MMX)){
         avctx->idct_algo= FF_IDCT_XVIDMMX;
         avctx->coded_width= 0; // force reinit
 //        dsputil_init(&s->dsp, avctx);
diff --git a/libavcodec/ppc/dsputil_ppc.c b/libavcodec/ppc/dsputil_ppc.c
index 229ca0996001bca70a55b4f0dd58ccefbdb7c069..4f1c501c77bf8216ebb0215208fcefef669ba009 100644
--- a/libavcodec/ppc/dsputil_ppc.c
+++ b/libavcodec/ppc/dsputil_ppc.c
@@ -23,8 +23,6 @@
 #include "libavcodec/dsputil.h"
 #include "dsputil_altivec.h"
 
-int mm_flags = 0;
-
 int mm_support(void)
 {
     int result = 0;
@@ -182,8 +180,6 @@ void dsputil_init_ppc(DSPContext* c, AVCodecContext *avctx)
     if(CONFIG_H264_DECODER) dsputil_h264_init_ppc(c, avctx);
 
     if (has_altivec()) {
-        mm_flags |= FF_MM_ALTIVEC;
-
         dsputil_init_altivec(c, avctx);
         if(CONFIG_VC1_DECODER)
             vc1dsp_init_altivec(c, avctx);
diff --git a/libavcodec/ppc/mpegvideo_altivec.c b/libavcodec/ppc/mpegvideo_altivec.c
index 0126b7f42edf5a3994cb1c338563fbe1cf6bb28f..19d897fe66c1b7a62efaeb8d508b34c30d4004fd 100644
--- a/libavcodec/ppc/mpegvideo_altivec.c
+++ b/libavcodec/ppc/mpegvideo_altivec.c
@@ -570,7 +570,7 @@ static void dct_unquantize_h263_altivec(MpegEncContext *s,
 
 void MPV_common_init_altivec(MpegEncContext *s)
 {
-    if ((mm_flags & FF_MM_ALTIVEC) == 0) return;
+    if (!has_altivec()) return;
 
     if (s->avctx->lowres==0) {
         if ((s->avctx->idct_algo == FF_IDCT_AUTO) ||
diff --git a/libavcodec/x86/dnxhd_mmx.c b/libavcodec/x86/dnxhd_mmx.c
index 59bcb3929bf992e6afeeb80b1cdbd283bd70d7b6..1e6299bcd11d426cc51a2e837215eeb325c675d8 100644
--- a/libavcodec/x86/dnxhd_mmx.c
+++ b/libavcodec/x86/dnxhd_mmx.c
@@ -52,7 +52,7 @@ static void get_pixels_8x4_sym_sse2(DCTELEM *block, const uint8_t *pixels, int l
 
 void ff_dnxhd_init_mmx(DNXHDEncContext *ctx)
 {
-    if (mm_flags & FF_MM_SSE2) {
+    if (mm_support() & FF_MM_SSE2) {
         ctx->get_pixels_8x4_sym = get_pixels_8x4_sym_sse2;
     }
 }
diff --git a/libavcodec/x86/dsputil_mmx.c b/libavcodec/x86/dsputil_mmx.c
index 2b96be3a33e7b2fb462cf62c2cf154ccb70e2424..1163e438172e7b470ffa2e43060b475ff836ef61 100644
--- a/libavcodec/x86/dsputil_mmx.c
+++ b/libavcodec/x86/dsputil_mmx.c
@@ -37,8 +37,6 @@
 //#undef NDEBUG
 //#include <assert.h>
 
-int mm_flags; /* multimedia extension flags */
-
 /* pixel operations */
 DECLARE_ALIGNED(8,  const uint64_t, ff_bone) = 0x0101010101010101ULL;
 DECLARE_ALIGNED(8,  const uint64_t, ff_wtwo) = 0x0002000200020002ULL;
@@ -2504,7 +2502,7 @@ float ff_scalarproduct_float_sse(const float *v1, const float *v2, int order);
 
 void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx)
 {
-    mm_flags = mm_support();
+    int mm_flags = mm_support();
 
     if (avctx->dsp_mask) {
         if (avctx->dsp_mask & FF_MM_FORCE)
@@ -2941,7 +2939,7 @@ void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx)
 #if CONFIG_H264DSP
 void ff_h264dsp_init_x86(H264DSPContext *c)
 {
-    mm_flags = mm_support();
+    int mm_flags = mm_support();
 
     if (mm_flags & FF_MM_MMX) {
         c->h264_idct_dc_add=
diff --git a/libavcodec/x86/dsputilenc_mmx.c b/libavcodec/x86/dsputilenc_mmx.c
index d3e412a3dcee340dec2c26efe8656c211625cdd0..bc24abadc72876856ab6c2372414e2c6974ef562 100644
--- a/libavcodec/x86/dsputilenc_mmx.c
+++ b/libavcodec/x86/dsputilenc_mmx.c
@@ -1350,6 +1350,8 @@ static int ssd_int8_vs_int16_mmx(const int8_t *pix1, const int16_t *pix2, int si
 
 void dsputilenc_init_mmx(DSPContext* c, AVCodecContext *avctx)
 {
+    int mm_flags = mm_support();
+
     if (mm_flags & FF_MM_MMX) {
         const int dct_algo = avctx->dct_algo;
         if(dct_algo==FF_DCT_AUTO || dct_algo==FF_DCT_MMX){
diff --git a/libavcodec/x86/h264dsp_mmx.c b/libavcodec/x86/h264dsp_mmx.c
index ebd87518baf73812dd6c74497ac7e12a8a554773..e402e420f8362ded6c14f03bbc1ccd5979581239 100644
--- a/libavcodec/x86/h264dsp_mmx.c
+++ b/libavcodec/x86/h264dsp_mmx.c
@@ -2368,7 +2368,7 @@ void ff_pred4x4_vertical_vp8_mmxext(uint8_t *src, const uint8_t *topright, int s
 #if CONFIG_H264PRED
 void ff_h264_pred_init_x86(H264PredContext *h, int codec_id)
 {
-    mm_flags = mm_support();
+    int mm_flags = mm_support();
 
