linux-kernel - Re: [PATCH v2 00/36] x86: Rewrite all syscall entries except native 64-bit

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Message-ID: <CALCETrU9Lb5z1Ytx-=LsUOm5eJJ4rUxVMKwkv+Kd9nSNn7SgAQ@mail.gmail.com>
Date:	Mon, 12 Oct 2015 11:41:46 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Richard Weinberger <richard.weinberger@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Andy Lutomirski <luto@...nel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Brian Gerst <brgerst@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH v2 00/36] x86: Rewrite all syscall entries except native 64-bit

On Mon, Oct 12, 2015 at 11:30 AM, Richard Weinberger
<richard.weinberger@...il.com> wrote:
> On Fri, Oct 9, 2015 at 3:06 PM, Ingo Molnar <mingo@...nel.org> wrote:
>> Ok, so I applied all of them to tip:x86/asm, in two phases, with small (stylistic)
>> edits - it all seems to work fine for me so far, so I pushed it all out to -tip
>> and linux-next.
>>
>
> FYI, this breaks the UML build:
>
>   CC      arch/x86/um/sys_call_table_64.o
> arch/x86/um/sys_call_table_64.c:49:1: error: unknown type name ‘sys_call_ptr_t’
>  const sys_call_ptr_t sys_call_table[] ____cacheline_aligned = {
>  ^
> arch/x86/um/sys_call_table_64.c:54:2: warning: initialization makes
> integer from pointer without a cast [enabled by default]
>   [0 ... __NR_syscall_max] = &sys_ni_syscall,
>   ^
> arch/x86/um/sys_call_table_64.c:54:2: warning: (near initialization
> for ‘sys_call_table[0]’) [enabled by default]
> arch/x86/um/sys_call_table_64.c:54:2: error: initializer element is
> not computable at load time
> arch/x86/um/sys_call_table_64.c:54:2: error: (near initialization for
> ‘sys_call_table[0]’)
>
> Andy, I suspect UML's syscall.h needs the sys_call_ptr_t type too?
>

Whoops, yes.  UML has some weird casts in the syscall code that might
be removable with that change, too.  Want to fix it or should I?

--Andy
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