linux-kernel - [PATCH -fixes] riscv: cpufeature: Do not drop Linux-internal extensions

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Message-ID: <20240718213011.2600150-1-samuel.holland@sifive.com>
Date: Thu, 18 Jul 2024 14:29:59 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	linux-riscv@...ts.infradead.org
Cc: Samuel Holland <samuel.holland@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Andrew Jones <ajones@...tanamicro.com>,
	Andy Chiu <andy.chiu@...ive.com>,
	Charlie Jenkins <charlie@...osinc.com>,
	Clément Léger <cleger@...osinc.com>,
	Conor Dooley <conor@...nel.org>,
	Evan Green <evan@...osinc.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH -fixes] riscv: cpufeature: Do not drop Linux-internal extensions

The Linux-internal Xlinuxenvcfg ISA extension is omitted from the
riscv_isa_ext array because it has no DT binding and should not appear
in /proc/cpuinfo. The logic added in commit 625034abd52a ("riscv: add
ISA extensions validation callback") assumes all extensions are included
in riscv_isa_ext, and so riscv_resolve_isa() wrongly drops Xlinuxenvcfg
from the final ISA string. Instead, accept such Linux-internal ISA
extensions as if they have no validation callback.

Fixes: 625034abd52a ("riscv: add ISA extensions validation callback")
Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

 arch/riscv/kernel/cpufeature.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 0366dc3baf33..dd25677d60de 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -457,28 +457,26 @@ static void __init riscv_resolve_isa(unsigned long *source_isa,
 		bitmap_copy(prev_resolved_isa, resolved_isa, RISCV_ISA_EXT_MAX);
 		for_each_set_bit(bit, source_isa, RISCV_ISA_EXT_MAX) {
 			ext = riscv_get_isa_ext_data(bit);
-			if (!ext)
-				continue;
 
-			if (ext->validate) {
+			if (ext && ext->validate) {
 				ret = ext->validate(ext, resolved_isa);
 				if (ret == -EPROBE_DEFER) {
 					loop = true;
 					continue;
 				} else if (ret) {
 					/* Disable the extension entirely */
-					clear_bit(ext->id, source_isa);
+					clear_bit(bit, source_isa);
 					continue;
 				}
 			}
 
-			set_bit(ext->id, resolved_isa);
+			set_bit(bit, resolved_isa);
 			/* No need to keep it in source isa now that it is enabled */
-			clear_bit(ext->id, source_isa);
+			clear_bit(bit, source_isa);
 
 			/* Single letter extensions get set in hwcap */
-			if (ext->id < RISCV_ISA_EXT_BASE)
-				*this_hwcap |= isa2hwcap[ext->id];
+			if (bit < RISCV_ISA_EXT_BASE)
+				*this_hwcap |= isa2hwcap[bit];
 		}
 	} while (loop && memcmp(prev_resolved_isa, resolved_isa, sizeof(prev_resolved_isa)));
 }
-- 
2.45.1