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| author | zhichang.yuan <zhichang.yuan@linaro.org> | 2014-12-09 10:26:47 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-01-28 15:07:28 +0300 |
| commit | 523d6e9fae9333a0e2a7baf4d11c8bcca544790e (patch) | |
| tree | 3c0d9fc243f9e00ce49985e078a8c641029f0833 /arch/arm64/mm | |
| parent | 62fa5e20bd73385253d2b8d3a51f80d1e6d2e1c6 (diff) | |
| download | linux-523d6e9fae9333a0e2a7baf4d11c8bcca544790e.tar.xz | |
arm64:mm: free the useless initial page table
For 64K page system, after mapping a PMD section, the corresponding initial
page table is not needed any more. That page can be freed.
Signed-off-by: Zhichang Yuan <zhichang.yuan@linaro.org>
[catalin.marinas@arm.com: added BUG_ON() to catch late memblock freeing]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/mm')
| -rw-r--r-- | arch/arm64/mm/mmu.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 155cbb0a74b6..eb293febfb56 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -153,8 +153,14 @@ static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud, * Check for previous table entries created during * boot (__create_page_tables) and flush them. */ - if (!pmd_none(old_pmd)) + if (!pmd_none(old_pmd)) { flush_tlb_all(); + if (pmd_table(old_pmd)) { + phys_addr_t table = __pa(pte_offset_map(&old_pmd, 0)); + BUG_ON(alloc != early_alloc); + memblock_free(table, PAGE_SIZE); + } + } } else { alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), prot, alloc); @@ -209,9 +215,12 @@ static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, * Look up the old pmd table and free it. */ if (!pud_none(old_pud)) { - phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); - memblock_free(table, PAGE_SIZE); flush_tlb_all(); + if (pud_table(old_pud)) { + phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); + BUG_ON(alloc != early_alloc); + memblock_free(table, PAGE_SIZE); + } } } else { alloc_init_pmd(mm, pud, addr, next, phys, prot, alloc); |