From 16d9591e0961f6a4140d19635990667aaff06b9f Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Sun, 25 Jul 2021 12:44:13 +0200 Subject: [PATCH] m68k: Fix invalid RMW_INSNS on CPUs that lack CAS [ Upstream commit 2189e928b62e91d8efbc9826ae7c0968f0d55790 ] When enabling CONFIG_RMW_INSNS in e.g. a Coldfire build: {standard input}:3068: Error: invalid instruction for this architecture; needs 68020 or higher (68020 [68k, 68ec020], 68030 [68ec030], 68040 [68ec040], 68060 [68ec060]) -- statement `casl %d4,%d0,(%a6)' ignored Fix this by (a) adding a new config symbol to track if support for any CPU that lacks the CAS instruction is enabled, and (b) making CONFIG_RMW_INSNS depend on the new symbol not being set. Fixes: 0e152d80507b75c0 ("m68k: reorganize Kconfig options to improve mmu/non-mmu selections") Reported-by: kernel test robot Reported-by: Arnd Bergmann Signed-off-by: Geert Uytterhoeven Acked-by: Arnd Bergmann Link: https://lore.kernel.org/r/20210725104413.318932-1-geert@linux-m68k.org Signed-off-by: Sasha Levin --- arch/m68k/Kconfig.cpu | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu index 694c4fca9f5d..c17205da47fe 100644 --- a/arch/m68k/Kconfig.cpu +++ b/arch/m68k/Kconfig.cpu @@ -25,6 +25,7 @@ config COLDFIRE bool "Coldfire CPU family support" select ARCH_HAVE_CUSTOM_GPIO_H select CPU_HAS_NO_BITFIELDS + select CPU_HAS_NO_CAS select CPU_HAS_NO_MULDIV64 select GENERIC_CSUM select GPIOLIB @@ -38,6 +39,7 @@ config M68000 bool "MC68000" depends on !MMU select CPU_HAS_NO_BITFIELDS + select CPU_HAS_NO_CAS select CPU_HAS_NO_MULDIV64 select CPU_HAS_NO_UNALIGNED select GENERIC_CSUM @@ -53,6 +55,7 @@ config M68000 config MCPU32 bool select CPU_HAS_NO_BITFIELDS + select CPU_HAS_NO_CAS select CPU_HAS_NO_UNALIGNED select CPU_NO_EFFICIENT_FFS help @@ -357,7 +360,7 @@ config ADVANCED config RMW_INSNS bool "Use read-modify-write instructions" - depends on ADVANCED + depends on ADVANCED && !CPU_HAS_NO_CAS help This allows to use certain instructions that work with indivisible read-modify-write bus cycles. While this is faster than the @@ -411,6 +414,9 @@ config NODES_SHIFT config CPU_HAS_NO_BITFIELDS bool +config CPU_HAS_NO_CAS + bool + config CPU_HAS_NO_MULDIV64 bool