Release 4.14 arch/x86/mm/ident_map.c
// SPDX-License-Identifier: GPL-2.0
/*
* Helper routines for building identity mapping page tables. This is
* included by both the compressed kernel and the regular kernel.
*/
static void ident_pmd_init(struct x86_mapping_info *info, pmd_t *pmd_page,
unsigned long addr, unsigned long end)
{
addr &= PMD_MASK;
for (; addr < end; addr += PMD_SIZE) {
pmd_t *pmd = pmd_page + pmd_index(addr);
if (pmd_present(*pmd))
continue;
set_pmd(pmd, __pmd((addr - info->offset) | info->page_flag));
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Yinghai Lu | 66 | 82.50% | 1 | 33.33% |
| Rafael J. Wysocki | 13 | 16.25% | 1 | 33.33% |
| Xunlei Pang | 1 | 1.25% | 1 | 33.33% |
| Total | 80 | 100.00% | 3 | 100.00% |
static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,
unsigned long addr, unsigned long end)
{
unsigned long next;
for (; addr < end; addr = next) {
pud_t *pud = pud_page + pud_index(addr);
pmd_t *pmd;
next = (addr & PUD_MASK) + PUD_SIZE;
if (next > end)
next = end;
if (info->direct_gbpages) {
pud_t pudval;
if (pud_present(*pud))
continue;
addr &= PUD_MASK;
pudval = __pud((addr - info->offset) | info->page_flag);
set_pud(pud, pudval);
continue;
}
if (pud_present(*pud)) {
pmd = pmd_offset(pud, 0);
ident_pmd_init(info, pmd, addr, next);
continue;
}
pmd = (pmd_t *)info->alloc_pgt_page(info->context);
if (!pmd)
return -ENOMEM;
ident_pmd_init(info, pmd, addr, next);
set_pud(pud, __pud(__pa(pmd) | info->kernpg_flag));
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Yinghai Lu | 158 | 75.24% | 1 | 33.33% |
| Xunlei Pang | 49 | 23.33% | 1 | 33.33% |
| Tom Lendacky | 3 | 1.43% | 1 | 33.33% |
| Total | 210 | 100.00% | 3 | 100.00% |
static int ident_p4d_init(struct x86_mapping_info *info, p4d_t *p4d_page,
unsigned long addr, unsigned long end)
{
unsigned long next;
for (; addr < end; addr = next) {
p4d_t *p4d = p4d_page + p4d_index(addr);
pud_t *pud;
next = (addr & P4D_MASK) + P4D_SIZE;
if (next > end)
next = end;
if (p4d_present(*p4d)) {
pud = pud_offset(p4d, 0);
ident_pud_init(info, pud, addr, next);
continue;
}
pud = (pud_t *)info->alloc_pgt_page(info->context);
if (!pud)
return -ENOMEM;
ident_pud_init(info, pud, addr, next);
set_p4d(p4d, __p4d(__pa(pud) | info->kernpg_flag));
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kirill A. Shutemov | 158 | 98.14% | 1 | 50.00% |
| Tom Lendacky | 3 | 1.86% | 1 | 50.00% |
| Total | 161 | 100.00% | 2 | 100.00% |
int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
unsigned long pstart, unsigned long pend)
{
unsigned long addr = pstart + info->offset;
unsigned long end = pend + info->offset;
unsigned long next;
int result;
/* Set the default pagetable flags if not supplied */
if (!info->kernpg_flag)
info->kernpg_flag = _KERNPG_TABLE;
for (; addr < end; addr = next) {
pgd_t *pgd = pgd_page + pgd_index(addr);
p4d_t *p4d;
next = (addr & PGDIR_MASK) + PGDIR_SIZE;
if (next > end)
next = end;
if (pgd_present(*pgd)) {
p4d = p4d_offset(pgd, 0);
result = ident_p4d_init(info, p4d, addr, next);
if (result)
return result;
continue;
}
p4d = (p4d_t *)info->alloc_pgt_page(info->context);
if (!p4d)
return -ENOMEM;
result = ident_p4d_init(info, p4d, addr, next);
if (result)
return result;
if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
set_pgd(pgd, __pgd(__pa(p4d) | info->kernpg_flag));
} else {
/*
* With p4d folded, pgd is equal to p4d.
* The pgd entry has to point to the pud page table in this case.
*/
pud_t *pud = pud_offset(p4d, 0);
set_pgd(pgd, __pgd(__pa(pud) | info->kernpg_flag));
}
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Yinghai Lu | 165 | 64.45% | 1 | 25.00% |
| Kirill A. Shutemov | 49 | 19.14% | 1 | 25.00% |
| Rafael J. Wysocki | 22 | 8.59% | 1 | 25.00% |
| Tom Lendacky | 20 | 7.81% | 1 | 25.00% |
| Total | 256 | 100.00% | 4 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Yinghai Lu | 389 | 54.87% | 1 | 14.29% |
| Kirill A. Shutemov | 207 | 29.20% | 1 | 14.29% |
| Xunlei Pang | 50 | 7.05% | 1 | 14.29% |
| Rafael J. Wysocki | 35 | 4.94% | 1 | 14.29% |
| Tom Lendacky | 26 | 3.67% | 1 | 14.29% |
| Greg Kroah-Hartman | 1 | 0.14% | 1 | 14.29% |
| Kees Cook | 1 | 0.14% | 1 | 14.29% |
| Total | 709 | 100.00% | 7 | 100.00% |
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