ARC: Assume multiplier is always present

BugLink: https://bugs.launchpad.net/bugs/1836668

[ Upstream commit 0eca6fdb ]

It is unlikely that designs running Linux will not have multiplier.
Further the current support is not complete as tool don't generate a
multilib w/o multiplier.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/arc/Kconfig

@@ -278,14 +278,6 @@ config ARC_DCCM_BASE
 	default "0xA0000000"
 	depends on ARC_HAS_DCCM
 
-config ARC_HAS_HW_MPY
-	bool "Use Hardware Multiplier (Normal or Faster XMAC)"
-	default y
-	help
-	  Influences how gcc generates code for MPY operations.
-	  If enabled, MPYxx insns are generated, provided by Standard/XMAC
-	  Multipler. Otherwise software multipy lib is used
-
 choice
 	prompt "MMU Version"
 	default ARC_MMU_V3 if ARC_CPU_770

arch/arc/Makefile

@@ -72,10 +72,6 @@ ldflags-$(CONFIG_CPU_BIG_ENDIAN)	+= -EB
 # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
 ldflags-$(upto_gcc44)			+= -marclinux
 
-ifndef CONFIG_ARC_HAS_HW_MPY
-	cflags-y	+= -mno-mpy
-endif
-
 LIBGCC	:= $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
 
 # Modules with short calls might break for calls into builtin-kernel

arch/arc/kernel/setup.c

@@ -232,8 +232,6 @@ static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 
 			n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
 		}
-		n += scnprintf(buf + n, len - n, "%s",
-			       IS_USED_CFG(CONFIG_ARC_HAS_HW_MPY));
 	}
 
 	n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",