[RFC PATCH v1 04/28] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv

debug
2024-01-25T06:28:34Z

From: Deepak Gupta <debug@rivosinc.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@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 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