From: Joerg Roedel <jroedel@xxxxxxx>
Also move it to a header file so that it can be used in the idt code
to setup the early IDT.
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
arch/x86/include/asm/setup.h | 10 ++++++++++
arch/x86/kernel/head64.c | 5 -----
2 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 5c2fd05bd52c..8aa6ba0427b0 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -74,6 +74,16 @@ static inline void x86_ce4100_early_setup(void) { }
extern struct boot_params boot_params;
extern char _text[];
+/*
+ * This function is used in C code that runs while the kernel still runs on
+ * identity mapped addresses to get the correct address of kernel pointers in
+ * the identity mapping.
+ */
+static __always_inline void *fixup_pointer(void *ptr, unsigned long physaddr)
+{
+ return ptr - (void *)_text + (void *)physaddr;
+}
+
static inline bool kaslr_enabled(void)
{
return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index b0ab5627900b..8703292a35e9 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -82,11 +82,6 @@ static struct desc_ptr startup_gdt_descr = {
#define __head __section(.head.text)
-static void __head *fixup_pointer(void *ptr, unsigned long physaddr)
-{
- return ptr - (void *)_text + (void *)physaddr;
-}
-
static unsigned long __head *fixup_long(void *ptr, unsigned long physaddr)
{
return fixup_pointer(ptr, physaddr);
--
2.27.0
