From: Yury Norov <yury.norov@gmail.com>
Date: Thu, 13 Mar 2025 02:19:51 +0000 (-0400)
Subject: riscv: switch set_icache_stale_mask() to using non-atomic assign_cpu()
X-Git-Tag: v6.16-rc1~70^2~12
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e5bf9a4b68fae70e41d1410656490d8ac00c02fe;p=thirdparty%2Flinux.git

riscv: switch set_icache_stale_mask() to using non-atomic assign_cpu()

The atomic cpumask_assign_cpu() follows non-atomic cpumask_setall(),
which makes the whole operation non-atomic. Fix this by relaxing to
non-atomic __assign_cpu().

Fixes: 7c1e5b9690b0e14 ("riscv: Disable preemption while handling PR_RISCV_CTX_SW_FENCEI_OFF")
Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
---

diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c
index b816727298872..b8e96dfff19dd 100644
--- a/arch/riscv/mm/cacheflush.c
+++ b/arch/riscv/mm/cacheflush.c
@@ -172,7 +172,7 @@ static void set_icache_stale_mask(void)
 	stale_cpu = cpumask_test_cpu(cpu, mask);
 
 	cpumask_setall(mask);
-	cpumask_assign_cpu(cpu, mask, stale_cpu);
+	__assign_cpu(cpu, mask, stale_cpu);
 	put_cpu();
 }
 #endif