Messages in this thread | | | From | Miguel Bernal Marin <> | Subject | [PATCH 0/3] locking/rwsem/x86: Add stack frame dependency for some inline asm | Date | Wed, 6 Sep 2017 00:26:10 -0500 |
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Some warning were showed by objtool using gcc 7.2.0
kernel/locking/rwsem.o: warning: objtool: up_read()+0x11: call without frame pointer save/setup kernel/locking/rwsem.o: warning: objtool: up_write()+0x17: call without frame pointer save/setup kernel/locking/rwsem.o: warning: objtool: downgrade_write()+0x22: call without frame pointer save/setup
which means gcc placed an inline asm function and its call instruction before the frame pointer setup.
This series forces a stack frame to be created before the call instruction by listing the stack pointer as an output operand in the inline asm statement.
Miguel Bernal Marin (3): locking/rwsem/x86: Add stack frame dependency for __up_read() locking/rwsem/x86: Add stack frame dependency for __up_write() locking/rwsem/x86: Add stack frame dependency for __downgrade_write()
arch/x86/include/asm/rwsem.h | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-)
-- 2.14.1
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