linux-kernel - [PATCH 4/9] riscv: Constify sbi_ipi

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Message-ID: <20210330022354.385a9a52@xhacker>
Date:   Tue, 30 Mar 2021 02:23:54 +0800
From:   Jisheng Zhang <jszhang3@...l.ustc.edu.cn>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        " Björn Töpel" <bjorn@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH 4/9] riscv: Constify sbi_ipi_ops

From: Jisheng Zhang <jszhang@...nel.org>

Constify the sbi_ipi_ops so that it will be placed in the .rodata
section. This will cause attempts to modify it to fail when strict
page permissions are in place.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 arch/riscv/include/asm/smp.h | 4 ++--
 arch/riscv/kernel/sbi.c      | 2 +-
 arch/riscv/kernel/smp.c      | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
index df1f7c4cd433..a7d2811f3536 100644
--- a/arch/riscv/include/asm/smp.h
+++ b/arch/riscv/include/asm/smp.h
@@ -46,7 +46,7 @@ int riscv_hartid_to_cpuid(int hartid);
 void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
 
 /* Set custom IPI operations */
-void riscv_set_ipi_ops(struct riscv_ipi_ops *ops);
+void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops);
 
 /* Clear IPI for current CPU */
 void riscv_clear_ipi(void);
@@ -92,7 +92,7 @@ static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in,
 	cpumask_set_cpu(boot_cpu_hartid, out);
 }
 
-static inline void riscv_set_ipi_ops(struct riscv_ipi_ops *ops)
+static inline void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
 {
 }
 
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
index cbd94a72eaa7..cb848e80865e 100644
--- a/arch/riscv/kernel/sbi.c
+++ b/arch/riscv/kernel/sbi.c
@@ -556,7 +556,7 @@ static void sbi_send_cpumask_ipi(const struct cpumask *target)
 	sbi_send_ipi(cpumask_bits(&hartid_mask));
 }
 
-static struct riscv_ipi_ops sbi_ipi_ops = {
+static const struct riscv_ipi_ops sbi_ipi_ops = {
 	.ipi_inject = sbi_send_cpumask_ipi
 };
 
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index 504284d49135..e035124f06dc 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -85,9 +85,9 @@ static void ipi_stop(void)
 		wait_for_interrupt();
 }
 
-static struct riscv_ipi_ops *ipi_ops __ro_after_init;
+static const struct riscv_ipi_ops *ipi_ops __ro_after_init;
 
-void riscv_set_ipi_ops(struct riscv_ipi_ops *ops)
+void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
 {
 	ipi_ops = ops;
 }
-- 
2.31.0