linux-kernel - [PATCH v10 2/6] RISC-V: Scalar unaligned access emulated on hotplug CPUs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241017-jesse_unaligned_vector-v10-2-5b33500160f8@rivosinc.com>
Date: Thu, 17 Oct 2024 12:00:19 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Clément Léger <cleger@...osinc.com>, 
 Evan Green <evan@...osinc.com>, Jonathan Corbet <corbet@....net>
Cc: Palmer Dabbelt <palmer@...osinc.com>, linux-riscv@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
 Charlie Jenkins <charlie@...osinc.com>, Jesse Taube <jesse@...osinc.com>, 
 stable@...r.kernel.org
Subject: [PATCH v10 2/6] RISC-V: Scalar unaligned access emulated on
 hotplug CPUs

From: Jesse Taube <jesse@...osinc.com>

The check_unaligned_access_emulated() function should have been called
during CPU hotplug to ensure that if all CPUs had emulated unaligned
accesses, the new CPU also does.

This patch adds the call to check_unaligned_access_emulated() in
the hotplug path.

Fixes: 55e0bf49a0d0 ("RISC-V: Probe misaligned access speed in parallel")
Signed-off-by: Jesse Taube <jesse@...osinc.com>
Reviewed-by: Evan Green <evan@...osinc.com>
Cc: stable@...r.kernel.org
---
 arch/riscv/kernel/unaligned_access_speed.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/kernel/unaligned_access_speed.c b/arch/riscv/kernel/unaligned_access_speed.c
index 160628a2116d..f3508cc54f91 100644
--- a/arch/riscv/kernel/unaligned_access_speed.c
+++ b/arch/riscv/kernel/unaligned_access_speed.c
@@ -191,6 +191,7 @@ static int riscv_online_cpu(unsigned int cpu)
 	if (per_cpu(misaligned_access_speed, cpu) != RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN)
 		goto exit;
 
+	check_unaligned_access_emulated(NULL);
 	buf = alloc_pages(GFP_KERNEL, MISALIGNED_BUFFER_ORDER);
 	if (!buf) {
 		pr_warn("Allocation failure, not measuring misaligned performance\n");

-- 
2.45.0