From: Thomas Gleixner <tglx@linutronix.de>
To: Naresh Kamboju <naresh.kamboju@linaro.org>,
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
lkft-triage@lists.linaro.org,
Andrew Morton <akpm@linux-foundation.org>,
Ira Weiny <ira.weiny@intel.com>,
Oliver Sang <oliver.sang@intel.com>,
Chaitanya Kulkarni
<Chaitanya.Kulkarni@wdc.com>,x86@kernel.org,Kalesh Singh
<kaleshsingh@google.com>
Subject: Re: BUG: unable to handle page fault for address - EIP: __kmap_local_page_prot
Date: Wed, 19 May 2021 20:50:54 +0200 [thread overview]
Message-ID: <87mtsqd0c1.ffs@nanos.tec.linutronix.de> (raw)
In-Reply-To: <CA+G9fYtAbUGO9oAtL8eZ9Pu-_a1wx3y8Tk=pDO3Fh3dEwoRGWg@mail.gmail.com>
On Wed, May 19 2021 at 20:38, Naresh Kamboju wrote:
> While running LTP mm test suite on i386 kernel the following warning and BUG
> reported on linux next 5.13.0-rc2-next-20210519.
>
> The warning is not regression, We have been noticing these warnings often on
> i386
Noticing? Did you report them?
> but kernel BUG: looks to be a new crash.
It's just the consequence of the problem which is pointed out by the
warning. Fix below.
Thanks,
tglx
---
Subject: x86: Don't enable CONFIG_MOVE_PUD for 32bit and !PAE
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 19 May 2021 20:37:34 +0200
MOVE_PUD cannot work for 2-level paging obviously.
Fixes: be37c98d1134 ("x86: mremap speedup - Enable HAVE_MOVE_PUD")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: stable@vger.kernel.org
---
arch/x86/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -219,7 +219,7 @@ config X86
select HAVE_MIXED_BREAKPOINTS_REGS
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_MOVE_PMD
- select HAVE_MOVE_PUD
+ select HAVE_MOVE_PUD if PGTABLE_LEVELS > 2
select HAVE_NMI
select HAVE_OPTPROBES
select HAVE_PCSPKR_PLATFORM
next prev parent reply other threads:[~2021-05-19 18:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 15:08 BUG: unable to handle page fault for address - EIP: __kmap_local_page_prot Naresh Kamboju
2021-05-19 15:31 ` Matthew Wilcox
2021-05-19 18:50 ` Thomas Gleixner [this message]
2021-05-19 19:22 ` Peter Zijlstra
2021-05-20 7:10 ` Naresh Kamboju
2021-05-20 12:51 ` Thomas Gleixner
2021-05-20 13:04 ` Naresh Kamboju
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