arm64: move kimage_vaddr to .rodata

This datum is not referenced from .idmap.text: it does not need to be
mapped in idmap. Lets move it to .rodata as it is never written to after
early boot of the primary CPU.
(Maybe .data.ro_after_init would be cleaner though?)

Signed-off-by: Rémi Denis-Courmont <[email protected]>
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

Author: Remi Denis-Courmont

arch/arm64/kernel/head.S

@@ -458,17 +458,19 @@ SYM_FUNC_START_LOCAL(__primary_switched)
 	b	start_kernel
 SYM_FUNC_END(__primary_switched)
 
+	.pushsection ".rodata", "a"
+SYM_DATA_START(kimage_vaddr)
+	.quad		_text - TEXT_OFFSET
+SYM_DATA_END(kimage_vaddr)
+EXPORT_SYMBOL(kimage_vaddr)
+	.popsection
+
 /*
  * end early head section, begin head code that is also used for
  * hotplug and needs to have the same protections as the text region
  */
 	.section ".idmap.text","awx"
 
-SYM_DATA_START(kimage_vaddr)
-	.quad		_text - TEXT_OFFSET
-SYM_DATA_END(kimage_vaddr)
-EXPORT_SYMBOL(kimage_vaddr)
-
 /*
  * If we're fortunate enough to boot at EL2, ensure that the world is
  * sane before dropping to EL1.