 #if HAVE_YASM
     if (mm_flags & FF_MM_MMX) {
diff --git a/libavcodec/x86/motion_est_mmx.c b/libavcodec/x86/motion_est_mmx.c
index 0272410dc56f757c3444c508c1ccf4936eefd37a..87e7a15a471a2fbd208bc89e62ae58e18c941861 100644
--- a/libavcodec/x86/motion_est_mmx.c
+++ b/libavcodec/x86/motion_est_mmx.c
@@ -427,6 +427,8 @@ PIX_SAD(mmx2)
 
 void dsputil_init_pix_mmx(DSPContext* c, AVCodecContext *avctx)
 {
+    int mm_flags = mm_support();
+
     if (mm_flags & FF_MM_MMX) {
         c->pix_abs[0][0] = sad16_mmx;
         c->pix_abs[0][1] = sad16_x2_mmx;
diff --git a/libavcodec/x86/mpegaudiodec_mmx.c b/libavcodec/x86/mpegaudiodec_mmx.c
index e7e1150789fd5ca4cbb467dc9b56438f55d81f00..f4c9b45986be7661e9698c3f843d95571300d25d 100644
--- a/libavcodec/x86/mpegaudiodec_mmx.c
+++ b/libavcodec/x86/mpegaudiodec_mmx.c
@@ -149,7 +149,7 @@ static void apply_window_mp3(float *in, float *win, int *unused, float *out,
 
 void ff_mpegaudiodec_init_mmx(MPADecodeContext *s)
 {
-    mm_flags = mm_support();
+    int mm_flags = mm_support();
 
     if (mm_flags & FF_MM_SSE2) {
         s->apply_window_mp3 = apply_window_mp3;
diff --git a/libavcodec/x86/mpegvideo_mmx.c b/libavcodec/x86/mpegvideo_mmx.c
index 5deb68d28d911b5eff38a34f5348a9057a88985b..3556e1caa77da0644de414e8264d9c3af6b9ad63 100644
--- a/libavcodec/x86/mpegvideo_mmx.c
+++ b/libavcodec/x86/mpegvideo_mmx.c
@@ -625,6 +625,8 @@ static void  denoise_dct_sse2(MpegEncContext *s, DCTELEM *block){
 
 void MPV_common_init_mmx(MpegEncContext *s)
 {
+    int mm_flags = mm_support();
+
     if (mm_flags & FF_MM_MMX) {
         const int dct_algo = s->avctx->dct_algo;
 
diff --git a/libavcodec/x86/snowdsp_mmx.c b/libavcodec/x86/snowdsp_mmx.c
index 263f0bbf699b8ca3264295e131e16017169bca1e..96b3bf29ba21ce1d9e3e15e0a367d60fe03fae9d 100644
--- a/libavcodec/x86/snowdsp_mmx.c
+++ b/libavcodec/x86/snowdsp_mmx.c
@@ -874,7 +874,7 @@ static void ff_snow_inner_add_yblock_mmx(const uint8_t *obmc, const int obmc_str
 
 void ff_dwt_init_x86(DWTContext *c)
 {
-    mm_flags = mm_support();
+    int mm_flags = mm_support();
 
     if (mm_flags & FF_MM_MMX) {
         if(mm_flags & FF_MM_SSE2 & 0){
diff --git a/libavcodec/x86/vc1dsp_mmx.c b/libavcodec/x86/vc1dsp_mmx.c
index 3ce097894d014ca1851b507b860938468008e946..eb3ad2c32fa3f5cff6a3fcbf1cf82ca59c6dc582 100644
--- a/libavcodec/x86/vc1dsp_mmx.c
+++ b/libavcodec/x86/vc1dsp_mmx.c
@@ -714,7 +714,7 @@ static void vc1_h_loop_filter16_sse4(uint8_t *src, int stride, int pq)
 #endif
 
 void ff_vc1dsp_init_mmx(DSPContext* dsp, AVCodecContext *avctx) {
-    mm_flags = mm_support();
+    int mm_flags = mm_support();
 
     dsp->put_vc1_mspel_pixels_tab[ 0] = ff_put_vc1_mspel_mc00_mmx;
     dsp->put_vc1_mspel_pixels_tab[ 4] = put_vc1_mspel_mc01_mmx;
diff --git a/libavcodec/x86/vp8dsp-init.c b/libavcodec/x86/vp8dsp-init.c
index aceec6a346431f8b3d14993af8f3b8c4ccd250c0..ed5cf460248da504c3a7671cb4cf776a98bb6c04 100644
--- a/libavcodec/x86/vp8dsp-init.c
+++ b/libavcodec/x86/vp8dsp-init.c
@@ -282,7 +282,7 @@ DECLARE_LOOP_FILTER(sse4)
 
 av_cold void ff_vp8dsp_init_x86(VP8DSPContext* c)
 {
-    mm_flags = mm_support();
+    int mm_flags = mm_support();
 
 #if HAVE_YASM
     if (mm_flags & FF_MM_MMX) {