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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2012-10-08 07:54:32 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-10-09 14:17:01 +0200 |
| commit | fc7e48aad35bf98c84cf21aed5c2f100c5ce009b (patch) | |
| tree | 1d33f49ac9705e1939cbe122d5aafb57aa7af07a /arch/s390/mm/vmem.c | |
| parent | c972cc60c23f5a6309292bfcc91a441743ba027e (diff) | |
| download | linux-fc7e48aad35bf98c84cf21aed5c2f100c5ce009b.tar.bz2 | |
s390/mm,vmem: fix vmem_add_mem()/vmem_remove_range()
vmem_add_mem() should only then insert a large page if pmd_none() is true
for the specific entry. We might have a leftover from a previous mapping.
In addition make vmem_remove_range()'s page table walk code more complete
and fix a couple of potential endless loops (which can never happen :).
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/vmem.c')
| -rw-r--r-- | arch/s390/mm/vmem.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index d402b19f1df2..387c7c60b5b8 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -109,8 +109,8 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro) pm_dir = pmd_offset(pu_dir, address); #if defined(CONFIG_64BIT) && !defined(CONFIG_DEBUG_PAGEALLOC) - if (MACHINE_HAS_EDAT1 && address && !(address & ~PMD_MASK) && - (address + PMD_SIZE <= end)) { + if (MACHINE_HAS_EDAT1 && pmd_none(*pm_dir) && address && + !(address & ~PMD_MASK) && (address + PMD_SIZE <= end)) { pte_val(pte) |= _SEGMENT_ENTRY_LARGE; pmd_val(*pm_dir) = pte_val(pte); address += PMD_SIZE; @@ -151,12 +151,20 @@ static void vmem_remove_range(unsigned long start, unsigned long size) pte_val(pte) = _PAGE_TYPE_EMPTY; while (address < end) { pg_dir = pgd_offset_k(address); + if (pgd_none(*pg_dir)) { + address += PGDIR_SIZE; + continue; + } pu_dir = pud_offset(pg_dir, address); - if (pud_none(*pu_dir)) + if (pud_none(*pu_dir)) { + address += PUD_SIZE; continue; + } pm_dir = pmd_offset(pu_dir, address); - if (pmd_none(*pm_dir)) + if (pmd_none(*pm_dir)) { + address += PMD_SIZE; continue; + } if (pmd_large(*pm_dir)) { pmd_clear(pm_dir); address += PMD_SIZE; |