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Date: Wed, 6 Sep 2017 00:26:10 -0500 From: Miguel Bernal Marin <miguel.bernal.marin@...ux.intel.com> To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, "H . Peter Anvin" <hpa@...or.com> Cc: linux-kernel@...r.kernel.org, x86@...nel.org Subject: [PATCH 0/3] locking/rwsem/x86: Add stack frame dependency for some inline asm 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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