On 10/13/19 11:12 PM, kbuild test robot wrote:
> Hi John,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [cannot apply to v5.4-rc3 next-20191011]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify
the
> base tree in git format-patch, please see
https://stackoverflow.com/a/37406982]
>
> url:
https://github.com/0day-ci/linux/commits/John-Hubbard/gup-c-gup_benchmark...
> config: powerpc-defconfig (attached as .config)
> compiler: powerpc64-linux-gcc (GCC) 7.4.0
> reproduce:
> wget
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
> chmod +x ~/bin/make.cross
> # save the attached .config to linux build tree
> GCC_VERSION=7.4.0 make.cross ARCH=powerpc
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp(a)intel.com>
>
> All errors (new ones prefixed by >>):
>
> mm/gup.c: In function 'gup_hugepte':
> > > mm/gup.c:1990:33: error: 'write' undeclared (first use in this
function); did you mean 'writeq'?
> if (!pte_access_permitted(pte, write))
> ^~~~~
> writeq
> mm/gup.c:1990:33: note: each undeclared identifier is reported only once for
each function it appears in
>
OK, so this shows that my cross-compiler test scripts are faulty lately,
sorry I missed this.
But more importantly, the above missed case is an example of when "write"
really
means "write", as opposed to meaning flags.
Please put this patch on hold or drop it, until we hear from the authors as to how
they would like to resolve this. I suspect it will end up as something like:
bool write = (flags & FOLL_WRITE);
...perhaps?
Just use
if (!pte_access_permitted(pte, flags & FOLL_WRITE))
as we have in gup_pte_range().
And add:
Fixes: cbd34da7dc9a ("mm: move the powerpc hugepd code to mm/gup.c")
--
Kirill A. Shutemov