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由 Kirill Tkhai 提交于
Similar to __down_write_killable(), add read killable primitive: extract current __down_read() code to macros and teach it to get different functions as slow_path argument: store ax register to ret, and add sp register and preserve its value. Add call_rwsem_down_read_failed_killable() assembly entry similar to call_rwsem_down_read_failed(): push dx register to stack in additional to common registers, as it's not declarated as modifiable in ____down_read(). Signed-off-by: NKirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: arnd@arndb.de Cc: avagin@virtuozzo.com Cc: davem@davemloft.net Cc: fenghua.yu@intel.com Cc: gorcunov@virtuozzo.com Cc: heiko.carstens@de.ibm.com Cc: hpa@zytor.com Cc: ink@jurassic.park.msu.ru Cc: mattst88@gmail.com Cc: rientjes@google.com Cc: rth@twiddle.net Cc: schwidefsky@de.ibm.com Cc: tony.luck@intel.com Cc: viro@zeniv.linux.org.uk Link: http://lkml.kernel.org/r/150670118802.23930.1316107715255410256.stgit@localhost.localdomainSigned-off-by: NIngo Molnar <mingo@kernel.org>
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