linux-kernel - [PATCH v15 15/15] arm64: trans_pgd: remove trans_pgd_map

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Message-Id: <20210609004419.936873-16-pasha.tatashin@soleen.com>
Date:   Tue,  8 Jun 2021 20:44:19 -0400
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     pasha.tatashin@...een.com, jmorris@...ei.org, sashal@...nel.org,
        ebiederm@...ssion.com, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, corbet@....net,
        catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org, maz@...nel.org,
        james.morse@....com, vladimir.murzin@....com,
        matthias.bgg@...il.com, linux-mm@...ck.org, mark.rutland@....com,
        steve.capper@....com, rfontana@...hat.com, tglx@...utronix.de,
        selindag@...il.com, tyhicks@...ux.microsoft.com,
        kernelfans@...il.com, akpm@...ux-foundation.org,
        madvenka@...ux.microsoft.com
Subject: [PATCH v15 15/15] arm64: trans_pgd: remove trans_pgd_map_page()

The intend of trans_pgd_map_page() was to map contiguous range of VA
memory to the memory that is getting relocated during kexec. However,
since we are now using linear map instead of contiguous range this
function is not needed

Suggested-by: Pingfan Liu <kernelfans@...il.com>
Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
---
 arch/arm64/include/asm/trans_pgd.h |  5 +--
 arch/arm64/mm/trans_pgd.c          | 57 ------------------------------
 2 files changed, 1 insertion(+), 61 deletions(-)

diff --git a/arch/arm64/include/asm/trans_pgd.h b/arch/arm64/include/asm/trans_pgd.h
index 411323bda7a4..c373d43c07ec 100644
--- a/arch/arm64/include/asm/trans_pgd.h
+++ b/arch/arm64/include/asm/trans_pgd.h
@@ -15,7 +15,7 @@
 /*
  * trans_alloc_page
  *	- Allocator that should return exactly one zeroed page, if this
- *	  allocator fails, trans_pgd_create_copy() and trans_pgd_map_page()
+ *	  allocator fails, trans_pgd_create_copy() and trans_pgd_idmap_page()
  *	  return -ENOMEM error.
  *
  * trans_alloc_arg
@@ -30,9 +30,6 @@ struct trans_pgd_info {
 int trans_pgd_create_copy(struct trans_pgd_info *info, pgd_t **trans_pgd,
 			  unsigned long start, unsigned long end);
 
-int trans_pgd_map_page(struct trans_pgd_info *info, pgd_t *trans_pgd,
-		       void *page, unsigned long dst_addr, pgprot_t pgprot);
-
 int trans_pgd_idmap_page(struct trans_pgd_info *info, phys_addr_t *trans_ttbr0,
 			 unsigned long *t0sz, void *page);
 
diff --git a/arch/arm64/mm/trans_pgd.c b/arch/arm64/mm/trans_pgd.c
index d4f0a6492d8f..7ae27a948145 100644
--- a/arch/arm64/mm/trans_pgd.c
+++ b/arch/arm64/mm/trans_pgd.c
@@ -217,63 +217,6 @@ int trans_pgd_create_copy(struct trans_pgd_info *info, pgd_t **dst_pgdp,
 	return rc;
 }
 
-/*
- * Add map entry to trans_pgd for a base-size page at PTE level.
- * info:	contains allocator and its argument
- * trans_pgd:	page table in which new map is added.
- * page:	page to be mapped.
- * dst_addr:	new VA address for the page
- * pgprot:	protection for the page.
- *
- * Returns 0 on success, and -ENOMEM on failure.
- */
-int trans_pgd_map_page(struct trans_pgd_info *info, pgd_t *trans_pgd,
-		       void *page, unsigned long dst_addr, pgprot_t pgprot)
-{
-	pgd_t *pgdp;
-	p4d_t *p4dp;
-	pud_t *pudp;
-	pmd_t *pmdp;
-	pte_t *ptep;
-
-	pgdp = pgd_offset_pgd(trans_pgd, dst_addr);
-	if (pgd_none(READ_ONCE(*pgdp))) {
-		p4dp = trans_alloc(info);
-		if (!pgdp)
-			return -ENOMEM;
-		pgd_populate(NULL, pgdp, p4dp);
-	}
-
-	p4dp = p4d_offset(pgdp, dst_addr);
-	if (p4d_none(READ_ONCE(*p4dp))) {
-		pudp = trans_alloc(info);
-		if (!pudp)
-			return -ENOMEM;
-		p4d_populate(NULL, p4dp, pudp);
-	}
-
-	pudp = pud_offset(p4dp, dst_addr);
-	if (pud_none(READ_ONCE(*pudp))) {
-		pmdp = trans_alloc(info);
-		if (!pmdp)
-			return -ENOMEM;
-		pud_populate(NULL, pudp, pmdp);
-	}
-
-	pmdp = pmd_offset(pudp, dst_addr);
-	if (pmd_none(READ_ONCE(*pmdp))) {
-		ptep = trans_alloc(info);
-		if (!ptep)
-			return -ENOMEM;
-		pmd_populate_kernel(NULL, pmdp, ptep);
-	}
-
-	ptep = pte_offset_kernel(pmdp, dst_addr);
-	set_pte(ptep, pfn_pte(virt_to_pfn(page), pgprot));
-
-	return 0;
-}
-
 /*
  * The page we want to idmap may be outside the range covered by VA_BITS that
  * can be built using the kernel's p?d_populate() helpers. As a one off, for a
-- 
2.25.1