linux-kernel - [PATCH v9 2/4] riscv: Only check online cpus for emulated accesses

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Message-Id: <20240308-disable_misaligned_probe_config-v9-2-a388770ba0ce@rivosinc.com>
Date: Fri, 08 Mar 2024 10:25:56 -0800
From: Charlie Jenkins <charlie@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Jisheng Zhang <jszhang@...nel.org>, Evan Green <evan@...osinc.com>, 
 Clément Léger <cleger@...osinc.com>, 
 Eric Biggers <ebiggers@...nel.org>, 
 Elliot Berman <quic_eberman@...cinc.com>, Charles Lohr <lohr85@...il.com>, 
 Conor Dooley <conor.dooley@...rochip.com>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Charlie Jenkins <charlie@...osinc.com>
Subject: [PATCH v9 2/4] riscv: Only check online cpus for emulated accesses

The unaligned access checker only sets valid values for online cpus.
Check for these values on online cpus rather than on present cpus.

Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
Fixes: 71c54b3d169d ("riscv: report misaligned accesses emulation to hwprobe")
---
 arch/riscv/kernel/traps_misaligned.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c
index 8ded225e8c5b..c2ed4e689bf9 100644
--- a/arch/riscv/kernel/traps_misaligned.c
+++ b/arch/riscv/kernel/traps_misaligned.c
@@ -632,7 +632,7 @@ void unaligned_emulation_finish(void)
 	 * accesses emulated since tasks requesting such control can run on any
 	 * CPU.
 	 */
-	for_each_present_cpu(cpu) {
+	for_each_online_cpu(cpu) {
 		if (per_cpu(misaligned_access_speed, cpu) !=
 					RISCV_HWPROBE_MISALIGNED_EMULATED) {
 			return;

-- 
2.43.2