linux-sg2042/drivers/android
Minchan Kim 3013bf62b6 binder: reduce mmap_sem write-side lock
binder has used write-side mmap_sem semaphore to release memory
mapped at address space of the process. However, right lock to
release pages is down_read, not down_write because page table lock
already protects the race for parallel freeing.

Please do not use mmap_sem write-side lock which is well known
contented lock.

Cc: Todd Kjos <tkjos@google.com>
Cc: Martijn Coenen <maco@android.com>
Cc: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-19 14:50:11 +01:00
..
Kconfig binder: add functions to copy to/from binder buffers 2019-02-12 10:43:57 +01:00
Makefile binder: implement binderfs 2018-12-19 09:40:13 +01:00
binder.c binder: fix handling of misaligned binder object 2019-02-15 08:49:20 +01:00
binder_alloc.c binder: reduce mmap_sem write-side lock 2019-02-19 14:50:11 +01:00
binder_alloc.h binder: use userspace pointer as base of buffer space 2019-02-12 10:43:57 +01:00
binder_alloc_selftest.c binder: fix sparse issue in binder_alloc_selftest.c 2019-02-14 08:13:56 +01:00
binder_internal.h binderfs: remove separate device_initcall() 2019-02-01 15:50:26 +01:00
binder_trace.h binder: use userspace pointer as base of buffer space 2019-02-12 10:43:57 +01:00
binderfs.c binderfs: remove separate device_initcall() 2019-02-01 15:50:26 +01:00