[PATCH v2 5/7] x86/callthunk: No callthunk for restore_processor_state()

[Peter Zijlstra]

From: Joan Bruguera <joanbrugue...@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.

Fixes: e81dc127ef69 ("x86/callthunks: Add call patching for call depth 
tracking")
Signed-off-by: Joan Bruguera <joanbrugue...@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Link: https://lkml.kernel.org/r/20230109040531.7888-1-joanbrugue...@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;
 }