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powerpc: Remove find_current_mm_pte()

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Last usage of find_current_mm_pte() was removed by
commit 15759cb054ef ("powerpc/perf/callchain: Use
__get_user_pages_fast in read_user_stack_slow")

Remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ec79f462a3bfa8365b7df505e574d5d85246bc68.1646818177.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-03-09 10:29:50 +01:00 committed by Michael Ellerman
parent 5836947613
commit e75d07bd83
2 changed files with 2 additions and 27 deletions
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25
arch/powerpc/include/asm/pte-walk.h
View File

@ -60,29 +60,4 @@ static inline phys_addr_t ppc_find_vmap_phys(unsigned long addr)
return pa;
}
/*
* This is what we should always use. Any other lockless page table lookup needs
* careful audit against THP split.
*/
static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hshift)
{
pte_t *pte;
VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
VM_WARN(pgdir != current->mm->pgd,
"%s lock less page table lookup called on wrong mm\n", __func__);
pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
#if defined(CONFIG_DEBUG_VM) && \
!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
/*
* We should not find huge page if these configs are not enabled.
*/
if (hshift)
WARN_ON(*hshift);
#endif
return pte;
}
#endif /* _ASM_POWERPC_PTE_WALK_H */

4
arch/powerpc/mm/book3s64/pgtable.c
View File

@ -100,14 +100,14 @@ static void do_serialize(void *arg)
}
/*
* Serialize against find_current_mm_pte which does lock-less
* Serialize against __find_linux_pte() which does lock-less
* lookup in page tables with local interrupts disabled. For huge pages
* it casts pmd_t to pte_t. Since format of pte_t is different from
* pmd_t we want to prevent transit from pmd pointing to page table
* to pmd pointing to huge page (and back) while interrupts are disabled.
* We clear pmd to possibly replace it with page table pointer in
* different code paths. So make sure we wait for the parallel
* find_current_mm_pte to finish.
* __find_linux_pte() to finish.
*/
void serialize_against_pte_lookup(struct mm_struct *mm)
{