linux-kernel - Re: [PATCH 01/11] x86: entry_64.S: always allocate complete "struct pt

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Message-ID: <CAK1hOcMZKpcLVWffv_L9DoaK5-V2qSHkm3N2=mo8wKZfEMLyWA@mail.gmail.com>
Date:	Wed, 14 Jan 2015 23:17:07 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	X86 ML <x86@...nel.org>, Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/11] x86: entry_64.S: always allocate complete "struct pt_regs"

On Wed, Jan 14, 2015 at 10:48 PM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
> Macros which manipulate "struct pt_regs" on stack are reworked:
> ALLOC_PT_GPREGS_ON_STACK allocates the structure.
> SAVE_C_REGS saves to it those registers which are clobbered by C code.
> SAVE_EXTRA_REGS saves to it all other registers.
> Corresponding RESTORE_* and REMOVE_PT_GPREGS_FROM_STACK macros reverse it.

Andy,

Please note that this patch set also needs the previously posted patch:

[PATCH 3/4] x86: open-code register save/restore in trace_hardirqs thunks

which is not present in your tree - otherwise arch/x86/lib/thunk_64.S
will not compile (no SAVE_ARGS anymore).

-- 
vda
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