Linus,
please pull the latest x86/urgent branch from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-2022-05-15
up to: 280abe14b6e0: x86/mm: Fix marking of unused sub-pmd ranges
A single fix for the handling of unpopulated sub-pmd spaces. The copy &
pasta from the corresponding s390 code screwed up the address calculation
for marking the sub-pmd ranges via memset by omitting the ALIGN_DOWN() to
calculate the proper start address. It's a mystery why this code is not
generic and shared because there is nothing architecture specific in there,
but that's too intrusive for a backportable fix.
Thanks,
tglx
------------------>
Adrian-Ken Rueegsegger (1):
x86/mm: Fix marking of unused sub-pmd ranges
arch/x86/mm/init_64.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 96d34ebb20a9..e2942335d143 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -902,6 +902,8 @@ static void __meminit vmemmap_use_sub_pmd(unsigned long start, unsigned long end
static void __meminit vmemmap_use_new_sub_pmd(unsigned long start, unsigned long end)
{
+ const unsigned long page = ALIGN_DOWN(start, PMD_SIZE);
+
vmemmap_flush_unused_pmd();
/*
@@ -914,8 +916,7 @@ static void __meminit vmemmap_use_new_sub_pmd(unsigned long start, unsigned long
* Mark with PAGE_UNUSED the unused parts of the new memmap range
*/
if (!IS_ALIGNED(start, PMD_SIZE))
- memset((void *)start, PAGE_UNUSED,
- start - ALIGN_DOWN(start, PMD_SIZE));
+ memset((void *)page, PAGE_UNUSED, start - page);
/*
* We want to avoid memset(PAGE_UNUSED) when populating the vmemmap of
The pull request you sent on Sun, 15 May 2022 11:25:08 +0200 (CEST):
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-2022-05-15
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/79dc4fc2f235159f0f59fca2250855a796f590ff
Thank you!
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