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x86/mm: Convert arch_sync_kernel_mappings() to ptdescs

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Convert arch_sync_kernel_mappings() to ptdescs in preparation for
the eventual splitting of ptdescs from struct page.

Following this patch, we can successfully boot a 32-bit x86 kernel with
separately allocated ptdescs.

Signed-off-by: Vishal Moola <vishal.moola@gmail.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: William Kucharski <william.kucharski@linux.dev>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Link: https://patch.msgid.link/20260629185742.126987-5-vishal.moola@gmail.com
This commit is contained in:
Vishal Moola 2026-06-29 11:57:37 -07:00 committed by Dave Hansen
parent 5fcb2abffe
commit 46ee485bb9
1 changed files with 4 additions and 4 deletions
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8
arch/x86/mm/fault.c
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@ -275,17 +275,17 @@ void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
for (addr = start & PMD_MASK;
addr >= TASK_SIZE_MAX && addr < VMALLOC_END;
addr += PMD_SIZE) {
struct page *page;
struct ptdesc *ptdesc;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
list_for_each_entry(ptdesc, &pgd_list, pt_list) {
spinlock_t *pgt_lock;
/* the pgt_lock only for Xen */
pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
pgt_lock = &pgd_page_get_mm(ptdesc_page(ptdesc))->page_table_lock;
spin_lock(pgt_lock);
vmalloc_sync_one(page_address(page), addr);
vmalloc_sync_one(ptdesc_address(ptdesc), addr);
spin_unlock(pgt_lock);
}
spin_unlock(&pgd_lock);