Messages in this thread | | | Subject | Re: [PATCH] riscv: Ensure isa-ext static keys are writable | From | Ron Economos <> | Date | Tue, 16 Aug 2022 14:20:30 -0700 |
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On 8/16/22 9:30 AM, Andrew Jones wrote: > riscv_isa_ext_keys[] is an array of static keys used in the unified > ISA extension framework. The keys added to this array may be used > anywhere, including in modules. Ensure the keys remain writable by > placing them in the data section. > > The need to change riscv_isa_ext_keys[]'s section was found when the > kvm module started failing to load. Commit 8eb060e10185 ("arch/riscv: > add Zihintpause support") adds a static branch check for a newly > added isa-ext key to cpu_relax(), which kvm uses. > > Fixes: c360cbec3511 ("riscv: introduce unified static key mechanism for ISA extensions") > Signed-off-by: Andrew Jones <ajones@ventanamicro.com> > --- > arch/riscv/kernel/cpufeature.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c > index 553d755483ed..3b5583db9d80 100644 > --- a/arch/riscv/kernel/cpufeature.c > +++ b/arch/riscv/kernel/cpufeature.c > @@ -28,7 +28,7 @@ unsigned long elf_hwcap __read_mostly; > /* Host ISA bitmap */ > static DECLARE_BITMAP(riscv_isa, RISCV_ISA_EXT_MAX) __read_mostly; > > -__ro_after_init DEFINE_STATIC_KEY_ARRAY_FALSE(riscv_isa_ext_keys, RISCV_ISA_EXT_KEY_MAX); > +DEFINE_STATIC_KEY_ARRAY_FALSE(riscv_isa_ext_keys, RISCV_ISA_EXT_KEY_MAX); > EXPORT_SYMBOL(riscv_isa_ext_keys); > > /**
Works good on HiFive Unmatched.
Tested-by: Ron Economos <re@w6rz.net>
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