2023-01-11 17:22:55

by Jisheng Zhang

[permalink] [raw]

Subject: [PATCH v3 03/13] riscv: cpufeature: detect RISCV_ALTERNATIVES_EARLY_BOOT earlier

---

Currently riscv_cpufeature_patch_func() does nothing at the
RISCV_ALTERNATIVES_EARLY_BOOT stage. Add a check to detect whether we
are in this stage and exit early. This will allow us to use
riscv_cpufeature_patch_func() for scanning of all ISA extensions.

Signed-off-by: Jisheng Zhang <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
---
arch/riscv/kernel/cpufeature.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 421b3d9578cc..37e8c5e69754 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -328,6 +328,9 @@ void __init_or_module riscv_cpufeature_patch_func(struct alt_entry *begin,
struct alt_entry *alt;
u32 tmp;

+ if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
+ return;
+
for (alt = begin; alt < end; alt++) {
if (alt->vendor_id != 0)
continue;
--
2.38.1

2023-01-12 21:36:32

by Conor Dooley

[permalink] [raw]

Subject: Re: [PATCH v3 03/13] riscv: cpufeature: detect RISCV_ALTERNATIVES_EARLY_BOOT earlier

---

On Thu, Jan 12, 2023 at 01:10:17AM +0800, Jisheng Zhang wrote:
> Currently riscv_cpufeature_patch_func() does nothing at the
> RISCV_ALTERNATIVES_EARLY_BOOT stage. Add a check to detect whether we
> are in this stage and exit early. This will allow us to use
> riscv_cpufeature_patch_func() for scanning of all ISA extensions.
>
> Signed-off-by: Jisheng Zhang <[email protected]>
> Reviewed-by: Andrew Jones <[email protected]>
> Reviewed-by: Heiko Stuebner <[email protected]>

Probably overkill at this stage, but:
Reviewed-by: Conor Dooley <[email protected]>

BTW, would you mind CCing me on all patches in a series if I have
previously reviewed the series? Makes life easier :)

> ---
> arch/riscv/kernel/cpufeature.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 421b3d9578cc..37e8c5e69754 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -328,6 +328,9 @@ void __init_or_module riscv_cpufeature_patch_func(struct alt_entry *begin,
> struct alt_entry *alt;
> u32 tmp;
>
> + if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
> + return;
> +
> for (alt = begin; alt < end; alt++) {
> if (alt->vendor_id != 0)
> continue;
> --
> 2.38.1
>
>
> _______________________________________________
> linux-riscv mailing list
> [email protected]
> http://lists.infradead.org/mailman/listinfo/linux-riscv

---

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