Commit-ID: 55920d31f1e3fea06702c74271dd56c4fc9b70ca
Gitweb: http://git.kernel.org/tip/55920d31f1e3fea06702c74271dd56c4fc9b70ca
Author: Andy Lutomirski <[email protected]>
AuthorDate: Sat, 23 Jul 2016 09:59:28 -0700
Committer: Ingo Molnar <[email protected]>
CommitDate: Sat, 23 Jul 2016 21:17:10 +0200
x86/mm/cpa: Add missing comment in populate_pdg()
In commit:
21cbc2822aa1 ("x86/mm/cpa: Unbreak populate_pgd(): stop trying to deallocate
failed PUDs")
I intended to add this comment, but I failed at using git.
Signed-off-by: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link:
http://lkml.kernel.org/r/242baf8612394f4e31216f96d13c4d2e9b90d1b7.1469293159.git.l...@kernel.org
Signed-off-by: Ingo Molnar <[email protected]>
---
arch/x86/mm/pageattr.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 2bc6ea1..47870a5 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1091,6 +1091,11 @@ static int populate_pgd(struct cpa_data *cpa, unsigned
long addr)
ret = populate_pud(cpa, addr, pgd_entry, pgprot);
if (ret < 0) {
+ /*
+ * Leave the PUD page in place in case some other CPU or thread
+ * already found it, but remove any useless entries we just
+ * added to it.
+ */
unmap_pud_range(pgd_entry, addr,
addr + (cpa->numpages << PAGE_SHIFT));
return ret;
