linux-kernel - [RFC PATCH v1 04/28] riscv/Kconfig: enable HAVE_EXIT

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Date: Wed, 24 Jan 2024 22:21:29 -0800
From: debug@...osinc.com
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Subject: [RFC PATCH v1 04/28] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv

From: Deepak Gupta <debug@...osinc.com>

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@...osinc.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 95a2a06acc6a..9d386e9edc45 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -142,6 +142,7 @@ config RISCV
 	select HAVE_RSEQ
 	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 2420123444c4..c249cf3d8083 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -192,6 +192,11 @@ 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;
-- 
2.43.0