linux-kernel - [PATCH v5 02/13] riscv: cpufeature: detect RISCV_ALTERNATIVES_EARLY

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Message-Id: <20230128172856.3814-3-jszhang@kernel.org>
Date:   Sun, 29 Jan 2023 01:28:45 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Andrew Jones <ajones@...tanamicro.com>,
        Conor Dooley <conor.dooley@...rochip.com>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org
Subject: [PATCH v5 02/13] 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 <jszhang@...nel.org>
Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
---
 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 62443fd32fa7..59e20cad1b3d 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -330,6 +330,9 @@ 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