[PATCH 05/12] arm64: mm: Remove VMALLOC checks from update_mapping_prot(.)

[Steve Capper]

update_mapping_prot assumes that it will be used on the VA for the
kernel .text section. (Via the check virt >= VMALLOC_START)

Recent kdump patches employ this function to modify the protection of
the direct linear mapping (which is strictly speaking outside of this
area), via mark_linear_text_alias_ro(.).

We "get away" with this as the direct linear mapping currently follows
the VA for the kernel text, so the check passes.

This patch removes the check in update_mapping_prot allowing us to move
the kernel VA layout without spuriously firing the warning.

Signed-off-by: Steve Capper <steve.capper at arm.com>
---
 arch/arm64/mm/mmu.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 58b1ed6fd7ec..c8f486384fe3 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -383,12 +383,6 @@ void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
 static void update_mapping_prot(phys_addr_t phys, unsigned long virt,
 				phys_addr_t size, pgprot_t prot)
 {
-	if (virt < VMALLOC_START) {
-		pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n",
-			&phys, virt);
-		return;
-	}
-
 	__create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
 			     NO_CONT_MAPPINGS);
 
-- 
2.11.0