diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-05-15 06:42:40 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-05-15 06:42:40 -0700 |
| commit | 79dc4fc2f235159f0f59fca2250855a796f590ff (patch) | |
| tree | 25d7b574b35e5a7bee26a16ee908f6d2e5a569c7 | |
| parent | 990e798d182a63afba6cc990f5bcd42d18436b55 (diff) | |
| parent | 280abe14b6e0a38de9cc86fe6a019523aadd8f70 (diff) | |
Merge tag 'x86-urgent-2022-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Thomas Gleixner:
"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"
* tag 'x86-urgent-2022-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mm: Fix marking of unused sub-pmd ranges
| -rw-r--r-- | arch/x86/mm/init_64.c | 5 |
1 files 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 |