linux-kernel - [RFC PATCH 4/9] riscv: Define is_compat

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Date: Tue, 19 Mar 2024 14:58:30 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	linux-riscv@...ts.infradead.org
Cc: devicetree@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org,
	tech-j-ext@...ts.risc-v.org,
	Conor Dooley <conor@...nel.org>,
	kasan-dev@...glegroups.com,
	Evgenii Stepanov <eugenis@...gle.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Samuel Holland <samuel.holland@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Paul Walmsley <paul.walmsley@...ive.com>
Subject: [RFC PATCH 4/9] riscv: Define is_compat_thread()

This allows checking if some thread other than current is 32-bit.

Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

 arch/riscv/include/asm/compat.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/riscv/include/asm/compat.h b/arch/riscv/include/asm/compat.h
index 2ac955b51148..233c439c12d7 100644
--- a/arch/riscv/include/asm/compat.h
+++ b/arch/riscv/include/asm/compat.h
@@ -12,11 +12,18 @@
 #include <linux/sched/task_stack.h>
 #include <asm-generic/compat.h>
 
+#ifdef CONFIG_COMPAT
+
 static inline int is_compat_task(void)
 {
 	return test_thread_flag(TIF_32BIT);
 }
 
+static inline int is_compat_thread(struct thread_info *thread)
+{
+	return test_ti_thread_flag(thread, TIF_32BIT);
+}
+
 struct compat_user_regs_struct {
 	compat_ulong_t pc;
 	compat_ulong_t ra;
@@ -126,4 +133,13 @@ static inline void cregs_to_regs(struct compat_user_regs_struct *cregs,
 	regs->t6	= (unsigned long) cregs->t6;
 };
 
+#else
+
+static inline int is_compat_thread(struct thread_info *thread)
+{
+	return 0;
+}
+
+#endif
+
 #endif /* __ASM_COMPAT_H */
-- 
2.43.1