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From: Deepak Gupta <debug@rivosinc.com>
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Subject: [PATCH v2 03/27] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv
Date: Thu, 28 Mar 2024 21:44:35 -0700
Message-Id: <20240329044459.3990638-4-debug@rivosinc.com>
In-Reply-To: <20240329044459.3990638-1-debug@rivosinc.com>
References: <20240329044459.3990638-1-debug@rivosinc.com>
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riscv will need an implementation for exit_thread to clean up shadow stack
when thread exits. If current thread had shadow stack enabled, shadow
stack is allocated by default for any new thread.

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
---
 arch/riscv/Kconfig          | 1 +
 arch/riscv/kernel/process.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index e3142ce531a0..7e0b2bcc388f 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -149,6 +149,7 @@ config RISCV
 	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
+	select HAVE_EXIT_THREAD
 	select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 9a85c9d4c902..d864eef5a10d 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -195,6 +195,11 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 	return 0;
 }
 
+void exit_thread(struct task_struct *tsk)
+{
+	return;
+}
+
 int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
 {
 	unsigned long clone_flags = args->flags;
-- 
2.43.2