linux-kernel - Re: [PATCH v3 03/10] mm/x86: Replace p4d_large() with p4d

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Message-ID: <ZegLy9z7cdROGL3D@kernel.org>
Date: Wed, 6 Mar 2024 08:23:07 +0200
From: Mike Rapoport <rppt@...nel.org>
To: peterx@...hat.com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Christophe Leroy <christophe.leroy@...roup.eu>, x86@...nel.org,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	Jason Gunthorpe <jgg@...dia.com>, Yang Shi <shy828301@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linuxppc-dev@...ts.ozlabs.org, Muchun Song <muchun.song@...ux.dev>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v3 03/10] mm/x86: Replace p4d_large() with p4d_leaf()

On Tue, Mar 05, 2024 at 12:37:43PM +0800, peterx@...hat.com wrote:
> From: Peter Xu <peterx@...hat.com>
> 
> p4d_large() is always defined as p4d_leaf().  Merge their usages.  Chose
> p4d_leaf() because p4d_leaf() is a global API, while p4d_large() is not.
> 
> Only x86 has p4d_leaf() defined as of now.  So it also means after this
> patch we removed all p4d_large() usages.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: x86@...nel.org
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Peter Xu <peterx@...hat.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>

> ---
>  arch/x86/mm/fault.c          | 4 ++--
>  arch/x86/mm/init_64.c        | 2 +-
>  arch/x86/mm/pat/set_memory.c | 4 ++--
>  arch/x86/mm/pti.c            | 2 +-
>  arch/x86/power/hibernate.c   | 2 +-
>  arch/x86/xen/mmu_pv.c        | 2 +-
>  6 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
> index 679b09cfe241..8b69ce3f4115 100644
> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -368,7 +368,7 @@ static void dump_pagetable(unsigned long address)
>  		goto bad;
>  
>  	pr_cont("P4D %lx ", p4d_val(*p4d));
> -	if (!p4d_present(*p4d) || p4d_large(*p4d))
> +	if (!p4d_present(*p4d) || p4d_leaf(*p4d))
>  		goto out;
>  
>  	pud = pud_offset(p4d, address);
> @@ -1039,7 +1039,7 @@ spurious_kernel_fault(unsigned long error_code, unsigned long address)
>  	if (!p4d_present(*p4d))
>  		return 0;
>  
> -	if (p4d_large(*p4d))
> +	if (p4d_leaf(*p4d))
>  		return spurious_kernel_fault_check(error_code, (pte_t *) p4d);
>  
>  	pud = pud_offset(p4d, address);
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index ebdbcae48011..d691e7992a9a 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -1197,7 +1197,7 @@ remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
>  		if (!p4d_present(*p4d))
>  			continue;
>  
> -		BUILD_BUG_ON(p4d_large(*p4d));
> +		BUILD_BUG_ON(p4d_leaf(*p4d));
>  
>  		pud_base = pud_offset(p4d, 0);
>  		remove_pud_table(pud_base, addr, next, altmap, direct);
> diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
> index e9b448d1b1b7..5359a9c88099 100644
> --- a/arch/x86/mm/pat/set_memory.c
> +++ b/arch/x86/mm/pat/set_memory.c
> @@ -676,7 +676,7 @@ pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
>  		return NULL;
>  
>  	*level = PG_LEVEL_512G;
> -	if (p4d_large(*p4d) || !p4d_present(*p4d))
> +	if (p4d_leaf(*p4d) || !p4d_present(*p4d))
>  		return (pte_t *)p4d;
>  
>  	pud = pud_offset(p4d, address);
> @@ -739,7 +739,7 @@ pmd_t *lookup_pmd_address(unsigned long address)
>  		return NULL;
>  
>  	p4d = p4d_offset(pgd, address);
> -	if (p4d_none(*p4d) || p4d_large(*p4d) || !p4d_present(*p4d))
> +	if (p4d_none(*p4d) || p4d_leaf(*p4d) || !p4d_present(*p4d))
>  		return NULL;
>  
>  	pud = pud_offset(p4d, address);
> diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
> index 669ba1c345b3..dc0a81f5f60e 100644
> --- a/arch/x86/mm/pti.c
> +++ b/arch/x86/mm/pti.c
> @@ -206,7 +206,7 @@ static pmd_t *pti_user_pagetable_walk_pmd(unsigned long address)
>  	if (!p4d)
>  		return NULL;
>  
> -	BUILD_BUG_ON(p4d_large(*p4d) != 0);
> +	BUILD_BUG_ON(p4d_leaf(*p4d) != 0);
>  	if (p4d_none(*p4d)) {
>  		unsigned long new_pud_page = __get_free_page(gfp);
>  		if (WARN_ON_ONCE(!new_pud_page))
> diff --git a/arch/x86/power/hibernate.c b/arch/x86/power/hibernate.c
> index 6f955eb1e163..28153789f873 100644
> --- a/arch/x86/power/hibernate.c
> +++ b/arch/x86/power/hibernate.c
> @@ -165,7 +165,7 @@ int relocate_restore_code(void)
>  	pgd = (pgd_t *)__va(read_cr3_pa()) +
>  		pgd_index(relocated_restore_code);
>  	p4d = p4d_offset(pgd, relocated_restore_code);
> -	if (p4d_large(*p4d)) {
> +	if (p4d_leaf(*p4d)) {
>  		set_p4d(p4d, __p4d(p4d_val(*p4d) & ~_PAGE_NX));
>  		goto out;
>  	}
> diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
> index e21974f2cf2d..12a43a4abebf 100644
> --- a/arch/x86/xen/mmu_pv.c
> +++ b/arch/x86/xen/mmu_pv.c
> @@ -1104,7 +1104,7 @@ static void __init xen_cleanmfnmap_p4d(p4d_t *p4d, bool unpin)
>  	pud_t *pud_tbl;
>  	int i;
>  
> -	if (p4d_large(*p4d)) {
> +	if (p4d_leaf(*p4d)) {
>  		pa = p4d_val(*p4d) & PHYSICAL_PAGE_MASK;
>  		xen_free_ro_pages(pa, P4D_SIZE);
>  		return;
> -- 
> 2.44.0
> 
> 

-- 
Sincerely yours,
Mike.