X-Git-Url: https://git.stricted.de/?p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git;a=blobdiff_plain;f=arch%2Farm64%2Fkernel%2Fprocess.c;h=ad14dbc07db8d4a135fdb64226b4ae87f87b7ddc;hp=238c54a8d013de0b6153afb2cc7c4f16698f25fd;hb=f29ec40f359012249b26de0356211275656f5a72;hpb=b4350432998578500203d562d5b093c6a5beadd2

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 238c54a8d013..ad14dbc07db8 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -355,9 +355,27 @@ void exit_thread(void)
 {
 }
 
+static void tls_thread_flush(void)
+{
+	asm ("msr tpidr_el0, xzr");
+
+	if (is_compat_task()) {
+		current->thread.tp_value = 0;
+
+		/*
+		 * We need to ensure ordering between the shadow state and the
+		 * hardware state, so that we don't corrupt the hardware state
+		 * with a stale shadow state during context switch.
+		 */
+		barrier();
+		asm ("msr tpidrro_el0, xzr");
+	}
+}
+
 void flush_thread(void)
 {
 	fpsimd_flush_thread();
+	tls_thread_flush();
 	flush_ptrace_hw_breakpoint(current);
 }