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| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2021-07-25 12:44:13 +0200 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2021-08-09 13:23:50 +0200 |
| commit | 2189e928b62e91d8efbc9826ae7c0968f0d55790 (patch) | |
| tree | 51d631b85a40f4d9b69d5df1d2982e61bbfd4887 | |
| parent | 07aa6c73e7c670c1917e3b2447e8f1b4c236315e (diff) | |
| download | linux-2189e928b62e91d8efbc9826ae7c0968f0d55790.tar.gz linux-2189e928b62e91d8efbc9826ae7c0968f0d55790.tar.bz2 linux-2189e928b62e91d8efbc9826ae7c0968f0d55790.zip | |
m68k: Fix invalid RMW_INSNS on CPUs that lack CAS
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 <lkp@intel.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210725104413.318932-1-geert@linux-m68k.org
| -rw-r--r-- | arch/m68k/Kconfig.cpu | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu index 29e946394fdb..277d61a09463 100644 --- a/arch/m68k/Kconfig.cpu +++ b/arch/m68k/Kconfig.cpu @@ -26,6 +26,7 @@ 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 @@ -39,6 +40,7 @@ config M68000 bool 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 @@ -54,6 +56,7 @@ 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 @@ -383,7 +386,7 @@ 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 @@ -450,6 +453,9 @@ config M68K_L2_CACHE config CPU_HAS_NO_BITFIELDS bool +config CPU_HAS_NO_CAS + bool + config CPU_HAS_NO_MULDIV64 bool |