From: Greg KH <gregkh@linuxfoundation.org>
To: Feng Tang <feng.tang@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
stable@vger.kernel.org, Juergen Gross <jgross@suse.com>,
H Peter Anvin <hpa@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Michal Hocko <mhocko@kernel.org>, Yinghai Lu <yinghai@kernel.org>,
Dave Hansen <dave.hansen@intel.com>,
Andi Kleen <ak@linux.intel.com>,
Andy Lutomirsky <luto@kernel.org>
Subject: Re: [PATCH backport for 4.9] x86/mm: Expand static page table for fixmap space
Date: Thu, 11 Oct 2018 11:45:19 +0200 [thread overview]
Message-ID: <20181011094519.GC29184@kroah.com> (raw)
In-Reply-To: <1539140654-84529-1-git-send-email-feng.tang@intel.com>
On Wed, Oct 10, 2018 at 11:04:14AM +0800, Feng Tang wrote:
> commit 05ab1d8a4b36ee912b7087c6da127439ed0a903e upstream
>
> We met a kernel panic when enabling earlycon, which is due to the fixmap
> address of earlycon is not statically setup.
>
> Currently the static fixmap setup in head_64.S only covers 2M virtual
> address space, while it actually could be in 4M space with different
> kernel configurations, e.g. when VSYSCALL emulation is disabled.
>
> So increase the static space to 4M for now by defining FIXMAP_PMD_NUM to 2,
> and add a build time check to ensure that the fixmap is covered by the
> initial static page tables.
>
> Fixes: 1ad83c858c7d ("x86_64,vsyscall: Make vsyscall emulation configurable")
> Suggested-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Feng Tang <feng.tang@intel.com>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: <stable@vger.kernel.org> # v4.9
> Cc: Juergen Gross <jgross@suse.com>
> Cc: H Peter Anvin <hpa@linux.intel.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Michal Hocko <mhocko@kernel.org>
> Cc: Yinghai Lu <yinghai@kernel.org>
> Cc: Dave Hansen <dave.hansen@intel.com>
> Cc: Andi Kleen <ak@linux.intel.com>
> Cc: Andy Lutomirsky <luto@kernel.org>
> ---
> arch/x86/include/asm/fixmap.h | 10 ++++++++++
> arch/x86/include/asm/pgtable_64.h | 3 ++-
> arch/x86/kernel/head_64.S | 16 ++++++++++++----
> arch/x86/mm/pgtable.c | 9 +++++++++
> arch/x86/xen/mmu.c | 8 ++++++--
> 5 files changed, 39 insertions(+), 7 deletions(-)
>
Now applied, thanks.
greg k-h
prev parent reply other threads:[~2018-10-11 17:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-10 3:04 [PATCH backport for 4.9] x86/mm: Expand static page table for fixmap space Feng Tang
2018-10-11 9:45 ` Greg KH [this message]
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