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OpenCloudOS-Kernel
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x86, cleanups: Use clear_page/copy_page rather than memset/memcpy 

When operating on whole pages, use clear_page() and copy_page() in
favor of memset() and memcpy(); after all that's what they are
intended for.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
LKML-Reference: <4C7FB8CA0200007800013F51@vpn.id2.novell.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Jan Beulich 2010-09-02 13:46:34 +01:00 committed by H. Peter Anvin
parent 0f1cf415f0
commit 234bb549ee
4 changed files with 6 additions and 7 deletions
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4
arch/x86/kernel/machine_kexec_64.c
View File

@ -36,7 +36,7 @@ static int init_one_level2_page(struct kimage *image, pgd_t *pgd,
if (!page)
goto out;
pud = (pud_t *)page_address(page);
memset(pud, 0, PAGE_SIZE);
clear_page(pud);
set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
}
pud = pud_offset(pgd, addr);
@ -45,7 +45,7 @@ static int init_one_level2_page(struct kimage *image, pgd_t *pgd,
if (!page)
goto out;
pmd = (pmd_t *)page_address(page);
memset(pmd, 0, PAGE_SIZE);
clear_page(pmd);
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
}
pmd = pmd_offset(pud, addr);

3
arch/x86/kvm/lapic.c
View File

@ -1056,14 +1056,13 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
vcpu->arch.apic = apic;
apic->regs_page = alloc_page(GFP_KERNEL);
apic->regs_page = alloc_page(GFP_KERNEL|__GFP_ZERO);
if (apic->regs_page == NULL) {
printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
vcpu->vcpu_id);
goto nomem_free_apic;
}
apic->regs = page_address(apic->regs_page);
memset(apic->regs, 0, PAGE_SIZE);
apic->vcpu = vcpu;
hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,

4
arch/x86/mm/init_32.c
View File

@ -67,7 +67,7 @@ static __init void *alloc_low_page(void)
panic("alloc_low_page: ran out of memory");
adr = __va(pfn * PAGE_SIZE);
memset(adr, 0, PAGE_SIZE);
clear_page(adr);
return adr;
}
@ -558,7 +558,7 @@ char swsusp_pg_dir[PAGE_SIZE]
static inline void save_pg_dir(void)
{
memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE);
copy_page(swsusp_pg_dir, swapper_pg_dir);
}
#else /* !CONFIG_ACPI_SLEEP */
static inline void save_pg_dir(void)

2
arch/x86/mm/init_64.c
View File

@ -293,7 +293,7 @@ static __ref void *alloc_low_page(unsigned long *phys)
panic("alloc_low_page: ran out of memory");
adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
memset(adr, 0, PAGE_SIZE);
clear_page(adr);
*phys = pfn * PAGE_SIZE;
return adr;
}