linux-kernel - Re: [PATCH v6 47/76] x86/dumpstack/64: Add noinstr version of get_stack

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Message-ID: <20200831111123.GG27517@zn.tnic>
Date:   Mon, 31 Aug 2020 13:11:23 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Joerg Roedel <joro@...tes.org>
Cc:     x86@...nel.org, Joerg Roedel <jroedel@...e.de>, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Martin Radev <martin.b.radev@...il.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v6 47/76] x86/dumpstack/64: Add noinstr version of
 get_stack_info()

On Mon, Aug 24, 2020 at 10:54:42AM +0200, Joerg Roedel wrote:
> diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
> index c49cf594714b..5a85730eb0ca 100644
> --- a/arch/x86/kernel/dumpstack_64.c
> +++ b/arch/x86/kernel/dumpstack_64.c
> @@ -85,7 +85,7 @@ struct estack_pages estack_pages[CEA_ESTACK_PAGES] ____cacheline_aligned = {
>  	EPAGERANGE(VC2),
>  };
>  
> -static bool in_exception_stack(unsigned long *stack, struct stack_info *info)
> +static bool __always_inline in_exception_stack(unsigned long *stack, struct stack_info *info)

Yeah, checkpatch seems to complain correctly here:

ERROR: inline keyword should sit between storage class and type
#88: FILE: arch/x86/kernel/dumpstack_64.c:88:
+static bool __always_inline in_exception_stack(unsigned long *stack, struct stack_info *info)

ERROR: inline keyword should sit between storage class and type
#97: FILE: arch/x86/kernel/dumpstack_64.c:129:
+static bool __always_inline in_irq_stack(unsigned long *stack, struct stack_info *info)

> +int get_stack_info(unsigned long *stack, struct task_struct *task,
> +		   struct stack_info *info, unsigned long *visit_mask)
> +{
> +	task = task ? : current;
> +
> +	if (!stack)
> +		goto unknown;
> +
> +	if (!get_stack_info_noinstr(stack, task, info))
> +		goto unknown;
>  
> -recursion_check:
>  	/*
>  	 * Make sure we don't iterate through any given stack more than once.
>  	 * If it comes up a second time then there's something wrong going on:
> @@ -196,4 +202,5 @@ int get_stack_info(unsigned long *stack, struct task_struct *task,
>  unknown:
>  	info->type = STACK_TYPE_UNKNOWN;
>  	return -EINVAL;
> +
^ Superfluous newline.

-- 
Regards/Gruss,
    Boris.

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