linux-kernel - Re: [PATCH 1/4] x86: entry

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Message-ID: <CALCETrXNYe5+NGm0qPrGw+9A3DGZ0D08mbtbt5ObKCdpu7_Dcw@mail.gmail.com>
Date:	Sat, 10 Jan 2015 14:12:51 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 1/4] x86: entry_64.S: delete unused code

On Sat, Jan 10, 2015 at 2:00 PM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
> A define, two macros and an unreferenced bit of assembly are gone.


Acked-by: Andy Lutomirski <luto@...capital.net>

>
> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> Acked-by: Borislav Petkov <bp@...e.de>
> CC: Linus Torvalds <torvalds@...ux-foundation.org>
> CC: Oleg Nesterov <oleg@...hat.com>
> CC: "H. Peter Anvin" <hpa@...or.com>
> CC: Borislav Petkov <bp@...en8.de>
> CC: Andy Lutomirski <luto@...capital.net>
> CC: Frederic Weisbecker <fweisbec@...il.com>
> CC: X86 ML <x86@...nel.org>
> CC: Alexei Starovoitov <ast@...mgrid.com>
> CC: Will Drewry <wad@...omium.org>
> CC: Kees Cook <keescook@...omium.org>
> CC: linux-kernel@...r.kernel.org
> ---
>  arch/x86/include/asm/calling.h |  1 -
>  arch/x86/kernel/entry_64.S     | 34 ----------------------------------
>  2 files changed, 35 deletions(-)
>
> diff --git a/arch/x86/include/asm/calling.h b/arch/x86/include/asm/calling.h
> index 76659b6..1f1297b 100644
> --- a/arch/x86/include/asm/calling.h
> +++ b/arch/x86/include/asm/calling.h
> @@ -83,7 +83,6 @@ For 32-bit we have the following conventions - kernel is built with
>  #define SS             160
>
>  #define ARGOFFSET      R11
> -#define SWFRAME                ORIG_RAX
>
>         .macro SAVE_ARGS addskip=0, save_rcx=1, save_r891011=1, rax_enosys=0
>         subq  $9*8+\addskip, %rsp
> diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
> index 931f32f..5ed4773 100644
> --- a/arch/x86/kernel/entry_64.S
> +++ b/arch/x86/kernel/entry_64.S
> @@ -155,27 +155,6 @@ ENDPROC(native_usergs_sysret64)
>         movq \tmp,R11+\offset(%rsp)
>         .endm
>
> -       .macro FAKE_STACK_FRAME child_rip
> -       /* push in order ss, rsp, eflags, cs, rip */
> -       xorl %eax, %eax
> -       pushq_cfi $__KERNEL_DS /* ss */
> -       /*CFI_REL_OFFSET        ss,0*/
> -       pushq_cfi %rax /* rsp */
> -       CFI_REL_OFFSET  rsp,0
> -       pushq_cfi $(X86_EFLAGS_IF|X86_EFLAGS_FIXED) /* eflags - interrupts on */
> -       /*CFI_REL_OFFSET        rflags,0*/
> -       pushq_cfi $__KERNEL_CS /* cs */
> -       /*CFI_REL_OFFSET        cs,0*/
> -       pushq_cfi \child_rip /* rip */
> -       CFI_REL_OFFSET  rip,0
> -       pushq_cfi %rax /* orig rax */
> -       .endm
> -
> -       .macro UNFAKE_STACK_FRAME
> -       addq $8*6, %rsp
> -       CFI_ADJUST_CFA_OFFSET   -(6*8)
> -       .endm
> -
>  /*
>   * initial frame state for interrupts (and exceptions without error code)
>   */
> @@ -626,19 +605,6 @@ END(\label)
>         FORK_LIKE  vfork
>         FIXED_FRAME stub_iopl, sys_iopl
>
> -ENTRY(ptregscall_common)
> -       DEFAULT_FRAME 1 8       /* offset 8: return address */
> -       RESTORE_TOP_OF_STACK %r11, 8
> -       movq_cfi_restore R15+8, r15
> -       movq_cfi_restore R14+8, r14
> -       movq_cfi_restore R13+8, r13
> -       movq_cfi_restore R12+8, r12
> -       movq_cfi_restore RBP+8, rbp
> -       movq_cfi_restore RBX+8, rbx
> -       ret $REST_SKIP          /* pop extended registers */
> -       CFI_ENDPROC
> -END(ptregscall_common)
> -
>  ENTRY(stub_execve)
>         CFI_STARTPROC
>         addq $8, %rsp
> --
> 1.8.1.4
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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