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- A single improvement to check ident_pud_init()'s return value (Arvind Sankar)

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Merge tag 'x86_mm_for_v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 mm update from Borislav Petkov:
 "A single improvement to check ident_pud_init()'s return value (Arvind
  Sankar)"

* tag 'x86_mm_for_v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm/ident_map: Check for errors from ident_pud_init()
This commit is contained in:
Linus Torvalds 2020-12-14 13:31:31 -08:00
commit 54d794830f
1 changed files with 10 additions and 2 deletions
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12
arch/x86/mm/ident_map.c
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@ -62,6 +62,7 @@ static int ident_p4d_init(struct x86_mapping_info *info, p4d_t *p4d_page,
unsigned long addr, unsigned long end)
{
unsigned long next;
int result;
for (; addr < end; addr = next) {
p4d_t *p4d = p4d_page + p4d_index(addr);
@ -73,13 +74,20 @@ static int ident_p4d_init(struct x86_mapping_info *info, p4d_t *p4d_page,
if (p4d_present(*p4d)) {
pud = pud_offset(p4d, 0);
ident_pud_init(info, pud, addr, next);
result = ident_pud_init(info, pud, addr, next);
if (result)
return result;
continue;
}
pud = (pud_t *)info->alloc_pgt_page(info->context);
if (!pud)
return -ENOMEM;
ident_pud_init(info, pud, addr, next);
result = ident_pud_init(info, pud, addr, next);
if (result)
return result;
set_p4d(p4d, __p4d(__pa(pud) | info->kernpg_flag));
}