linux-kernel - Re: [PATCH v4 04/17] arm64: hibernate: use get_safe

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Date:   Tue, 10 Sep 2019 10:03:44 +0200
From:   Matthias Brugger <mbrugger@...e.com>
To:     Pavel Tatashin <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, bhsharma@...hat.com,
        linux-mm@...ck.org, mark.rutland@....com
Subject: Re: [PATCH v4 04/17] arm64: hibernate: use get_safe_page directly



On 09/09/2019 20:12, Pavel Tatashin wrote:
> 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 227cc26720f7..47a861e0cb0c 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;
>