[RFC][PATCH 3/6] x86/callthunk: No callthunk for restore_processor_state()

[Peter Zijlstra <peterz@infradead.org>]

From: Joan Bruguera <joanbrugueram@gmail.com>

When resuming from suspend we don't have coherent CPU state, trying to
do callthunks here isn't going to work. Specifically GS isn't set yet.

Signed-off-by: Joan Bruguera <joanbrugueram@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230109040531.7888-1-joanbrugueram@gmail.com
---
 arch/x86/kernel/callthunks.c |    5 +++++
 arch/x86/power/cpu.c         |    3 +++
 2 files changed, 8 insertions(+)

--- a/arch/x86/kernel/callthunks.c
+++ b/arch/x86/kernel/callthunks.c
@@ -7,6 +7,7 @@
 #include <linux/memory.h>
 #include <linux/moduleloader.h>
 #include <linux/static_call.h>
+#include <linux/suspend.h>
 
 #include <asm/alternative.h>
 #include <asm/asm-offsets.h>
@@ -151,6 +152,10 @@ static bool skip_addr(void *dest)
 	    dest < (void*)hypercall_page + PAGE_SIZE)
 		return true;
 #endif
+#ifdef CONFIG_PM_SLEEP
+	if (dest == restore_processor_state)
+		return true;
+#endif
 	return false;
 }