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mm: recover pud_leaf() definitions in nopmd case

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This reverts one change in commit 924bd6a8c9 ("mm/x86: drop two
unnecessary pud_leaf() definitions").

One issue with that is it broke nopmd builds for at least both arm64 and
riscv (CONFIG_PGTABLE_LEVELS=2).  The other issue is it was overlooked that
it's a common change rather than x86 specific (relevant to the commit
message of the commit).

Normally there's no need for empty definition of pXd_leaf() because of the
fallback functions, however this logic may not apply to pgtable-nopmd.h,
because that's a header that can even be used by arch *pgtable.h headers,
which can use the *_leaf() definitions _before_ the fallback functions are
defined.  Leave it there to pass PGTABLE_LEVELS=2 builds.

Link: https://lkml.kernel.org/r/Ze8vFNV9YSdgC2S7@x1n
Fixes: 924bd6a8c9 ("mm/x86: drop two unnecessary pud_leaf() definitions")
Signed-off-by: Peter Xu <peterx@redhat.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202403090900.OwPqmRuI-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202403101607.a42gaLOS-lkp@intel.com/
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2024-03-11 12:10:45 -04:00 committed by Andrew Morton
parent 84d147df13
commit c087a5c324
1 changed files with 1 additions and 0 deletions
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include/asm-generic/pgtable-nopmd.h
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@ -31,6 +31,7 @@ static inline int pud_none(pud_t pud) { return 0; }
static inline int pud_bad(pud_t pud) { return 0; }
static inline int pud_present(pud_t pud) { return 1; }
static inline int pud_user(pud_t pud) { return 0; }
static inline int pud_leaf(pud_t pud) { return 0; }
static inline void pud_clear(pud_t *pud) { }
#define pmd_ERROR(pmd) (pud_ERROR((pmd).pud))