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Date: Mon, 16 Apr 2018 11:40:07 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Laura Abbott <labbott@...hat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Juergen Gross <jgross@...e.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
x86@...nel.org, xen-devel@...ts.xenproject.org,
linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] x86/xen: Remove use of VLAs
* Laura Abbott <labbott@...hat.com> wrote:
> There's an ongoing effort to remove VLAs[1] from the kernel to eventually
> turn on -Wvla. The few VLAs in use have an upper bound based on a size
> of 64K. This doesn't produce an excessively large stack so just switch
> the upper bound.
>
> [1] https://lkml.org/lkml/2018/3/7/621
>
> Signed-off-by: Laura Abbott <labbott@...hat.com>
> ---
> arch/x86/xen/enlighten_pv.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
> index c36d23aa6c35..d96a5a535cbb 100644
> --- a/arch/x86/xen/enlighten_pv.c
> +++ b/arch/x86/xen/enlighten_pv.c
> @@ -421,8 +421,7 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
> {
> unsigned long va = dtr->address;
> unsigned int size = dtr->size + 1;
> - unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
> - unsigned long frames[pages];
> + unsigned long frames[DIV_ROUND_UP(SZ_64K, PAGE_SIZE)];
> int f;
>
> /*
> @@ -470,8 +469,7 @@ static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
> {
> unsigned long va = dtr->address;
> unsigned int size = dtr->size + 1;
> - unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
> - unsigned long frames[pages];
> + unsigned long frames[DIV_ROUND_UP(SZ_64K, PAGE_SIZE)];
> int f;
Reviewed-by: Ingo Molnar <mingo@...nel.org>
Thanks,
Ingo
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