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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
This commit is contained in:
Juergen Gross 2020-08-15 12:06:41 +02:00 committed by Ingo Molnar
parent e1ac3e66d3
commit 7c9f80cb76
1 changed files with 6 additions and 6 deletions
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12
arch/x86/include/asm/paravirt.h
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@ -448,7 +448,7 @@ static inline pudval_t pud_val(pud_t pud)
static inline void pud_clear(pud_t *pudp)
{
set_pud(pudp, __pud(0));
set_pud(pudp, native_make_pud(0));
}
static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
@ -485,15 +485,15 @@ static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd)
} while (0)
#define pgd_clear(pgdp) do { \
if (pgtable_l5_enabled()) \
set_pgd(pgdp, __pgd(0)); \
if (pgtable_l5_enabled()) \
set_pgd(pgdp, native_make_pgd(0)); \
} while (0)
#endif /* CONFIG_PGTABLE_LEVELS == 5 */
static inline void p4d_clear(p4d_t *p4dp)
{
set_p4d(p4dp, __p4d(0));
set_p4d(p4dp, native_make_p4d(0));
}
static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
@ -504,12 +504,12 @@ static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
set_pte(ptep, __pte(0));
set_pte(ptep, native_make_pte(0));
}
static inline void pmd_clear(pmd_t *pmdp)
{
set_pmd(pmdp, __pmd(0));
set_pmd(pmdp, native_make_pmd(0));
}
#define __HAVE_ARCH_START_CONTEXT_SWITCH