ARC: boot log: eliminate struct cpuinfo_arc #4: boot log per ISA

 - boot log now clearly per ISA
 - global struct cpuinfo_arc[] elimiated
 - local struct struct arcinfo kept for passing info
   between functions
Tested-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308162101.Ve5jBg80-lkp@intel.comSigned-off-by: Vineet Gupta <vgupta@kernel.org>

arch/arc/include/asm/arcregs.h

@@ -23,7 +23,7 @@
 #define ARC_REG_ICCM_BUILD	0x78	/* ICCM size (common) */
 #define ARC_REG_XY_MEM_BCR	0x79
 #define ARC_REG_MAC_BCR		0x7a
-#define ARC_REG_MUL_BCR		0x7b
+#define ARC_REG_MPY_BCR		0x7b
 #define ARC_REG_SWAP_BCR	0x7c
 #define ARC_REG_NORM_BCR	0x7d
 #define ARC_REG_MIXMAX_BCR	0x7e
@@ -177,7 +177,7 @@ struct bcr_isa_arcv2 {
 #endif
 };
 
-struct bcr_uarch_build_arcv2 {
+struct bcr_uarch_build {
 #ifdef CONFIG_CPU_BIG_ENDIAN
 	unsigned int pad:8, prod:8, maj:8, min:8;
 #else
@@ -355,35 +355,6 @@ struct bcr_generic {
 #endif
 };
 
-/*
- *******************************************************************
- * Generic structures to hold build configuration used at runtime
- */
-
-struct cpuinfo_arc_bpu {
-	unsigned int ver, full, num_cache, num_pred, ret_stk;
-};
-
-struct cpuinfo_arc_ccm {
-	unsigned int base_addr, sz;
-};
-
-struct cpuinfo_arc {
-	struct cpuinfo_arc_bpu bpu;
-	struct bcr_identity core;
-	struct bcr_isa_arcv2 isa;
-	const char *release, *name;
-	unsigned int vec_base;
-	struct cpuinfo_arc_ccm iccm, dccm;
-	struct {
-		unsigned int swap:1, norm:1, minmax:1, barrel:1, crc:1, swape:1, pad1:2,
-			     fpu_sp:1, fpu_dp:1, dual:1, dual_enb:1, pad2:4,
-			     ap_num:4, ap_full:1, smart:1, rtt:1, pad3:1,
-			     timer0:1, timer1:1, rtc:1, gfrc:1, pad4:4;
-	} extn;
-	struct bcr_mpy extn_mpy;
-};
-
 static inline int is_isa_arcv2(void)
 {
 	return IS_ENABLED(CONFIG_ISA_ARCV2);

arch/arc/include/asm/setup.h

@@ -35,10 +35,10 @@ long __init arc_get_mem_sz(void);
 #define IS_AVAIL3(v, v2, s)	IS_AVAIL1(v, s), IS_AVAIL1(v, IS_DISABLED_RUN(v2))
 
 extern void arc_mmu_init(void);
-extern char *arc_mmu_mumbojumbo(int cpu_id, char *buf, int len);
+extern int arc_mmu_mumbojumbo(int cpu_id, char *buf, int len);
 
 extern void arc_cache_init(void);
-extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
+extern int arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
 
 extern void __init handle_uboot_args(void);
 

arch/arc/mm/cache.c

@@ -39,7 +39,7 @@ void (*__dma_cache_wback_inv)(phys_addr_t start, unsigned long sz);
 void (*__dma_cache_inv)(phys_addr_t start, unsigned long sz);
 void (*__dma_cache_wback)(phys_addr_t start, unsigned long sz);
 
-static char *read_decode_cache_bcr_arcv2(int c, char *buf, int len)
+static int read_decode_cache_bcr_arcv2(int c, char *buf, int len)
 {
 	struct cpuinfo_arc_cache *p_slc = &slc_info;
 	struct bcr_identity ident;
@@ -94,10 +94,10 @@ static char *read_decode_cache_bcr_arcv2(int c, char *buf, int len)
 		       perip_base,
 		       IS_AVAIL3(ioc_exists, ioc_enable, ", IO-Coherency (per-device) "));
 
-	return buf;
+	return n;
 }
 
-char *arc_cache_mumbojumbo(int c, char *buf, int len)
+int arc_cache_mumbojumbo(int c, char *buf, int len)
 {
 	struct cpuinfo_arc_cache *p_ic = &ic_info, *p_dc = &dc_info;
 	struct bcr_cache ibcr, dbcr;
@@ -153,9 +153,9 @@ char *arc_cache_mumbojumbo(int c, char *buf, int len)
 
 slc_chk:
 	if (is_isa_arcv2())
-		read_decode_cache_bcr_arcv2(c, buf + n, len - n);
+		n += read_decode_cache_bcr_arcv2(c, buf + n, len - n);
 
-	return buf;
+	return n;
 }
 
 /*

arch/arc/mm/tlb.c

@@ -562,7 +562,7 @@ void local_flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,
  * the cpuinfo structure for later use.
  * No Validation is done here, simply read/convert the BCRs
  */
-char *arc_mmu_mumbojumbo(int c, char *buf, int len)
+int arc_mmu_mumbojumbo(int c, char *buf, int len)
 {
 	struct cpuinfo_arc_mmu *mmu = &mmuinfo;
 	unsigned int bcr, u_dtlb, u_itlb, sasid;
@@ -607,7 +607,7 @@ char *arc_mmu_mumbojumbo(int c, char *buf, int len)
 		       IS_AVAIL1(sasid, ", SASID"),
 		       IS_AVAIL2(mmu->pae, ", PAE40 ", CONFIG_ARC_HAS_PAE40));
 
-	return buf;
+	return n;
 }
 
 int pae40_exist_but_not_enab(void)