linux-kernel - [PATCH V2 2/5] riscv: spinwait: Fix hartid variable type

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Message-Id: <20220526101131.2340729-3-sunilvl@ventanamicro.com>
Date:   Thu, 26 May 2022 15:41:28 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Atish Patra <atishp@...osinc.com>,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        Anup Patel <apatel@...tanamicro.com>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org, Sunil V L <sunil.vl@...il.com>,
        Sunil V L <sunilvl@...tanamicro.com>, stable@...r.kernel.org
Subject: [PATCH V2 2/5] riscv: spinwait: Fix hartid variable type

The hartid variable is of type int but compared with
ULONG_MAX(INVALID_HARTID). This issue is fixed by changing
the hartid variable type to unsigned long.

Fixes: c78f94f35cf6 ("RISC-V: Use __cpu_up_stack/task_pointer only for spinwait method")
Cc: stable@...r.kernel.org

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 arch/riscv/kernel/cpu_ops_spinwait.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/cpu_ops_spinwait.c b/arch/riscv/kernel/cpu_ops_spinwait.c
index 346847f6c41c..3ade9152a3c7 100644
--- a/arch/riscv/kernel/cpu_ops_spinwait.c
+++ b/arch/riscv/kernel/cpu_ops_spinwait.c
@@ -18,7 +18,7 @@ void *__cpu_spinwait_task_pointer[NR_CPUS] __section(".data");
 static void cpu_update_secondary_bootdata(unsigned int cpuid,
 				   struct task_struct *tidle)
 {
-	int hartid = cpuid_to_hartid_map(cpuid);
+	unsigned long hartid = cpuid_to_hartid_map(cpuid);
 
 	/*
 	 * The hartid must be less than NR_CPUS to avoid out-of-bound access
@@ -27,7 +27,7 @@ static void cpu_update_secondary_bootdata(unsigned int cpuid,
 	 * spinwait booting is not the recommended approach for any platforms
 	 * booting Linux in S-mode and can be disabled in the future.
 	 */
-	if (hartid == INVALID_HARTID || hartid >= NR_CPUS)
+	if (hartid == INVALID_HARTID || hartid >= (unsigned long) NR_CPUS)
 		return;
 
 	/* Make sure tidle is updated */
-- 
2.25.1