From: Yeoreum Yun <yeoreum.yun@arm.com>
To: Ryan Roberts <ryan.roberts@arm.com>
Cc: catalin.marinas@arm.com, will@kernel.org,
akpm@linux-foundation.org, david@kernel.org,
kevin.brodsky@arm.com, quic_zhenhuah@quicinc.com,
dev.jain@arm.com, yang@os.amperecomputing.com,
chaitanyas.prakash@arm.com, bigeasy@linutronix.de,
clrkwllms@kernel.org, rostedt@goodmis.org,
lorenzo.stoakes@oracle.com, ardb@kernel.org, jackmanb@google.com,
vbabka@suse.cz, mhocko@suse.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev
Subject: Re: [PATCH v4 1/3] arm64: mmu: introduce pgtable_alloc_t
Date: Fri, 2 Jan 2026 16:16:51 +0000 [thread overview]
Message-ID: <aVfvc6U6jTaecyvm@e129823.arm.com> (raw)
In-Reply-To: <4a315d79-bf82-4a90-9c9c-8dd1bdc43d38@arm.com>
> On 02/01/2026 15:07, Yeoreum Yun wrote:
> > This is preparation patch to use preallocated page tables
> > for linear_map_split_to_ptes().
> >
> > Define pgtable_alloc_t type for callback used by create_XXX_mapping().
> >
> > Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
>
> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Thanks ;)
>
> > ---
> > arch/arm64/mm/mmu.c | 18 ++++++++++--------
> > 1 file changed, 10 insertions(+), 8 deletions(-)
> >
> > diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> > index 8e1d80a7033e..4b4908ae189b 100644
> > --- a/arch/arm64/mm/mmu.c
> > +++ b/arch/arm64/mm/mmu.c
> > @@ -74,6 +74,8 @@ EXPORT_SYMBOL(empty_zero_page);
> > static DEFINE_SPINLOCK(swapper_pgdir_lock);
> > static DEFINE_MUTEX(fixmap_lock);
> >
> > +typedef phys_addr_t (pgtable_alloc_t)(enum pgtable_type);
> > +
> > void noinstr set_swapper_pgd(pgd_t *pgdp, pgd_t pgd)
> > {
> > pgd_t *fixmap_pgdp;
> > @@ -197,7 +199,7 @@ static void init_pte(pte_t *ptep, unsigned long addr, unsigned long end,
> > static int alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
> > unsigned long end, phys_addr_t phys,
> > pgprot_t prot,
> > - phys_addr_t (*pgtable_alloc)(enum pgtable_type),
> > + pgtable_alloc_t pgtable_alloc,
> > int flags)
> > {
> > unsigned long next;
> > @@ -252,7 +254,7 @@ static int alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
> >
> > static int init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
> > phys_addr_t phys, pgprot_t prot,
> > - phys_addr_t (*pgtable_alloc)(enum pgtable_type), int flags)
> > + pgtable_alloc_t pgtable_alloc, int flags)
> > {
> > unsigned long next;
> >
> > @@ -292,7 +294,7 @@ static int init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
> > static int alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
> > unsigned long end, phys_addr_t phys,
> > pgprot_t prot,
> > - phys_addr_t (*pgtable_alloc)(enum pgtable_type),
> > + pgtable_alloc_t pgtable_alloc,
> > int flags)
> > {
> > int ret;
> > @@ -349,7 +351,7 @@ static int alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
> >
> > static int alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
> > phys_addr_t phys, pgprot_t prot,
> > - phys_addr_t (*pgtable_alloc)(enum pgtable_type),
> > + pgtable_alloc_t pgtable_alloc,
> > int flags)
> > {
> > int ret = 0;
> > @@ -415,7 +417,7 @@ static int alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
> >
> > static int alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
> > phys_addr_t phys, pgprot_t prot,
> > - phys_addr_t (*pgtable_alloc)(enum pgtable_type),
> > + pgtable_alloc_t pgtable_alloc,
> > int flags)
> > {
> > int ret;
> > @@ -467,7 +469,7 @@ static int alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
> > static int __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
> > unsigned long virt, phys_addr_t size,
> > pgprot_t prot,
> > - phys_addr_t (*pgtable_alloc)(enum pgtable_type),
> > + pgtable_alloc_t pgtable_alloc,
> > int flags)
> > {
> > int ret;
> > @@ -500,7 +502,7 @@ static int __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
> > static int __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
> > unsigned long virt, phys_addr_t size,
> > pgprot_t prot,
> > - phys_addr_t (*pgtable_alloc)(enum pgtable_type),
> > + pgtable_alloc_t pgtable_alloc,
> > int flags)
> > {
> > int ret;
> > @@ -516,7 +518,7 @@ static int __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
> > static void early_create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
> > unsigned long virt, phys_addr_t size,
> > pgprot_t prot,
> > - phys_addr_t (*pgtable_alloc)(enum pgtable_type),
> > + pgtable_alloc_t pgtable_alloc,
> > int flags)
> > {
> > int ret;
>
--
Sincerely,
Yeoreum Yun
next prev parent reply other threads:[~2026-01-02 16:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-02 15:07 [PATCH v4 0/3] fix wrong usage of memory allocation APIs under PREEMPT_RT in arm64 Yeoreum Yun
2026-01-02 15:07 ` [PATCH v4 1/3] arm64: mmu: introduce pgtable_alloc_t Yeoreum Yun
2026-01-02 15:28 ` Ryan Roberts
2026-01-02 16:16 ` Yeoreum Yun [this message]
2026-01-02 15:07 ` [PATCH v4 2/3] arm64: mmu: avoid allocating pages while splitting the linear mapping Yeoreum Yun
2026-01-02 15:44 ` Ryan Roberts
2026-01-02 16:14 ` Yeoreum Yun
2026-01-02 17:04 ` Ryan Roberts
2026-01-02 15:07 ` [PATCH v4 3/3] arm64: mmu: avoid allocating pages while installing ng-mapping for KPTI Yeoreum Yun
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