From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Kevin Brodsky <kevin.brodsky@arm.com>, linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
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Subject: Re: [PATCH 04/22] mm: use mm_is_kernel() in generic page table code
Date: Tue, 21 Jul 2026 17:07:22 +0200 [thread overview]
Message-ID: <0d75daa4-a034-4094-bce5-57938d294163@kernel.org> (raw)
In-Reply-To: <02565237-d777-4c63-8b17-817df59feac4@arm.com>
On 7/16/26 11:35, Kevin Brodsky wrote:
> On 14/07/2026 16:03, Kevin Brodsky wrote:
>> diff --git a/mm/memory.c b/mm/memory.c
>> index d5e87624f692..c0244c0b0756 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -3394,13 +3394,13 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
>> spinlock_t *ptl;
>>
>> if (create) {
>> - mapped_pte = pte = (mm == &init_mm) ?
>> + mapped_pte = pte = mm_is_kernel(mm) ?
>> pte_alloc_kernel_track(pmd, addr, mask) :
>> pte_alloc_map_lock(mm, pmd, addr, &ptl);
>
> As noted by Sashiko, this is a little problematic because if
> apply_to_page_range() is called on efi_mm, then we will end up with
> __pte_alloc_kernel() taking the init_mm lock, since that's hardcoded.
>
> That probably means we should pass the mm to __pte_alloc_kernel().
Agreed.
I guess we have to audit all existing init_mm usage?
--
Cheers,
David
next prev parent reply other threads:[~2026-07-21 15:07 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-14 14:03 [PATCH 00/22] Simplify special kernel page table handling Kevin Brodsky
2026-07-14 14:03 ` [PATCH 01/22] mm: drop unused __mm_flags_set_mask_bits_word() Kevin Brodsky
2026-07-21 14:57 ` David Hildenbrand (Arm)
2026-07-14 14:03 ` [PATCH 02/22] mm: move mm_flags helpers to mm_types.h Kevin Brodsky
2026-07-21 14:57 ` David Hildenbrand (Arm)
2026-07-14 14:03 ` [PATCH 03/22] mm: introduce MMF_KERNEL flag and set it for init_mm Kevin Brodsky
2026-07-14 14:47 ` Dave Hansen
2026-07-14 15:04 ` Lorenzo Stoakes (ARM)
2026-07-16 9:33 ` Kevin Brodsky
2026-07-21 15:04 ` David Hildenbrand (Arm)
2026-07-14 14:03 ` [PATCH 04/22] mm: use mm_is_kernel() in generic page table code Kevin Brodsky
2026-07-16 9:35 ` Kevin Brodsky
2026-07-21 15:07 ` David Hildenbrand (Arm) [this message]
2026-07-14 14:03 ` [PATCH 05/22] arm64: mm: use mm_is_kernel() for kernel mm checks Kevin Brodsky
2026-07-14 14:03 ` [PATCH 06/22] loongarch: mm: use mm_is_kernel() in switch_mm_irqs_off() Kevin Brodsky
2026-07-14 14:03 ` [PATCH 07/22] parisc: mm: use mm_is_kernel() for kernel mm checks Kevin Brodsky
2026-07-14 14:03 ` [PATCH 08/22] powerpc: " Kevin Brodsky
2026-07-14 14:03 ` [PATCH 09/22] s390: " Kevin Brodsky
2026-07-14 14:03 ` [PATCH 10/22] sparc: " Kevin Brodsky
2026-07-14 14:04 ` [PATCH 11/22] um: mm: use mm_is_kernel() in TLB sync Kevin Brodsky
2026-07-14 14:04 ` [PATCH 12/22] x86/mm: use mm_is_kernel() for kernel mm checks Kevin Brodsky
2026-07-14 15:09 ` Dave Hansen
2026-07-14 14:04 ` [PATCH 13/22] mm: account page table pages when allocated Kevin Brodsky
2026-07-14 14:04 ` [PATCH 14/22] mm: set page table page type " Kevin Brodsky
2026-07-14 15:16 ` Vishal Moola
2026-07-16 9:49 ` Kevin Brodsky
2026-07-20 19:05 ` Vishal Moola
2026-07-14 14:04 ` [PATCH 15/22] mm: only initialise pt_share_count for user pgtables Kevin Brodsky
2026-07-21 15:12 ` David Hildenbrand (Arm)
2026-07-14 14:04 ` [PATCH 16/22] efi: mark efi_mm as a kernel mm Kevin Brodsky
2026-07-14 14:04 ` [PATCH 17/22] mm: pagewalk: drop redundant address check for kernel mm walks Kevin Brodsky
2026-07-16 10:24 ` Kevin Brodsky
2026-07-14 14:04 ` [PATCH 18/22] arm64: mm: drop explicit mm_is_efi() check in contpte Kevin Brodsky
2026-07-14 14:04 ` [PATCH 19/22] x86/tboot: mark tboot_mm as a kernel mm Kevin Brodsky
2026-07-14 15:19 ` Dave Hansen
2026-07-14 14:04 ` [PATCH 20/22] arm64: mm: drop ctor/dtor calls for kernel page tables Kevin Brodsky
2026-07-14 14:04 ` [PATCH 21/22] arm: mm: drop ctor call " Kevin Brodsky
2026-07-14 14:04 ` [PATCH 22/22] riscv: mm: drop ctor/dtor calls " Kevin Brodsky
2026-07-15 15:07 ` [PATCH 00/22] Simplify special kernel page table handling Kevin Brodsky
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