diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2026-01-16 13:09:28 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2026-01-16 13:09:28 -0800 |
| commit | 6782a30d20775bc03d516b0f56befc73f3893be8 (patch) | |
| tree | 5568725fc85deec0e0d7fa200d4fa642fcabfea2 /mm | |
| parent | d81585830017a896a1d6cfc1c626d7faaf9dfa55 (diff) | |
| parent | 8441c7d3bd6c5a52ab2ecf77e43a5bf262004f5c (diff) | |
Merge tag 'cxl-fixes-6.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
Pull Compute Express Link (CXL) fixes from Dave Jiang:
- Recognize all ZONE_DEVICE users as physaddr consumers
- Fix format string for extended_linear_cache_size_show()
- Fix target list setup for multiple decoders sharing the same
downstream port
- Restore HBIW check before derefernce platform data
- Fix potential infinite loop in __cxl_dpa_reserve()
- Check for invalid addresses returned from translation functions on
error
* tag 'cxl-fixes-6.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl:
cxl: Check for invalid addresses returned from translation functions on errors
cxl/hdm: Fix potential infinite loop in __cxl_dpa_reserve()
cxl/acpi: Restore HBIW check before dereferencing platform_data
cxl/port: Fix target list setup for multiple decoders sharing the same dport
cxl/region: fix format string for resource_size_t
x86/kaslr: Recognize all ZONE_DEVICE users as physaddr consumers
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Kconfig | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index bd0ea5454af8..a992f2203eb9 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1220,10 +1220,14 @@ config ZONE_DEVICE Device memory hotplug support allows for establishing pmem, or other device driver discovered memory regions, in the memmap. This allows pfn_to_page() lookups of otherwise - "device-physical" addresses which is needed for using a DAX - mapping in an O_DIRECT operation, among other things. - - If FS_DAX is enabled, then say Y. + "device-physical" addresses which is needed for DAX, PCI_P2PDMA, and + DEVICE_PRIVATE features among others. + + Enabling this option will reduce the entropy of x86 KASLR memory + regions. For example - on a 46 bit system, the entropy goes down + from 16 bits to 15 bits. The actual reduction in entropy depends + on the physical address bits, on processor features, kernel config + (5 level page table) and physical memory present on the system. # # Helpers to mirror range of the CPU page tables of a process into device page |