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mm: remove obsolete pgd_offset_gate()

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Remove pgd_offset_gate() completely and simply make the single caller use
pgd_offset().

It appears that the gate area resides in the kernel-mapped segment
exclusively on IA64.  Therefore, removing pgd_offset_k is safe since IA64
is now obsolete.

Link: https://lkml.kernel.org/r/tencent_503130C3CD56569191396268CF4D12F09A06@qq.com
Signed-off-by: Feng Lee <379943137@qq.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: bibo mao <maobibo@loongson.cn>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Feng Lee 2025-05-09 14:32:30 +08:00 • committed by Andrew Morton
parent 3c06ee7c24
commit 0cad6736f4
2 changed files with 1 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/pgtable.h
View file

@ -1164,10 +1164,6 @@ static inline void arch_swap_restore(swp_entry_t entry, struct folio *folio)
}
#endif
#ifndef __HAVE_ARCH_PGD_OFFSET_GATE
#define pgd_offset_gate(mm, addr) pgd_offset(mm, addr)
#endif
#ifndef __HAVE_ARCH_MOVE_PTE
#define move_pte(pte, old_addr, new_addr) (pte)
#endif

5
mm/gup.c
View file

@ -1102,10 +1102,7 @@ static int get_gate_page(struct mm_struct *mm, unsigned long address,
/* user gate pages are read-only */
if (gup_flags & FOLL_WRITE)
return -EFAULT;
if (address > TASK_SIZE)
pgd = pgd_offset_k(address);
else
pgd = pgd_offset_gate(mm, address);
pgd = pgd_offset(mm, address);
if (pgd_none(*pgd))
return -EFAULT;
p4d = p4d_offset(pgd, address);