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x86/paravirt: Avoid needless paravirt step clearing page table entries
pte_clear() et al are based on two paravirt steps today: one step to create a page table entry with all zeroes, and one step to write this entry value. Drop the first step as it is completely useless. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200815100641.26362-7-jgross@suse.com
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1 changed files with 6 additions and 6 deletions
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@ -448,7 +448,7 @@ static inline pudval_t pud_val(pud_t pud)
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static inline void pud_clear(pud_t *pudp)
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{
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set_pud(pudp, __pud(0));
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set_pud(pudp, native_make_pud(0));
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}
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static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
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@ -485,15 +485,15 @@ static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd)
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} while (0)
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#define pgd_clear(pgdp) do { \
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if (pgtable_l5_enabled()) \
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set_pgd(pgdp, __pgd(0)); \
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if (pgtable_l5_enabled()) \
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set_pgd(pgdp, native_make_pgd(0)); \
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} while (0)
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#endif /* CONFIG_PGTABLE_LEVELS == 5 */
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static inline void p4d_clear(p4d_t *p4dp)
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{
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set_p4d(p4dp, __p4d(0));
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set_p4d(p4dp, native_make_p4d(0));
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}
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static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
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@ -504,12 +504,12 @@ static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
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static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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set_pte(ptep, __pte(0));
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set_pte(ptep, native_make_pte(0));
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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set_pmd(pmdp, __pmd(0));
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set_pmd(pmdp, native_make_pmd(0));
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}
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#define __HAVE_ARCH_START_CONTEXT_SWITCH
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