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mm/debug_vm_pgtable: fix build failure with powerpc 8xx

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Since commit 9e343b467c ("READ_ONCE: Enforce atomicity for
{READ,WRITE}_ONCE() memory accesses"), READ_ONCE() cannot be used
anymore to read complex page table entries.

This leads to:

      CC      mm/debug_vm_pgtable.o
    In file included from ./include/asm-generic/bug.h:5,
                     from ./arch/powerpc/include/asm/bug.h:109,
                     from ./include/linux/bug.h:5,
                     from ./include/linux/mmdebug.h:5,
                     from ./include/linux/gfp.h:5,
                     from mm/debug_vm_pgtable.c:13:
    In function 'pte_clear_tests',
        inlined from 'debug_vm_pgtable' at mm/debug_vm_pgtable.c:363:2:
    ./include/linux/compiler.h:392:38: error: Unsupported access size for {READ,WRITE}_ONCE().
    mm/debug_vm_pgtable.c:249:14: note: in expansion of macro 'READ_ONCE'
      249 |  pte_t pte = READ_ONCE(*ptep);
          |              ^~~~~~~~~
    make[2]: *** [mm/debug_vm_pgtable.o] Error 1

Fix it by using the recently added ptep_get() helper.

Link: http://lkml.kernel.org/r/6ca8c972e6c920dc4ae0d4affbed9703afa4d010.1592490570.git.christophe.leroy@csgroup.eu
Fixes: 9e343b467c ("READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christophe Leroy 2020-06-25 20:30:04 -07:00 committed by Linus Torvalds
parent 7f70c2a68a
commit 9449c9cb42
1 changed files with 2 additions and 2 deletions
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4
mm/debug_vm_pgtable.c
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@ -246,13 +246,13 @@ static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep,
unsigned long vaddr)
{
pte_t pte = READ_ONCE(*ptep);
pte_t pte = ptep_get(ptep);
pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
set_pte_at(mm, vaddr, ptep, pte);
barrier();
pte_clear(mm, vaddr, ptep);
pte = READ_ONCE(*ptep);
pte = ptep_get(ptep);
WARN_ON(!pte_none(pte));
}