linux-kernel - Re: [PATCH 10/11] x86, rwsem: provide __down_write

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Date:	Wed, 13 Apr 2016 11:19:43 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"David S. Miller" <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Zankel <chris@...kel.net>,
	Max Filippov <jcmvbkbc@...il.com>, x86@...nel.org,
	linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	linux-arch@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 10/11] x86, rwsem: provide __down_write_killable


* Michal Hocko <mhocko@...nel.org> wrote:

> On Wed 13-04-16 11:08:30, Ingo Molnar wrote:
> > 
> > * Michal Hocko <mhocko@...nel.org> wrote:
> [...]
> > > +ENTRY(call_rwsem_down_write_failed_killable)
> > > +	save_common_regs
> > > +	movq %rax,%rdi
> > > +	call rwsem_down_write_failed_killable
> > > +	restore_common_regs
> > > +	ret
> > > +ENDPROC(call_rwsem_down_write_failed_killable)
> > 
> > Got this objtool warning on x86-64 allyesconfig:
> > 
> >   arch/x86/lib/rwsem.o: warning: objtool: call_rwsem_down_write_failed_killable()+0xe: call without frame pointer save/setup
> 
> Peter has already pointed that out. This is because the 4.5 which I was
> basing my work on doesn't have 3387a535ce62 ("x86/asm: Create stack
> frames in rwsem functions") which shown up in 4.6-rc1. He mentioned to
> add the missing FRAME_{BEGIN,END} during the merge AFAIR.
> 
> Does that sound reasonable to you or should I rebase?

I'm testing your patches today, if they are otherwise OK then please send a delta 
patch against the tip:locking/rwsem tree I'll push out.

Thanks,

	Ingo