arm64: mm: Remove pmd_sect() and pud_sect()

Browse source

The semantics of pXd_leaf() are very similar to pXd_sect(). The only
difference is that pXd_sect() only considers it a section if PTE_VALID
is set, whereas pXd_leaf() permits both "valid" and "present-invalid"
types.

Using pXd_sect() has caused issues now that large leaf entries can be
present-invalid since commit a166563e7e ("arm64: mm: support large
block mapping when rodata=full"), so let's just remove the API and
standardize on pXd_leaf().

There are a few callsites of the form pXd_leaf(READ_ONCE(*pXdp)). This
was previously fine for the pXd_sect() macro because it only evaluated
its argument once. But pXd_leaf() evaluates its argument multiple times.
So let's avoid unintended side effects by reimplementing pXd_leaf() as
an inline function.

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

...

This commit is contained in:

Ryan Roberts 2026-03-30 17:17:04 +01:00 • committed by Catalin Marinas

parent 15bfba1ad7

commit 1d37713fa8

2 changed files with 21 additions and 16 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

19

arch/arm64/include/asm/pgtable.h

View file

18

arch/arm64/mm/mmu.c

View file