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xen: one cleanup for 4.17-rc4

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Merge tag 'for-linus-4.17-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen cleanup from Juergen Gross:
 "One cleanup to remove VLAs from the kernel"

* tag 'for-linus-4.17-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  x86/xen: Remove use of VLAs
This commit is contained in:
Linus Torvalds 2018-05-04 05:47:21 -10:00
commit 625e2001e9
1 changed files with 31 additions and 55 deletions
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48
arch/x86/xen/enlighten_pv.c
View file

@ -421,24 +421,15 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
{
unsigned long va = dtr->address;
unsigned int size = dtr->size + 1;
unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
unsigned long frames[pages];
int f;
/*
* A GDT can be up to 64k in size, which corresponds to 8192
* 8-byte entries, or 16 4k pages..
*/
BUG_ON(size > 65536);
BUG_ON(va & ~PAGE_MASK);
for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
unsigned long pfn, mfn;
int level;
pte_t *ptep;
unsigned long pfn, mfn;
void *virt;
/* @size should be at most GDT_SIZE which is smaller than PAGE_SIZE. */
BUG_ON(size > PAGE_SIZE);
BUG_ON(va & ~PAGE_MASK);
/*
* The GDT is per-cpu and is in the percpu data area.
* That can be virtually mapped, so we need to do a
@ -453,13 +444,10 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
mfn = pfn_to_mfn(pfn);
virt = __va(PFN_PHYS(pfn));
frames[f] = mfn;
make_lowmem_page_readonly((void *)va);
make_lowmem_page_readonly(virt);
}
if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
if (HYPERVISOR_set_gdt(&mfn, size / sizeof(struct desc_struct)))
BUG();
}
@ -470,21 +458,12 @@ static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
{
unsigned long va = dtr->address;
unsigned int size = dtr->size + 1;
unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
unsigned long frames[pages];
int f;
/*
* A GDT can be up to 64k in size, which corresponds to 8192
* 8-byte entries, or 16 4k pages..
*/
BUG_ON(size > 65536);
BUG_ON(va & ~PAGE_MASK);
for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
pte_t pte;
unsigned long pfn, mfn;
pte_t pte;
/* @size should be at most GDT_SIZE which is smaller than PAGE_SIZE. */
BUG_ON(size > PAGE_SIZE);
BUG_ON(va & ~PAGE_MASK);
pfn = virt_to_pfn(va);
mfn = pfn_to_mfn(pfn);
@ -494,10 +473,7 @@ static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0))
BUG();
frames[f] = mfn;
}
if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
if (HYPERVISOR_set_gdt(&mfn, size / sizeof(struct desc_struct)))
BUG();
}