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. Also to be easy to maintain and understand the operands from the extended assembler instructions were converted to named operands. Changes in v3: - Convert to named operands Changes in v2: - Update first parameter from _ASM_ADD to '%3' at __downgrade_write() Miguel Bernal Marin (6): 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() x86, asm/rwsem: Use named operands in __up_read() x86, asm/rwsem: Use named operands in __up_write() x86, asm/rwsem: Use named operands in __downgrade_write() arch/x86/include/asm/rwsem.h | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) -- 2.14.1
