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-rw-r--r--mm/Kconfig4
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