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mm: functions may simplify the use of return values

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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>
This commit is contained in:
Li kunyu 2022-05-12 20:23:07 -07:00 committed by Andrew Morton
parent 3fee229a8e
commit c8db8c2628
3 changed files with 6 additions and 16 deletions
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3
arch/x86/mm/pgtable.c
View File

@ -686,9 +686,8 @@ int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
*
* No 512GB pages yet -- always return 0
*/
int p4d_clear_huge(p4d_t *p4d)
void p4d_clear_huge(p4d_t *p4d)
{
return 0;
}
#endif

12
include/linux/pgtable.h
View File

@ -1448,16 +1448,13 @@ static inline int pmd_protnone(pmd_t pmd)
#ifndef __PAGETABLE_P4D_FOLDED
int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot);
int p4d_clear_huge(p4d_t *p4d);
void p4d_clear_huge(p4d_t *p4d);
#else
static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
{
return 0;
}
static inline int p4d_clear_huge(p4d_t *p4d)
{
return 0;
}
static inline void p4d_clear_huge(p4d_t *p4d) { }
#endif /* !__PAGETABLE_P4D_FOLDED */
int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
@ -1480,10 +1477,7 @@ static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
{
return 0;
}
static inline int p4d_clear_huge(p4d_t *p4d)
{
return 0;
}
static inline void p4d_clear_huge(p4d_t *p4d) { }
static inline int pud_clear_huge(pud_t *pud)
{
return 0;

7
mm/vmalloc.c
View File

@ -389,18 +389,15 @@ static void vunmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
{
p4d_t *p4d;
unsigned long next;
int cleared;
p4d = p4d_offset(pgd, addr);
do {
next = p4d_addr_end(addr, end);
cleared = p4d_clear_huge(p4d);
if (cleared || p4d_bad(*p4d))
p4d_clear_huge(p4d);
if (p4d_bad(*p4d))
*mask |= PGTBL_P4D_MODIFIED;
if (cleared)
continue;
if (p4d_none_or_clear_bad(p4d))
continue;
vunmap_pud_range(p4d, addr, next, mask);