If SHARED_KERNEL_PMD is false, then we need to allocate and initialize the kernel pmd. We can easily piggy-back this onto the existing pmd prepopulation code.
Signed-off-by: Jeremy Fitzhardinge <[EMAIL PROTECTED]> --- arch/x86/mm/pgtable_32.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c --- a/arch/x86/mm/pgtable_32.c +++ b/arch/x86/mm/pgtable_32.c @@ -269,7 +269,7 @@ static void pgd_mop_up_pmds(pgd_t *pgdp) { int i; - for(i = 0; i < USER_PTRS_PER_PGD; i++) { + for(i = 0; i < UNSHARED_PTRS_PER_PGD; i++) { pgd_t pgd = pgdp[i]; if (pgd_val(pgd) != 0) { @@ -289,6 +289,10 @@ static void pgd_mop_up_pmds(pgd_t *pgdp) * processor notices the update. Since this is expensive, and * all 4 top-level entries are used almost immediately in a * new process's life, we just pre-populate them here. + * + * Also, if we're in a paravirt environment where the kernel pmd is + * not shared between pagetables (!SHARED_KERNEL_PMDS), we allocate + * and initialize the kernel pmds here. */ static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd) { @@ -297,13 +301,18 @@ static int pgd_prepopulate_pmd(struct mm int i; pud = pud_offset(pgd, 0); - for (addr = i = 0; i < USER_PTRS_PER_PGD; i++, pud++, addr += PUD_SIZE) { + for (addr = i = 0; i < UNSHARED_PTRS_PER_PGD; + i++, pud++, addr += PUD_SIZE) { pmd_t *pmd = pmd_alloc_one(mm, addr); if (!pmd) { pgd_mop_up_pmds(pgd); return 0; } + + if (i >= USER_PTRS_PER_PGD) + memcpy(pmd, (pmd_t *)pgd_page_vaddr(swapper_pg_dir[i]), + sizeof(pmd_t) * PTRS_PER_PMD); pud_populate(mm, pud, pmd); } @@ -346,4 +355,3 @@ void check_pgt_cache(void) { quicklist_trim(0, pgd_dtor, 25, 16); } - -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/