linux-kernel - [PATCH v6 04/17] arm64: hibernate: use get_safe

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Date:   Fri,  4 Oct 2019 14:52:21 -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, marc.zyngier@....com,
        james.morse@....com, vladimir.murzin@....com,
        matthias.bgg@...il.com, bhsharma@...hat.com, linux-mm@...ck.org,
        mark.rutland@....com
Subject: [PATCH v6 04/17] arm64: hibernate: use get_safe_page directly

create_safe_exec_page() uses hibernate's allocator to create a set of page
table to map a single page that will contain the relocation code.

Remove the allocator related arguments, and use get_safe_page directly, as
it is done in other local functions in this file to simplify function
prototype.

Removing this function pointer makes it easier to refactor the code later.

Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
Reviewed-by: Matthias Brugger <mbrugger@...e.com>
---
 arch/arm64/kernel/hibernate.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index ef46ce66d7e8..34297716643f 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -196,9 +196,7 @@ EXPORT_SYMBOL(arch_hibernation_header_restore);
  */
 static int create_safe_exec_page(void *src_start, size_t length,
 				 unsigned long dst_addr,
-				 phys_addr_t *phys_dst_addr,
-				 void *(*allocator)(gfp_t mask),
-				 gfp_t mask)
+				 phys_addr_t *phys_dst_addr)
 {
 	int rc = 0;
 	pgd_t *trans_pgd;
@@ -206,7 +204,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
 	pud_t *pudp;
 	pmd_t *pmdp;
 	pte_t *ptep;
-	unsigned long dst = (unsigned long)allocator(mask);
+	unsigned long dst = get_safe_page(GFP_ATOMIC);
 
 	if (!dst) {
 		rc = -ENOMEM;
@@ -216,7 +214,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
 	memcpy((void *)dst, src_start, length);
 	__flush_icache_range(dst, dst + length);
 
-	trans_pgd = allocator(mask);
+	trans_pgd = (void *)get_safe_page(GFP_ATOMIC);
 	if (!trans_pgd) {
 		rc = -ENOMEM;
 		goto out;
@@ -224,7 +222,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
 
 	pgdp = pgd_offset_raw(trans_pgd, dst_addr);
 	if (pgd_none(READ_ONCE(*pgdp))) {
-		pudp = allocator(mask);
+		pudp = (void *)get_safe_page(GFP_ATOMIC);
 		if (!pudp) {
 			rc = -ENOMEM;
 			goto out;
@@ -234,7 +232,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
 
 	pudp = pud_offset(pgdp, dst_addr);
 	if (pud_none(READ_ONCE(*pudp))) {
-		pmdp = allocator(mask);
+		pmdp = (void *)get_safe_page(GFP_ATOMIC);
 		if (!pmdp) {
 			rc = -ENOMEM;
 			goto out;
@@ -244,7 +242,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
 
 	pmdp = pmd_offset(pudp, dst_addr);
 	if (pmd_none(READ_ONCE(*pmdp))) {
-		ptep = allocator(mask);
+		ptep = (void *)get_safe_page(GFP_ATOMIC);
 		if (!ptep) {
 			rc = -ENOMEM;
 			goto out;
@@ -530,8 +528,7 @@ int swsusp_arch_resume(void)
 	 */
 	rc = create_safe_exec_page(__hibernate_exit_text_start, exit_size,
 				   (unsigned long)hibernate_exit,
-				   &phys_hibernate_exit,
-				   (void *)get_safe_page, GFP_ATOMIC);
+				   &phys_hibernate_exit);
 	if (rc) {
 		pr_err("Failed to create safe executable page for hibernate_exit code.\n");
 		goto out;
-- 
2.23.0