From 62ed767ba08fc1ad10c8c95ee65855660c410990 Mon Sep 17 00:00:00 2001
From: =?utf8?q?J=2E=20Neusch=C3=A4fer?= <j.neuschaefer@gmx.net>
Date: Fri, 13 Jun 2025 17:59:32 +0200
Subject: [PATCH] linux-user/arm: Fix return value of SYS_cacheflush
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Although the emulated cacheflush syscall does nothing, it still needs to
return zero to indicate success.

Cc: qemu-stable@nongnu.org
Signed-off-by: J. Neuschäfer <j.neuschaefer@gmx.net>
Message-id: 20250613-cache-v1-1-ee9f4a9ba81b@gmx.net
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit 5ad2b1f443a96444cf3e7a2fbe17aae696201012)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
---
 linux-user/arm/cpu_loop.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index 85804c367a8..f87e85c9e60 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -395,6 +395,7 @@ void cpu_loop(CPUARMState *env)
                     switch (n) {
                     case ARM_NR_cacheflush:
                         /* nop */
+                        env->regs[0] = 0;
                         break;
                     case ARM_NR_set_tls:
                         cpu_set_tls(env, env->regs[0]);
-- 
2.47.3