From 44bead40e54f48b541aa36e35eba7e34fb5bb4e1 Mon Sep 17 00:00:00 2001 From: imp Date: Tue, 2 Jun 2015 21:36:45 +0000 Subject: [PATCH] MFC: r283014: Disable unmapped I/O: it is broken for unaligned pages r283126: Fix comments --- sys/arm/arm/pmap.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/sys/arm/arm/pmap.c b/sys/arm/arm/pmap.c index f438816da34d..2b41d7ca786a 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[],