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ecd60532e0
Booting a ColdFire m68k core with MMU enabled causes a "bad page state"
oops since commit 1d40a5ea01 ("mm: mark pages in use for page tables"):
BUG: Bad page state in process sh pfn:01ce2
page:004fefc8 count:0 mapcount:-1024 mapping:00000000 index:0x0
flags: 0x0()
raw: 00000000 00000000 00000000 fffffbff 00000000 00000100 00000200 00000000
raw: 039c4000
page dumped because: nonzero mapcount
Modules linked in:
CPU: 0 PID: 22 Comm: sh Not tainted 4.17.0-07461-g1d40a5ea01d5 #13
Fix by calling pgtable_page_dtor() in our __pte_free_tlb() code path,
so that the PG_table flag is cleared before we free the pte page.
Note that I had to change the type of pte_free() to be static from
extern. Otherwise you get a lot of warnings like this:
./arch/m68k/include/asm/mcf_pgalloc.h:80:2: warning: ‘pgtable_page_dtor’ is static but used in inline function ‘pte_free’ which is not static
pgtable_page_dtor(page);
^
And making it static is consistent with our use of this in the other
m68k pgalloc definitions of pte_free().
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
CC: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef M68K_MCF_PGALLOC_H
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#define M68K_MCF_PGALLOC_H
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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free_page((unsigned long) pte);
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}
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extern const char bad_pmd_string[];
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extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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unsigned long page = __get_free_page(GFP_DMA);
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if (!page)
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return NULL;
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memset((void *)page, 0, PAGE_SIZE);
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return (pte_t *) (page);
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}
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extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
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{
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return (pmd_t *) pgd;
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}
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#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
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#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
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#define pte_alloc_one_fast(mm, addr) pte_alloc_one(mm, addr)
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#define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
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(unsigned long)(page_address(page)))
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#define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
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#define pmd_pgtable(pmd) pmd_page(pmd)
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static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
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unsigned long address)
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{
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pgtable_page_dtor(page);
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__free_page(page);
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}
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#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
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static inline struct page *pte_alloc_one(struct mm_struct *mm,
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unsigned long address)
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{
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struct page *page = alloc_pages(GFP_DMA, 0);
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pte_t *pte;
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if (!page)
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return NULL;
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if (!pgtable_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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pte = kmap(page);
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if (pte) {
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clear_page(pte);
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__flush_page_to_ram(pte);
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flush_tlb_kernel_page(pte);
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nocache_page(pte);
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}
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kunmap(page);
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return page;
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}
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static inline void pte_free(struct mm_struct *mm, struct page *page)
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{
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pgtable_page_dtor(page);
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__free_page(page);
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}
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/*
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* In our implementation, each pgd entry contains 1 pmd that is never allocated
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* or freed. pgd_present is always 1, so this should never be called. -NL
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*/
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#define pmd_free(mm, pmd) BUG()
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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free_page((unsigned long) pgd);
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}
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *new_pgd;
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new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
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if (!new_pgd)
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return NULL;
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memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
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memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
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return new_pgd;
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}
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#define pgd_populate(mm, pmd, pte) BUG()
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#endif /* M68K_MCF_PGALLOC_H */
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