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Message-ID: <Z304QRzGgg/0HI6L@li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com>
Date: Tue, 7 Jan 2025 15:20:49 +0100
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Qi Zheng <zhengqi.arch@...edance.com>
Cc: peterz@...radead.org, kevin.brodsky@....com, palmer@...belt.com,
tglx@...utronix.de, david@...hat.com, jannh@...gle.com,
hughd@...gle.com, yuzhao@...gle.com, willy@...radead.org,
muchun.song@...ux.dev, vbabka@...nel.org, lorenzo.stoakes@...cle.com,
akpm@...ux-foundation.org, rientjes@...gle.com, vishal.moola@...il.com,
arnd@...db.de, will@...nel.org, aneesh.kumar@...nel.org,
npiggin@...il.com, dave.hansen@...ux.intel.com, rppt@...nel.org,
ryan.roberts@....com, linux-mm@...ck.org,
linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
x86@...nel.org, linux-arch@...r.kernel.org, linux-csky@...r.kernel.org,
linux-hexagon@...r.kernel.org, loongarch@...ts.linux.dev,
linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
linux-openrisc@...r.kernel.org, linux-sh@...r.kernel.org,
linux-um@...ts.infradead.org
Subject: Re: [PATCH v4 13/15] mm: pgtable: introduce generic
__tlb_remove_table()
On Mon, Dec 30, 2024 at 05:07:48PM +0800, Qi Zheng wrote:
> Several architectures (arm, arm64, riscv and x86) define exactly the
> same __tlb_remove_table(), just introduce generic __tlb_remove_table() to
> eliminate these duplications.
>
> The s390 __tlb_remove_table() is nearly the same, so also make s390
> __tlb_remove_table() version generic.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> ---
> arch/arm/include/asm/tlb.h | 9 ---------
> arch/arm64/include/asm/tlb.h | 7 -------
> arch/powerpc/include/asm/tlb.h | 1 +
> arch/riscv/include/asm/tlb.h | 12 ------------
> arch/s390/include/asm/tlb.h | 9 ++++-----
> arch/s390/mm/pgalloc.c | 7 -------
> arch/sparc/include/asm/tlb_32.h | 1 +
> arch/sparc/include/asm/tlb_64.h | 1 +
> arch/x86/include/asm/tlb.h | 17 -----------------
> include/asm-generic/tlb.h | 15 +++++++++++++--
> 10 files changed, 20 insertions(+), 59 deletions(-)
...
> diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
> index 79df7c0932c56..da4a7d175f69c 100644
> --- a/arch/s390/include/asm/tlb.h
> +++ b/arch/s390/include/asm/tlb.h
> @@ -22,7 +22,6 @@
> * Pages used for the page tables is a different story. FIXME: more
> */
>
> -void __tlb_remove_table(void *_table);
> static inline void tlb_flush(struct mmu_gather *tlb);
> static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
> struct page *page, bool delay_rmap, int page_size);
> @@ -87,7 +86,7 @@ static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
> tlb->cleared_pmds = 1;
> if (mm_alloc_pgste(tlb->mm))
> gmap_unlink(tlb->mm, (unsigned long *)pte, address);
> - tlb_remove_ptdesc(tlb, pte);
> + tlb_remove_ptdesc(tlb, virt_to_ptdesc(pte));
> }
>
> /*
> @@ -106,7 +105,7 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
> tlb->mm->context.flush_mm = 1;
> tlb->freed_tables = 1;
> tlb->cleared_puds = 1;
> - tlb_remove_ptdesc(tlb, pmd);
> + tlb_remove_ptdesc(tlb, virt_to_ptdesc(pmd));
> }
>
> /*
> @@ -124,7 +123,7 @@ static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
> tlb->mm->context.flush_mm = 1;
> tlb->freed_tables = 1;
> tlb->cleared_p4ds = 1;
> - tlb_remove_ptdesc(tlb, pud);
> + tlb_remove_ptdesc(tlb, virt_to_ptdesc(pud));
> }
>
> /*
> @@ -142,7 +141,7 @@ static inline void p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
> __tlb_adjust_range(tlb, address, PAGE_SIZE);
> tlb->mm->context.flush_mm = 1;
> tlb->freed_tables = 1;
> - tlb_remove_ptdesc(tlb, p4d);
> + tlb_remove_ptdesc(tlb, virt_to_ptdesc(p4d));
> }
>
> #endif /* _S390_TLB_H */
> diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c
> index c73b89811a264..3e002dea6278f 100644
> --- a/arch/s390/mm/pgalloc.c
> +++ b/arch/s390/mm/pgalloc.c
> @@ -193,13 +193,6 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
> pagetable_dtor_free(ptdesc);
> }
>
> -void __tlb_remove_table(void *table)
> -{
> - struct ptdesc *ptdesc = virt_to_ptdesc(table);
> -
> - pagetable_dtor_free(ptdesc);
> -}
> -
> #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> static void pte_free_now(struct rcu_head *head)
> {
...
> diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
> index 709830274b756..69de47c7ef3c5 100644
> --- a/include/asm-generic/tlb.h
> +++ b/include/asm-generic/tlb.h
> @@ -153,8 +153,9 @@
> *
> * Useful if your architecture has non-page page directories.
> *
> - * When used, an architecture is expected to provide __tlb_remove_table()
> - * which does the actual freeing of these pages.
> + * When used, an architecture is expected to provide __tlb_remove_table() or
> + * use the generic __tlb_remove_table(), which does the actual freeing of these
> + * pages.
> *
> * MMU_GATHER_RCU_TABLE_FREE
> *
> @@ -207,6 +208,16 @@ struct mmu_table_batch {
> #define MAX_TABLE_BATCH \
> ((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *))
>
> +#ifndef __HAVE_ARCH_TLB_REMOVE_TABLE
> +static inline void __tlb_remove_table(void *table)
> +{
> + struct ptdesc *ptdesc = (struct ptdesc *)table;
> +
> + pagetable_dtor(ptdesc);
> + pagetable_free(ptdesc);
> +}
> +#endif
> +
> extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
>
> #else /* !CONFIG_MMU_GATHER_HAVE_TABLE_FREE */
For s390:
Acked-by: Alexander Gordeev <agordeev@...ux.ibm.com>
Thanks!
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