diff options
Diffstat (limited to 'arch/x86/kernel/setup.c')
| -rw-r--r-- | arch/x86/kernel/setup.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index fc0fe743f3a1..635185ba4435 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -293,10 +293,32 @@ static void __init init_gbpages(void) else direct_gbpages = 0; } + +static void __init cleanup_highmap_brk_end(void) +{ + pud_t *pud; + pmd_t *pmd; + + mmu_cr4_features = read_cr4(); + + /* + * _brk_end cannot change anymore, but it and _end may be + * located on different 2M pages. cleanup_highmap(), however, + * can only consider _end when it runs, so destroy any + * mappings beyond _brk_end here. + */ + pud = pud_offset(pgd_offset_k(_brk_end), _brk_end); + pmd = pmd_offset(pud, _brk_end - 1); + while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1)) + pmd_clear(pmd); +} #else static inline void init_gbpages(void) { } +static inline void cleanup_highmap_brk_end(void) +{ +} #endif static void __init reserve_brk(void) @@ -307,6 +329,8 @@ static void __init reserve_brk(void) /* Mark brk area as locked down and no longer taking any new allocations */ _brk_start = 0; + + cleanup_highmap_brk_end(); } #ifdef CONFIG_BLK_DEV_INITRD |