linux-kernel - Re: [PATCH v2 01/59] x86/paravirt: Ensure proper alignment

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Date:   Fri, 2 Sep 2022 18:05:05 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Joao Moreira <joao.moreira@...el.com>,
        Joseph Nuzman <joseph.nuzman@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v2 01/59] x86/paravirt: Ensure proper alignment

On 02.09.22 15:06, Peter Zijlstra wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> The entries in the .parainstr sections are 8 byte aligned and the
> corresponding C struct makes the array offset 16 bytes.
> 
> Though the pushed entries are only using 12 bytes. .parainstr_end is
> therefore 4 bytes short.
> 
> That works by chance because it's only used in a loop:
> 
>       for (p = start; p < end; p++)
> 
> But this falls flat when calculating the number of elements:
> 
>      n = end - start
> 
> That's obviously off by one.
> 
> Ensure that the gap is filled and the last entry is occupying 16 bytes.
> 
> Cc: Juergen Gross <jgross@...e.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen

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