[PATCH 1/3] arm64: mm: get rid of kimage_vaddr global variable
Ard Biesheuvel
ardb at kernel.org
Tue Nov 15 06:38:22 PST 2022
We store the address of _text in kimage_vaddr, but since commit
09e3c22a86f6889d ("arm64: Use a variable to store non-global mappings
decision"), we no longer reference this variable from modules so we no
longer need to export it.
In fact, we don't need it at all so let's just get rid of it.
Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
---
arch/arm64/include/asm/memory.h | 6 ++----
arch/arm64/kernel/head.S | 2 +-
arch/arm64/mm/mmu.c | 3 ---
3 files changed, 3 insertions(+), 8 deletions(-)
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 78e5163836a0ab95..a4e1d832a15a2d7a 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -182,6 +182,7 @@
#include <linux/types.h>
#include <asm/boot.h>
#include <asm/bug.h>
+#include <asm/sections.h>
#if VA_BITS > 48
extern u64 vabits_actual;
@@ -193,15 +194,12 @@ extern s64 memstart_addr;
/* PHYS_OFFSET - the physical address of the start of memory. */
#define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
-/* the virtual base of the kernel image */
-extern u64 kimage_vaddr;
-
/* the offset between the kernel virtual and physical mappings */
extern u64 kimage_voffset;
static inline unsigned long kaslr_offset(void)
{
- return kimage_vaddr - KIMAGE_VADDR;
+ return (u64)&_text - KIMAGE_VADDR;
}
static inline bool kaslr_enabled(void)
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 3ea5bf0a6e177e51..3b3c5e8e84af890e 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -399,7 +399,7 @@ SYM_FUNC_START_LOCAL(__primary_switched)
str_l x21, __fdt_pointer, x5 // Save FDT pointer
- ldr_l x4, kimage_vaddr // Save the offset between
+ adrp x4, _text // Save the offset between
sub x4, x4, x0 // the kernel virtual and
str_l x4, kimage_voffset, x5 // physical mappings
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 6942255056aed5ae..a9714b00f5410d7d 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -50,9 +50,6 @@ u64 vabits_actual __ro_after_init = VA_BITS_MIN;
EXPORT_SYMBOL(vabits_actual);
#endif
-u64 kimage_vaddr __ro_after_init = (u64)&_text;
-EXPORT_SYMBOL(kimage_vaddr);
-
u64 kimage_voffset __ro_after_init;
EXPORT_SYMBOL(kimage_voffset);
--
2.35.1
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