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authorConor Dooley <conor.dooley@microchip.com>2023-03-24 13:05:39 +0300
committerPalmer Dabbelt <palmer@rivosinc.com>2023-03-29 21:48:39 +0300
commit1ee7fc3f4d0a93831a20d5566f203d5ad6d44de8 (patch)
treeba3bdeadf7deffb6bc14b77051cde2d8de8bbcef /arch
parent1aa866931b8026a0dd636e9ef7b5c5dfb4cc5ce8 (diff)
downloadlinux-1ee7fc3f4d0a93831a20d5566f203d5ad6d44de8.tar.xz
RISC-V: always select RISCV_ALTERNATIVE for non-xip kernels
When moving switch_to's has_fpu() over to using riscv_has_extension_likely() rather than static branches, the FPU code gained a dependency on the alternatives framework. That dependency has now been removed, as riscv_has_extension_ikely() now contains a fallback path, using __riscv_isa_extension_available(), but if CONFIG_RISCV_ALTERNATIVE isn't selected when CONFIG_FPU is, has_fpu() checks will not benefit from the "fast path" that the alternatives framework provides. We want to ensure that alternatives are available whenever riscv_has_extension_[un]likely() is used, rather than silently falling back to the slow path, but rather than rely on selecting RISCV_ALTERNATIVE in the myriad of locations that may use riscv_has_extension_[un]likely(), select it (almost) always instead by adding it to the main RISCV config entry. xip kernels cannot make use of the alternatives framework, so it is not enabled for those configurations, although this is the status quo. All current sites that select RISCV_ALTERNATIVE are converted to dependencies on the option instead. The explicit dependencies on !XIP_KERNEL can be dropped, as RISCV_ALTERNATIVE is not user selectable. Fixes: 702e64550b12 ("riscv: fpu: switch has_fpu() to riscv_has_extension_likely()") Link: https://lore.kernel.org/all/ZBruFRwt3rUVngPu@zx2c4.com/ Reported-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com> Link: https://lore.kernel.org/r/20230324100538.3514663-3-conor.dooley@microchip.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/riscv/Kconfig12
-rw-r--r--arch/riscv/Kconfig.erratas6
2 files changed, 8 insertions, 10 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index c5e42cc37604..2f6976418d0a 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -126,6 +126,7 @@ config RISCV
select OF_IRQ
select PCI_DOMAINS_GENERIC if PCI
select PCI_MSI if PCI
+ select RISCV_ALTERNATIVE if !XIP_KERNEL
select RISCV_INTC
select RISCV_TIMER if RISCV_SBI
select SIFIVE_PLIC
@@ -401,9 +402,8 @@ config RISCV_ISA_C
config RISCV_ISA_SVPBMT
bool "SVPBMT extension support"
depends on 64BIT && MMU
- depends on !XIP_KERNEL
+ depends on RISCV_ALTERNATIVE
default y
- select RISCV_ALTERNATIVE
help
Adds support to dynamically detect the presence of the SVPBMT
ISA-extension (Supervisor-mode: page-based memory types) and
@@ -428,8 +428,8 @@ config TOOLCHAIN_HAS_ZBB
config RISCV_ISA_ZBB
bool "Zbb extension support for bit manipulation instructions"
depends on TOOLCHAIN_HAS_ZBB
- depends on !XIP_KERNEL && MMU
- select RISCV_ALTERNATIVE
+ depends on MMU
+ depends on RISCV_ALTERNATIVE
default y
help
Adds support to dynamically detect the presence of the ZBB
@@ -443,9 +443,9 @@ config RISCV_ISA_ZBB
config RISCV_ISA_ZICBOM
bool "Zicbom extension support for non-coherent DMA operation"
- depends on !XIP_KERNEL && MMU
+ depends on MMU
+ depends on RISCV_ALTERNATIVE
default y
- select RISCV_ALTERNATIVE
select RISCV_DMA_NONCOHERENT
help
Adds support to dynamically detect the presence of the ZICBOM
diff --git a/arch/riscv/Kconfig.erratas b/arch/riscv/Kconfig.erratas
index 69621ae6d647..0c8f4652cd82 100644
--- a/arch/riscv/Kconfig.erratas
+++ b/arch/riscv/Kconfig.erratas
@@ -2,8 +2,7 @@ menu "CPU errata selection"
config ERRATA_SIFIVE
bool "SiFive errata"
- depends on !XIP_KERNEL
- select RISCV_ALTERNATIVE
+ depends on RISCV_ALTERNATIVE
help
All SiFive errata Kconfig depend on this Kconfig. Disabling
this Kconfig will disable all SiFive errata. Please say "Y"
@@ -35,8 +34,7 @@ config ERRATA_SIFIVE_CIP_1200
config ERRATA_THEAD
bool "T-HEAD errata"
- depends on !XIP_KERNEL
- select RISCV_ALTERNATIVE
+ depends on RISCV_ALTERNATIVE
help
All T-HEAD errata Kconfig depend on this Kconfig. Disabling
this Kconfig will disable all T-HEAD errata. Please say "Y"