cregit-Linux how code gets into the kernel

Release 4.11 arch/x86/include/asm/pgalloc.h

#ifndef _ASM_X86_PGALLOC_H

#define _ASM_X86_PGALLOC_H

#include <linux/threads.h>
#include <linux/mm.h>		/* for struct page */
#include <linux/pagemap.h>


static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }

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Jeremy Fitzhardinge15100.00%1100.00%
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#ifdef CONFIG_PARAVIRT #include <asm/paravirt.h> #else #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}

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Jeremy Fitzhardinge15100.00%1100.00%
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static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}

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Jeremy Fitzhardinge15100.00%3100.00%
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static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}

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Jeremy Fitzhardinge15100.00%3100.00%
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static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count) {}

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Jeremy Fitzhardinge22100.00%3100.00%
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static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}

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Jeremy Fitzhardinge15100.00%2100.00%
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static inline void paravirt_release_pte(unsigned long pfn) {}

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Jeremy Fitzhardinge10100.00%3100.00%
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static inline void paravirt_release_pmd(unsigned long pfn) {}

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Jeremy Fitzhardinge10100.00%3100.00%
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static inline void paravirt_release_pud(unsigned long pfn) {}

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Jeremy Fitzhardinge10100.00%2100.00%
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#endif /* * Flags to use when allocating a user page table page. */ extern gfp_t __userpte_alloc_gfp; /* * Allocate and free page tables. */ extern pgd_t *pgd_alloc(struct mm_struct *); extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long); extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long); /* Should really implement gc for free page table pages. This could be done with a reference count in struct page. */
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) { BUG_ON((unsigned long)pte & (PAGE_SIZE-1)); free_page((unsigned long)pte); }

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Jeremy Fitzhardinge40100.00%1100.00%
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static inline void pte_free(struct mm_struct *mm, struct page *pte) { pgtable_page_dtor(pte); __free_page(pte); }

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Jeremy Fitzhardinge2281.48%150.00%
Peter Zijlstra518.52%150.00%
Total27100.00%2100.00%

extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte, unsigned long address) { ___pte_free_tlb(tlb, pte); }

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Benjamin Herrenschmidt28100.00%1100.00%
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static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) { paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); }

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Jeremy Fitzhardinge47100.00%2100.00%
Total47100.00%2100.00%


static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte) { unsigned long pfn = page_to_pfn(pte); paravirt_alloc_pte(mm, pfn); set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE)); }

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Jeremy Fitzhardinge56100.00%2100.00%
Total56100.00%2100.00%

#define pmd_pgtable(pmd) pmd_page(pmd) #if CONFIG_PGTABLE_LEVELS > 2
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) { struct page *page; gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO; if (mm == &init_mm) gfp &= ~__GFP_ACCOUNT; page = alloc_pages(gfp, 0); if (!page) return NULL; if (!pgtable_pmd_page_ctor(page)) { __free_pages(page, 0); return NULL; } return (pmd_t *)page_address(page); }

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Kirill A. Shutemov4348.86%133.33%
Jeremy Fitzhardinge2528.41%133.33%
Vladimir Davydov2022.73%133.33%
Total88100.00%3100.00%


static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) { BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); pgtable_pmd_page_dtor(virt_to_page(pmd)); free_page((unsigned long)pmd); }

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Jeremy Fitzhardinge4083.33%150.00%
Kirill A. Shutemov816.67%150.00%
Total48100.00%2100.00%

extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, unsigned long address) { ___pmd_free_tlb(tlb, pmd); }

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Benjamin Herrenschmidt2696.30%150.00%
Uwe Kleine-König13.70%150.00%
Total27100.00%2100.00%

#ifdef CONFIG_X86_PAE extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); #else /* !CONFIG_X86_PAE */
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) { paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))); }

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Jeremy Fitzhardinge47100.00%2100.00%
Total47100.00%2100.00%

#endif /* CONFIG_X86_PAE */ #if CONFIG_PGTABLE_LEVELS > 3
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) { paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud))); }

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Jeremy Fitzhardinge47100.00%2100.00%
Total47100.00%2100.00%


static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) { gfp_t gfp = GFP_KERNEL_ACCOUNT; if (mm == &init_mm) gfp &= ~__GFP_ACCOUNT; return (pud_t *)get_zeroed_page(gfp); }

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Jeremy Fitzhardinge2659.09%150.00%
Vladimir Davydov1840.91%150.00%
Total44100.00%2100.00%


static inline void pud_free(struct mm_struct *mm, pud_t *pud) { BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); free_page((unsigned long)pud); }

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Jeremy Fitzhardinge40100.00%1100.00%
Total40100.00%1100.00%

extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, unsigned long address) { ___pud_free_tlb(tlb, pud); }

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Benjamin Herrenschmidt27100.00%1100.00%
Total27100.00%1100.00%

#endif /* CONFIG_PGTABLE_LEVELS > 3 */ #endif /* CONFIG_PGTABLE_LEVELS > 2 */ #endif /* _ASM_X86_PGALLOC_H */

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Jeremy Fitzhardinge68177.56%950.00%
Benjamin Herrenschmidt849.57%15.56%
Kirill A. Shutemov556.26%211.11%
Vladimir Davydov384.33%15.56%
Thomas Gleixner60.68%15.56%
Peter Zijlstra50.57%15.56%
Ian Campbell50.57%15.56%
H. Peter Anvin30.34%15.56%
Uwe Kleine-König10.11%15.56%
Total878100.00%18100.00%
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