3184cc4b6f
As seen below, allthough the init sections have been freed, the associated memory area is still marked as executable in the page tables. ~ dmesg [ 5.860093] Freeing unused kernel memory: 592K (c0570000 - c0604000) ~ cat /sys/kernel/debug/kernel_page_tables ---[ Start of kernel VM ]--- 0xc0000000-0xc0497fff 4704K rw X present dirty accessed shared 0xc0498000-0xc056ffff 864K rw present dirty accessed shared 0xc0570000-0xc059ffff 192K rw X present dirty accessed shared 0xc05a0000-0xc7ffffff 125312K rw present dirty accessed shared ---[ vmalloc() Area ]--- This patch fixes that. The implementation is done by reusing the change_page_attr() function implemented for CONFIG_DEBUG_PAGEALLOC Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
#ifndef _ASM_POWERPC_PGTABLE_H
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#define _ASM_POWERPC_PGTABLE_H
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#ifndef __ASSEMBLY__
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#include <linux/mmdebug.h>
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#include <linux/mmzone.h>
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#include <asm/processor.h> /* For TASK_SIZE */
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#include <asm/mmu.h>
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#include <asm/page.h>
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struct mm_struct;
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#endif /* !__ASSEMBLY__ */
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#ifdef CONFIG_PPC_BOOK3S
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#include <asm/book3s/pgtable.h>
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#else
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#include <asm/nohash/pgtable.h>
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#endif /* !CONFIG_PPC_BOOK3S */
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#ifndef __ASSEMBLY__
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#include <asm/tlbflush.h>
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/* Keep these as a macros to avoid include dependency mess */
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern unsigned long empty_zero_page[];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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extern pgd_t swapper_pg_dir[];
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void limit_zone_pfn(enum zone_type zone, unsigned long max_pfn);
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int dma_pfn_limit_to_zone(u64 pfn_limit);
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extern void paging_init(void);
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/*
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* kern_addr_valid is intended to indicate whether an address is a valid
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* kernel address. Most 32-bit archs define it as always true (like this)
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* but most 64-bit archs actually perform a test. What should we do here?
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*/
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#define kern_addr_valid(addr) (1)
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#include <asm-generic/pgtable.h>
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/*
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* This gets called at the end of handling a page fault, when
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* the kernel has put a new PTE into the page table for the process.
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* We use it to ensure coherency between the i-cache and d-cache
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* for the page which has just been mapped in.
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* On machines which use an MMU hash table, we use this to put a
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* corresponding HPTE into the hash table ahead of time, instead of
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* waiting for the inevitable extra hash-table miss exception.
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*/
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extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *);
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extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
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unsigned long end, int write,
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struct page **pages, int *nr);
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#ifndef CONFIG_TRANSPARENT_HUGEPAGE
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#define pmd_large(pmd) 0
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#endif
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pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *shift);
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static inline pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *shift)
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{
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VM_WARN(!arch_irqs_disabled(),
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"%s called with irq enabled\n", __func__);
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return __find_linux_pte_or_hugepte(pgdir, ea, is_thp, shift);
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}
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unsigned long vmalloc_to_phys(void *vmalloc_addr);
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void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
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void pgtable_cache_init(void);
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#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
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void mark_initmem_nx(void);
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#else
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static inline void mark_initmem_nx(void) { }
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_POWERPC_PGTABLE_H */
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