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mm: functions may simplify the use of return values
p4d_clear_huge may be optimized for void return type and function usage. vunmap_p4d_range function saves a few steps here. Link: https://lkml.kernel.org/r/20220507150630.90399-1-kunyu@nfschina.com Signed-off-by: Li kunyu <kunyu@nfschina.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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3fee229a8e
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c8db8c2628
3 changed files with 6 additions and 16 deletions
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@ -686,9 +686,8 @@ int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
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*
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* No 512GB pages yet -- always return 0
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*/
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int p4d_clear_huge(p4d_t *p4d)
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void p4d_clear_huge(p4d_t *p4d)
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{
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return 0;
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}
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#endif
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@ -1448,16 +1448,13 @@ static inline int pmd_protnone(pmd_t pmd)
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#ifndef __PAGETABLE_P4D_FOLDED
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int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot);
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int p4d_clear_huge(p4d_t *p4d);
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void p4d_clear_huge(p4d_t *p4d);
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#else
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static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
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{
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return 0;
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}
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static inline int p4d_clear_huge(p4d_t *p4d)
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{
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return 0;
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}
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static inline void p4d_clear_huge(p4d_t *p4d) { }
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#endif /* !__PAGETABLE_P4D_FOLDED */
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int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
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@ -1480,10 +1477,7 @@ static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
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{
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return 0;
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}
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static inline int p4d_clear_huge(p4d_t *p4d)
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{
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return 0;
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}
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static inline void p4d_clear_huge(p4d_t *p4d) { }
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static inline int pud_clear_huge(pud_t *pud)
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{
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return 0;
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@ -389,18 +389,15 @@ static void vunmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
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{
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p4d_t *p4d;
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unsigned long next;
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int cleared;
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p4d = p4d_offset(pgd, addr);
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do {
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next = p4d_addr_end(addr, end);
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cleared = p4d_clear_huge(p4d);
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if (cleared || p4d_bad(*p4d))
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p4d_clear_huge(p4d);
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if (p4d_bad(*p4d))
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*mask |= PGTBL_P4D_MODIFIED;
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if (cleared)
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continue;
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if (p4d_none_or_clear_bad(p4d))
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continue;
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vunmap_pud_range(p4d, addr, next, mask);
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