[Xen-changelog] [mini-os master] mini-os: correct first free pfn

[patchbot@xxxxxxx]

commit cc52fbe9ab5f1042c514f8b148069725ecaece8b
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue Jul 12 13:43:54 2016 +0200
Commit:     Juergen Gross <jgross@xxxxxxxx>
CommitDate: Thu Aug 11 13:03:43 2016 +0200

    mini-os: correct first free pfn
    
    The first free pfn available for allocation is calculated by adding the
    number of page table frames to the pfn of the first page table and
    then the magic number 3 to account for start info page et al.
    
    As the start info page, xenstore page and console page are allocated
    _before_ the page tables leaving room for these pages behind the page
    tables makes no sense.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
---
 arch/x86/mm.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm.c b/arch/x86/mm.c
index 51aa966..ae1036e 100644
--- a/arch/x86/mm.c
+++ b/arch/x86/mm.c
@@ -867,9 +867,8 @@ void arch_init_mm(unsigned long* start_pfn_p, unsigned 
long* max_pfn_p)
     printk("stack start: %p(VA)\n", stack);
     printk("       _end: %p(VA)\n", &_end);
 
-    /* First page follows page table pages and 3 more pages (store page etc) */
-    start_pfn = PFN_UP(to_phys(start_info.pt_base)) + 
-        start_info.nr_pt_frames + 3;
+    /* First page follows page table pages. */
+    start_pfn = PFN_UP(to_phys(start_info.pt_base)) + start_info.nr_pt_frames;
     max_pfn = start_info.nr_pages;
 
     /* We need room for demand mapping and heap, clip available memory */
--
generated by git-patchbot for /home/xen/git/mini-os.git#master

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
https://lists.xenproject.org/xen-changelog