EDAC, sb_edac: Remove variable length array usage

In preparation for enabling -Wvla, remove VLA and replace it with a
fixed-length array instead.

Also, remove max_interleave as it is no longer needed.
Reviewed-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20180314182131.GA25259@embeddedgusSigned-off-by: Borislav Petkov <bp@suse.de>

drivers/edac/sb_edac.c

@@ -110,6 +110,10 @@ static const u32 knl_interleave_list[] = {
 	0xdc, 0xe4, 0xec, 0xf4, 0xfc, /* 15-19 */
 	0x104, 0x10c, 0x114, 0x11c,   /* 20-23 */
 };
+#define MAX_INTERLEAVE							\
+	(max_t(unsigned int, ARRAY_SIZE(sbridge_interleave_list),	\
+	       max_t(unsigned int, ARRAY_SIZE(ibridge_interleave_list),	\
+		     ARRAY_SIZE(knl_interleave_list))))
 
 struct interleave_pkg {
 	unsigned char start;
@@ -321,7 +325,6 @@ struct sbridge_info {
 	const u32	*interleave_list;
 	const struct interleave_pkg *interleave_pkg;
 	u8		max_sad;
-	u8		max_interleave;
 	u8		(*get_node_id)(struct sbridge_pvt *pvt);
 	enum mem_type	(*get_memory_type)(struct sbridge_pvt *pvt);
 	enum dev_type	(*get_width)(struct sbridge_pvt *pvt, u32 mtr);
@@ -1899,7 +1902,7 @@ static int get_memory_error_data(struct mem_ctl_info *mci,
 	int			n_rir, n_sads, n_tads, sad_way, sck_xch;
 	int			sad_interl, idx, base_ch;
 	int			interleave_mode, shiftup = 0;
-	unsigned		sad_interleave[pvt->info.max_interleave];
+	unsigned int		sad_interleave[MAX_INTERLEAVE];
 	u32			reg, dram_rule;
 	u8			ch_way, sck_way, pkg, sad_ha = 0;
 	u32			tad_offset;
@@ -3169,7 +3172,6 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
 		pvt->info.dram_attr = dram_attr;
 		pvt->info.max_sad = ARRAY_SIZE(ibridge_dram_rule);
 		pvt->info.interleave_list = ibridge_interleave_list;
-		pvt->info.max_interleave = ARRAY_SIZE(ibridge_interleave_list);
 		pvt->info.interleave_pkg = ibridge_interleave_pkg;
 		pvt->info.get_width = ibridge_get_width;
 
@@ -3194,7 +3196,6 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
 		pvt->info.dram_attr = dram_attr;
 		pvt->info.max_sad = ARRAY_SIZE(sbridge_dram_rule);
 		pvt->info.interleave_list = sbridge_interleave_list;
-		pvt->info.max_interleave = ARRAY_SIZE(sbridge_interleave_list);
 		pvt->info.interleave_pkg = sbridge_interleave_pkg;
 		pvt->info.get_width = sbridge_get_width;
 
@@ -3219,7 +3220,6 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
 		pvt->info.dram_attr = dram_attr;
 		pvt->info.max_sad = ARRAY_SIZE(ibridge_dram_rule);
 		pvt->info.interleave_list = ibridge_interleave_list;
-		pvt->info.max_interleave = ARRAY_SIZE(ibridge_interleave_list);
 		pvt->info.interleave_pkg = ibridge_interleave_pkg;
 		pvt->info.get_width = ibridge_get_width;
 
@@ -3244,7 +3244,6 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
 		pvt->info.dram_attr = dram_attr;
 		pvt->info.max_sad = ARRAY_SIZE(ibridge_dram_rule);
 		pvt->info.interleave_list = ibridge_interleave_list;
-		pvt->info.max_interleave = ARRAY_SIZE(ibridge_interleave_list);
 		pvt->info.interleave_pkg = ibridge_interleave_pkg;
 		pvt->info.get_width = broadwell_get_width;
 
@@ -3269,7 +3268,6 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
 		pvt->info.dram_attr = dram_attr_knl;
 		pvt->info.max_sad = ARRAY_SIZE(knl_dram_rule);
 		pvt->info.interleave_list = knl_interleave_list;
-		pvt->info.max_interleave = ARRAY_SIZE(knl_interleave_list);
 		pvt->info.interleave_pkg = ibridge_interleave_pkg;
 		pvt->info.get_width = knl_get_width;