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+qemu-system-mipsel regression, Linux generated with Buildroot does not boot anymore
+Description of problem:
+Buildroot Toolchain Builders try to release a new version. See a message from Thomas Petazzoni with the remaining issues:
+https://lore.kernel.org/buildroot/20240730223542.273693e5@windsurf/T/#u
+
+All toolchains generate a system that fails to boot:
+
+Run /sbin/init as init process
+process '/bin/busybox' started with executable stack
+Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
+
+The interesting thing is that those images boot fine with Qemu v8.2.6,
+but they fail to boot with Qemu v9.0.2.
+
+I tracked it down to this commit:
+commit 4e999bf4197ae3dc58b7092260f98146920a7469
+Author: Richard Henderson <richard.henderson@linaro.org>
+Date:   Sun Jan 28 15:58:52 2024 +1000
+
+    target/mips: Pass ptw_mmu_idx down from mips_cpu_tlb_fill
+    
+    Rather than adjust env->hflags so that the value computed
+    by cpu_mmu_index() changes, compute the mmu_idx that we
+    want directly and pass it down.
+    
+    Introduce symbolic constants for MMU_{KERNEL,ERL}_IDX.
+    
+    Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+    Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+
+Unfortunately just reverting this commit in 9.0.2 does not help, Qemu segfaults on Linux Kernel boot then.