Re: [PATCH 1/4] powerpc: mm: Replace p{u,m,4}d_is_leaf with p{u,m,4}_leaf

[Rohan McLure <rmclure@linux.ibm.com>]

> On 7 Nov 2022, at 9:49 am, Rohan McLure <rmclure@linux.ibm.com> wrote:
> 
> Replace occurrences of p{u,m,4}d_is_leaf with p{u,m,4}_leaf, as the
> latter is the name given to checking that a higher-level entry in
> multi-level paging contains a page translation entry (pte). This commit
> allows for p{u,m,4}d_leaf to be used on all powerpc platforms.
> 
> Prior to this commit, the two names have both been present in the
> kernel, having as far as I can tell the same exact purpose. While the
> 'is' in the title may better indicate that the macro/function is a
> boolean returning check, the former naming scheme is standard through
> all other architectures.
> 
> 32-bit systems import pgtable-nop4d.h which defines a default pud_leaf.
> Define pud_leaf preprocessor macro on both Book3E/S 32-bit to avoid
> including the default definition in asm/pgtable.h.
> 
> Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
> ---
> V4: new patch.
> ---
> arch/powerpc/include/asm/book3s/32/pgtable.h |  2 +-
> arch/powerpc/include/asm/book3s/64/pgtable.h | 10 ++++------
> arch/powerpc/include/asm/nohash/32/pgtable.h |  1 +
> arch/powerpc/include/asm/pgtable.h           | 18 +++++++++---------
> arch/powerpc/kvm/book3s_64_mmu_radix.c       | 12 ++++++------
> arch/powerpc/mm/book3s64/radix_pgtable.c     | 14 +++++++-------
> arch/powerpc/mm/pgtable.c                    |  6 +++---
> arch/powerpc/mm/pgtable_64.c                 |  6 +++---
> arch/powerpc/xmon/xmon.c                     |  6 +++---
> 9 files changed, 37 insertions(+), 38 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
> index 75823f39e042..f1b91ad8f3a5 100644
> --- a/arch/powerpc/include/asm/book3s/32/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
> @@ -234,6 +234,7 @@ void unmap_kernel_page(unsigned long va);
> #define pte_clear(mm, addr, ptep) \
> do { pte_update(mm, addr, ptep, ~_PAGE_HASHPTE, 0, 0); } while (0)
> 
> +#define pud_leaf pud_leaf
> #define pmd_none(pmd) (!pmd_val(pmd))
> #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD)
> #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK)
> @@ -242,7 +243,6 @@ static inline void pmd_clear(pmd_t *pmdp)
> *pmdp = __pmd(0);
> }
> 
> -
> /*
>  * When flushing the tlb entry for a page, we also need to flush the hash
>  * table entry.  flush_hash_pages is assembler (for speed) in hashtable.S.
> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
> index c436d8422654..3f51de24e4fc 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
> @@ -1426,16 +1426,14 @@ static inline bool is_pte_rw_upgrade(unsigned long old_val, unsigned long new_va
> /*
>  * Like pmd_huge() and pmd_large(), but works regardless of config options
>  */
> -#define pmd_is_leaf pmd_is_leaf
> -#define pmd_leaf pmd_is_leaf
> -static inline bool pmd_is_leaf(pmd_t pmd)
> +#define pmd_leaf pmd_leaf
> +static inline bool pmd_leaf(pmd_t pmd)
> {
> return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
> }
> 
> -#define pud_is_leaf pud_is_leaf
> -#define pud_leaf pud_is_leaf
> -static inline bool pud_is_leaf(pud_t pud)
> +#define pud_leaf pud_leaf
> +static inline bool pud_leaf(pud_t pud)
> {
> return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
> }
> diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
> index 0d40b33184eb..04a3b0b128eb 100644
> --- a/arch/powerpc/include/asm/nohash/32/pgtable.h
> +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
> @@ -201,6 +201,7 @@ static inline pte_t pte_mkexec(pte_t pte)
> }
> #endif
> 
> +#define pud_leaf pud_leaf
> #define pmd_none(pmd) (!pmd_val(pmd))
> #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD)
> #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK)
> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
> index 283f40d05a4d..8e7625a89922 100644
> --- a/arch/powerpc/include/asm/pgtable.h
> +++ b/arch/powerpc/include/asm/pgtable.h
> @@ -134,25 +134,25 @@ static inline void pte_frag_set(mm_context_t *ctx, void *p)
> }
> #endif
> 
> -#ifndef pmd_is_leaf
> -#define pmd_is_leaf pmd_is_leaf
> -static inline bool pmd_is_leaf(pmd_t pmd)
> +#ifndef pmd_leaf
> +#define pmd_leaf pmd_leaf
> +static inline bool pmd_leaf(pmd_t pmd)
> {
> return false;
> }
> #endif
> 
> -#ifndef pud_is_leaf
> -#define pud_is_leaf pud_is_leaf
> -static inline bool pud_is_leaf(pud_t pud)
> +#ifndef pud_leaf
> +#define pud_leaf pud_leaf
> +static inline bool pud_leaf(pud_t pud)
> {
> return false;
> }
> #endif
> 
> -#ifndef p4d_is_leaf
> -#define p4d_is_leaf p4d_is_leaf
> -static inline bool p4d_is_leaf(p4d_t p4d)
> +#ifndef p4d_leaf
> +#define p4d_leaf p4d_leaf
> +static inline bool p4d_leaf(p4d_t p4d)
> {
> return false;
> }
> diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
> index 5d5e12f3bf86..d29f8d1d97a6 100644
> --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
> +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
> @@ -497,7 +497,7 @@ static void kvmppc_unmap_free_pmd(struct kvm *kvm, pmd_t *pmd, bool full,
> for (im = 0; im < PTRS_PER_PMD; ++im, ++p) {
> if (!pmd_present(*p))
> continue;
> - if (pmd_is_leaf(*p)) {
> + if (pmd_leaf(*p)) {
> if (full) {
> pmd_clear(p);
> } else {
> @@ -526,7 +526,7 @@ static void kvmppc_unmap_free_pud(struct kvm *kvm, pud_t *pud,
> for (iu = 0; iu < PTRS_PER_PUD; ++iu, ++p) {
> if (!pud_present(*p))
> continue;
> - if (pud_is_leaf(*p)) {
> + if (pud_leaf(*p)) {
> pud_clear(p);
> } else {
> pmd_t *pmd;
> @@ -629,12 +629,12 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,
> new_pud = pud_alloc_one(kvm->mm, gpa);
> 
> pmd = NULL;
> - if (pud && pud_present(*pud) && !pud_is_leaf(*pud))
> + if (pud && pud_present(*pud) && !pud_leaf(*pud))
> pmd = pmd_offset(pud, gpa);
> else if (level <= 1)
> new_pmd = kvmppc_pmd_alloc();
> 
> - if (level == 0 && !(pmd && pmd_present(*pmd) && !pmd_is_leaf(*pmd)))
> + if (level == 0 && !(pmd && pmd_present(*pmd) && !pmd_leaf(*pmd)))
> new_ptep = kvmppc_pte_alloc();
> 
> /* Check if we might have been invalidated; let the guest retry if so */
> @@ -652,7 +652,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,
> new_pud = NULL;
> }
> pud = pud_offset(p4d, gpa);
> - if (pud_is_leaf(*pud)) {
> + if (pud_leaf(*pud)) {
> unsigned long hgpa = gpa & PUD_MASK;
> 
> /* Check if we raced and someone else has set the same thing */
> @@ -703,7 +703,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,
> new_pmd = NULL;
> }
> pmd = pmd_offset(pud, gpa);
> - if (pmd_is_leaf(*pmd)) {
> + if (pmd_leaf(*pmd)) {
> unsigned long lgpa = gpa & PMD_MASK;
> 
> /* Check if we raced and someone else has set the same thing */
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index cac727b01799..8ac27e031ff4 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -205,14 +205,14 @@ static void radix__change_memory_range(unsigned long start, unsigned long end,
> pudp = pud_alloc(&init_mm, p4dp, idx);
> if (!pudp)
> continue;
> - if (pud_is_leaf(*pudp)) {
> + if (pud_leaf(*pudp)) {
> ptep = (pte_t *)pudp;
> goto update_the_pte;
> }
> pmdp = pmd_alloc(&init_mm, pudp, idx);
> if (!pmdp)
> continue;
> - if (pmd_is_leaf(*pmdp)) {
> + if (pmd_leaf(*pmdp)) {
> ptep = pmdp_ptep(pmdp);
> goto update_the_pte;
> }
> @@ -762,7 +762,7 @@ static void __meminit remove_pmd_table(pmd_t *pmd_start, unsigned long addr,
> if (!pmd_present(*pmd))
> continue;
> 
> - if (pmd_is_leaf(*pmd)) {
> + if (pmd_leaf(*pmd)) {
> if (!IS_ALIGNED(addr, PMD_SIZE) ||
>    !IS_ALIGNED(next, PMD_SIZE)) {
> WARN_ONCE(1, "%s: unaligned range\n", __func__);
