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| author | imp <imp@FreeBSD.org> | 2015-06-02 21:36:45 +0000 |
|---|---|---|
| committer | imp <imp@FreeBSD.org> | 2015-06-02 21:36:45 +0000 |
| commit | 44bead40e54f48b541aa36e35eba7e34fb5bb4e1 (patch) | |
| tree | a7c0508f4bf08e60bd29768aa59aec22cc2bb8df /sys/arm | |
| parent | a5587d67f9f8ac5971f073fdfbf4cb0e69fc2bd7 (diff) | |
| download | FreeBSD-src-44bead40e54f48b541aa36e35eba7e34fb5bb4e1.zip FreeBSD-src-44bead40e54f48b541aa36e35eba7e34fb5bb4e1.tar.gz | |
MFC:
r283014: Disable unmapped I/O: it is broken for unaligned pages
r283126: Fix comments
Diffstat (limited to 'sys/arm')
| -rw-r--r-- | sys/arm/arm/pmap.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/arm/arm/pmap.c b/sys/arm/arm/pmap.c index f438816..2b41d7c 100644 --- a/sys/arm/arm/pmap.c +++ b/sys/arm/arm/pmap.c @@ -4324,7 +4324,13 @@ pmap_copy_page(vm_page_t src, vm_page_t dst) pmap_copy_page_func(VM_PAGE_TO_PHYS(src), VM_PAGE_TO_PHYS(dst)); } -int unmapped_buf_allowed = 1; +/* + * We have code to do unmapped I/O. However, it isn't quite right and + * causes un-page-aligned I/O to devices to fail (most notably newfs + * or fsck). We give up a little performance to not allow unmapped I/O + * to gain stability. + */ +int unmapped_buf_allowed = 0; void pmap_copy_pages(vm_page_t ma[], vm_offset_t a_offset, vm_page_t mb[], |
