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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-07 17:25:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-07 17:25:29 -0700 |
| commit | 52e0ad262cd76696e8cd8510944b0bfdc0c140a9 (patch) | |
| tree | e0f682e6b9ae98bea38fd578954f2e325418fcef /mm/Kconfig | |
| parent | Merge tag 'pinctrl-v5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl (diff) | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc (diff) | |
| download | linux-dev-52e0ad262cd76696e8cd8510944b0bfdc0c140a9.tar.xz linux-dev-52e0ad262cd76696e8cd8510944b0bfdc0c140a9.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next
Pull sparc updates from David Miller:
- Rework the sparc32 page tables so that READ_ONCE(*pmd), as done by
generic code, operates on a word sized element. From Will Deacon.
- Some scnprintf() conversions, from Chen Zhou.
- A pin_user_pages() conversion from John Hubbard.
- Several 32-bit ptrace register handling fixes and such from Al Viro.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next:
fix a braino in "sparc32: fix register window handling in genregs32_[gs]et()"
sparc32: mm: Only call ctor()/dtor() functions for first and last user
sparc32: mm: Disable SPLIT_PTLOCK_CPUS
sparc32: mm: Don't try to free page-table pages if ctor() fails
sparc32: register memory occupied by kernel as memblock.memory
sparc: remove unused header file nfs_fs.h
sparc32: fix register window handling in genregs32_[gs]et()
sparc64: fix misuses of access_process_vm() in genregs32_[sg]et()
oradax: convert get_user_pages() --> pin_user_pages()
sparc: use scnprintf() in show_pciobppath_attr() in vio.c
sparc: use scnprintf() in show_pciobppath_attr() in pci.c
tty: vcc: Fix error return code in vcc_probe()
sparc32: mm: Reduce allocation size for PMD and PTE tables
sparc32: mm: Change pgtable_t type to pte_t * instead of struct page *
sparc32: mm: Restructure sparc32 MMU page-table layout
sparc32: mm: Fix argument checking in __srmmu_get_nocache()
sparc64: Replace zero-length array with flexible-array
sparc: mm: return true,false in kern_addr_valid()
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index cffc276fa19c..f2104cc0d35c 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -193,6 +193,9 @@ config MEMORY_HOTREMOVE # Default to 4 for wider testing, though 8 might be more appropriate. # ARM's adjust_pte (unused if VIPT) depends on mm-wide page_table_lock. # PA-RISC 7xxx's spinlock_t would enlarge struct page from 32 to 44 bytes. +# SPARC32 allocates multiple pte tables within a single page, and therefore +# a per-page lock leads to problems when multiple tables need to be locked +# at the same time (e.g. copy_page_range()). # DEBUG_SPINLOCK and DEBUG_LOCK_ALLOC spinlock_t also enlarge struct page. # config SPLIT_PTLOCK_CPUS @@ -200,6 +203,7 @@ config SPLIT_PTLOCK_CPUS default "999999" if !MMU default "999999" if ARM && !CPU_CACHE_VIPT default "999999" if PARISC && !PA20 + default "999999" if SPARC32 default "4" config ARCH_ENABLE_SPLIT_PMD_PTLOCK |