> @@ -792,7 +792,7 @@ static void __meminit remove_pud_table(pud_t *pud_start, unsigned long addr,
> if (!pud_present(*pud))
> continue;
> 
> - if (pud_is_leaf(*pud)) {
> + if (pud_leaf(*pud)) {
> if (!IS_ALIGNED(addr, PUD_SIZE) ||
>    !IS_ALIGNED(next, PUD_SIZE)) {
> WARN_ONCE(1, "%s: unaligned range\n", __func__);
> @@ -825,7 +825,7 @@ static void __meminit remove_pagetable(unsigned long start, unsigned long end)
> if (!p4d_present(*p4d))
> continue;
> 
> - if (p4d_is_leaf(*p4d)) {
> + if (p4d_leaf(*p4d)) {
> if (!IS_ALIGNED(addr, P4D_SIZE) ||
>    !IS_ALIGNED(next, P4D_SIZE)) {
> WARN_ONCE(1, "%s: unaligned range\n", __func__);
> @@ -1088,7 +1088,7 @@ int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
> 
> int pud_clear_huge(pud_t *pud)
> {
> - if (pud_is_leaf(*pud)) {
> + if (pud_leaf(*pud)) {
> pud_clear(pud);
> return 1;
> }
> @@ -1135,7 +1135,7 @@ int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
> 
> int pmd_clear_huge(pmd_t *pmd)
> {
> - if (pmd_is_leaf(*pmd)) {
> + if (pmd_leaf(*pmd)) {
> pmd_clear(pmd);
> return 1;
> }
> diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
> index cb2dcdb18f8e..35b9677b9553 100644
> --- a/arch/powerpc/mm/pgtable.c
> +++ b/arch/powerpc/mm/pgtable.c
> @@ -387,7 +387,7 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
> if (p4d_none(p4d))
> return NULL;
> 
> - if (p4d_is_leaf(p4d)) {
> + if (p4d_leaf(p4d)) {
> ret_pte = (pte_t *)p4dp;
> goto out;
> }
> @@ -409,7 +409,7 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
> if (pud_none(pud))
> return NULL;
> 
> - if (pud_is_leaf(pud)) {
> + if (pud_leaf(pud)) {
> ret_pte = (pte_t *)pudp;
> goto out;
> }
> @@ -448,7 +448,7 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
> goto out;
> }
> 
> - if (pmd_is_leaf(pmd)) {
> + if (pmd_leaf(pmd)) {
> ret_pte = (pte_t *)pmdp;
> goto out;
> }
> diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
> index 5ac1fd30341b..0604c80dae66 100644
> --- a/arch/powerpc/mm/pgtable_64.c
> +++ b/arch/powerpc/mm/pgtable_64.c
> @@ -100,7 +100,7 @@ EXPORT_SYMBOL(__pte_frag_size_shift);
> /* 4 level page table */
> struct page *p4d_page(p4d_t p4d)
> {
> - if (p4d_is_leaf(p4d)) {
> + if (p4d_leaf(p4d)) {
> if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
> VM_WARN_ON(!p4d_huge(p4d));
> return pte_page(p4d_pte(p4d));
> @@ -111,7 +111,7 @@ struct page *p4d_page(p4d_t p4d)
> 
> struct page *pud_page(pud_t pud)
> {
> - if (pud_is_leaf(pud)) {
> + if (pud_leaf(pud)) {
> if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
> VM_WARN_ON(!pud_huge(pud));
> return pte_page(pud_pte(pud));
> @@ -125,7 +125,7 @@ struct page *pud_page(pud_t pud)
>  */
> struct page *pmd_page(pmd_t pmd)
> {
> - if (pmd_is_leaf(pmd)) {
> + if (pmd_leaf(pmd)) {
> /*
> * vmalloc_to_page may be called on any vmap address (not only
> * vmalloc), and it uses pmd_page() etc., when huge vmap is
> diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
> index f51c882bf902..705c230dd4f5 100644
> --- a/arch/powerpc/xmon/xmon.c
> +++ b/arch/powerpc/xmon/xmon.c
> @@ -3342,7 +3342,7 @@ static void show_pte(unsigned long addr)
> return;
> }
> 
> - if (p4d_is_leaf(*p4dp)) {
> + if (p4d_leaf(*p4dp)) {
> format_pte(p4dp, p4d_val(*p4dp));
> return;
> }
> @@ -3356,7 +3356,7 @@ static void show_pte(unsigned long addr)
> return;
> }
> 
> - if (pud_is_leaf(*pudp)) {
> + if (pud_leaf(*pudp)) {
> format_pte(pudp, pud_val(*pudp));
> return;
> }
> @@ -3370,7 +3370,7 @@ static void show_pte(unsigned long addr)
> return;
> }
> 
> - if (pmd_is_leaf(*pmdp)) {
> + if (pmd_leaf(*pmdp)) {
> format_pte(pmdp, pmd_val(*pmdp));
> return;
> }
> -- 
> 2.34.1
> 

This should in fact be a v4. v3 available here:
Link: https://lore.kernel.org/all/cf3cf708786602bef0aade511356420ee387e0f9.camel@russell.cc/t/