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| author | Reza Arbab | 2017-01-16 20:07:46 +0100 |
|---|---|---|
| committer | Michael Ellerman | 2017-01-31 03:54:20 +0100 |
| commit | 0d0a4bc2a6f7de19cb0256a55891955961d70b1c (patch) | |
| tree | 264459907cfc4dcafc916968264325f6a36cc440 /arch/powerpc/mm | |
| parent | powerpc/mm: add radix__remove_section_mapping() (diff) | |
| download | kernel-qcow2-linux-0d0a4bc2a6f7de19cb0256a55891955961d70b1c.tar.gz kernel-qcow2-linux-0d0a4bc2a6f7de19cb0256a55891955961d70b1c.tar.xz kernel-qcow2-linux-0d0a4bc2a6f7de19cb0256a55891955961d70b1c.zip | |
powerpc/mm: unstub radix__vmemmap_remove_mapping()
Use remove_pagetable() and friends for radix vmemmap removal.
We do not require the special-case handling of vmemmap done in the x86
versions of these functions. This is because vmemmap_free() has already
freed the mapped pages, and calls us with an aligned address range.
So, add a few failsafe WARNs, but otherwise the code to remove physical
mappings is already sufficient for vmemmap.
Signed-off-by: Reza Arbab <arbab@linux.vnet.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/pgtable-radix.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index aef9d49f70ce..30374586e01d 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -527,6 +527,15 @@ static void remove_pte_table(pte_t *pte_start, unsigned long addr, if (!pte_present(*pte)) continue; + if (!PAGE_ALIGNED(addr) || !PAGE_ALIGNED(next)) { + /* + * The vmemmap_free() and remove_section_mapping() + * codepaths call us with aligned addresses. + */ + WARN_ONCE(1, "%s: unaligned range\n", __func__); + continue; + } + pte_clear(&init_mm, addr, pte); } } @@ -546,6 +555,12 @@ static void remove_pmd_table(pmd_t *pmd_start, unsigned long addr, continue; if (pmd_huge(*pmd)) { + if (!IS_ALIGNED(addr, PMD_SIZE) || + !IS_ALIGNED(next, PMD_SIZE)) { + WARN_ONCE(1, "%s: unaligned range\n", __func__); + continue; + } + pte_clear(&init_mm, addr, (pte_t *)pmd); continue; } @@ -571,6 +586,12 @@ static void remove_pud_table(pud_t *pud_start, unsigned long addr, continue; if (pud_huge(*pud)) { + if (!IS_ALIGNED(addr, PUD_SIZE) || + !IS_ALIGNED(next, PUD_SIZE)) { + WARN_ONCE(1, "%s: unaligned range\n", __func__); + continue; + } + pte_clear(&init_mm, addr, (pte_t *)pud); continue; } @@ -597,6 +618,12 @@ static void remove_pagetable(unsigned long start, unsigned long end) continue; if (pgd_huge(*pgd)) { + if (!IS_ALIGNED(addr, PGDIR_SIZE) || + !IS_ALIGNED(next, PGDIR_SIZE)) { + WARN_ONCE(1, "%s: unaligned range\n", __func__); + continue; + } + pte_clear(&init_mm, addr, (pte_t *)pgd); continue; } @@ -636,7 +663,7 @@ int __meminit radix__vmemmap_create_mapping(unsigned long start, #ifdef CONFIG_MEMORY_HOTPLUG void radix__vmemmap_remove_mapping(unsigned long start, unsigned long page_size) { - /* FIXME!! intel does more. We should free page tables mapping vmemmap ? */ + remove_pagetable(start, start + page_size); } #endif #endif |