Date: Tue, 2 Jun 2015 21:36:45 +0000 (UTC) From: Warner Losh <imp@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r283931 - stable/10/sys/arm/arm Message-ID: <201506022136.t52LajY7067576@svn.freebsd.org>
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Author: imp Date: Tue Jun 2 21:36:45 2015 New Revision: 283931 URL: https://svnweb.freebsd.org/changeset/base/283931 Log: MFC: r283014: Disable unmapped I/O: it is broken for unaligned pages r283126: Fix comments Modified: stable/10/sys/arm/arm/pmap.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/arm/arm/pmap.c ============================================================================== --- stable/10/sys/arm/arm/pmap.c Tue Jun 2 21:24:47 2015 (r283930) +++ stable/10/sys/arm/arm/pmap.c Tue Jun 2 21:36:45 2015 (r283931) @@ -4324,7 +4324,13 @@ pmap_copy_page(vm_page_t src, vm_page_t 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[],
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