linux-kernel - Re: [PATCH] fix compilation of 64-bit kernel with 32-bit compiler

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Message-ID: <20180308073940.GT25181@hirez.programming.kicks-ass.net>
Date:   Thu, 8 Mar 2018 08:39:40 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix compilation of 64-bit kernel with 32-bit compiler

On Thu, Mar 08, 2018 at 01:11:26AM -0500, Mikulas Patocka wrote:
> The patch b5bc2231b8ad4387c9641f235ca0ad8cd300b6df ("objtool: Add 
> retpoline validation") broke compiling 64-bit kernel with 32-bit compiler.
> 
> This patch fixes the following error and a large number of "can't find
> rela for retpoline_safe" errors that occur when using x32 or i386 gcc.
> 
> You shouldn't use the type 'unsigned long' in objtool at all - because its
> size depends on the compiler and not on the kernel you are compiling.

Your patch is wrong because the data field is actually a long. A correct
patch is already in merged in tip.