Changeset 9aed144 in mainline for kernel/arch/arm32/include/mach/testarm/testarm.h

Timestamp:

2011-11-25T23:35:22Z (14 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

1c01e6c

Parents:

50177dcd

Message:

Finish transition to lock-free page_mapping_find() in TLB miss handlers.

• Simply drop the calls to page_table_lock/unlock() in ia64 and sparc64 TLB miss handlers.

As for why this is possible:

• page_mapping_find() cannot race with page_table_remove() because page_mapping_find() is called only when interrupts are disabled, which prevents TLB shootdown from starting, which in turn prevents page_table_remove() from running

• page_mapping_insert() will not negatively interfere with page_mapping_find() because page_mapping_insert() adds a fully initialized pte_t to the end of the hash bucket

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