On Thu, 20 May 2021 at 00:20, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > 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? I have reported this, https://lore.kernel.org/linux-mm/CA+G9fYt+6OeibZMD0fP=O3nqFbcN3O4xcLkjq0mpQbZJ2uxB9w@xxxxxxxxxxxxxx/ > > > 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. The below patch did not solve the reported problem. after applying this patch CONFIG_HAVE_MOVE_PUD disappeared from the config. but still i see WARNING: and BUG: when running LTP mm tests. Test log link, FYI, i386 kernel Image running on x86_64 machine. https://lkft.validation.linaro.org/scheduler/job/2749690#L10139 > Thanks, > > tglx > --- > Subject: x86: Don't enable CONFIG_MOVE_PUD for 32bit and !PAE > From: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > 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@xxxxxxxxxxxxx> > Cc: Kalesh Singh <kaleshsingh@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > 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 - Naresh
