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asm-generic: Prepare for riscv use of pud_alloc_one and pud_free

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In the following commits, riscv will almost use the generic versions of
pud_alloc_one and pud_free but an additional check is required since those
functions are only relevant when using at least a 4-level page table, which
will be determined at runtime on riscv.

So move the content of those functions into other functions that riscv
can use without duplicating code.

Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2021-12-06 11:46:50 +01:00 committed by Palmer Dabbelt
parent 3270bfdb9e
commit 60639f74c2
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 18 additions and 6 deletions
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24
include/asm-generic/pgalloc.h
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@ -147,6 +147,15 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
#if CONFIG_PGTABLE_LEVELS > 3
static inline pud_t *__pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
gfp_t gfp = GFP_PGTABLE_USER;
if (mm == &init_mm)
gfp = GFP_PGTABLE_KERNEL;
return (pud_t *)get_zeroed_page(gfp);
}
#ifndef __HAVE_ARCH_PUD_ALLOC_ONE
/**
* pud_alloc_one - allocate a page for PUD-level page table
@ -159,20 +168,23 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
*/
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
gfp_t gfp = GFP_PGTABLE_USER;
if (mm == &init_mm)
gfp = GFP_PGTABLE_KERNEL;
return (pud_t *)get_zeroed_page(gfp);
return __pud_alloc_one(mm, addr);
}
#endif
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
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);
}
#ifndef __HAVE_ARCH_PUD_FREE
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
__pud_free(mm, pud);
}
#endif
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#ifndef __HAVE_ARCH_PGD_FREE