Re: [PATCH v8 15/23] mm/hugetlb: Handle pte markers in page faults

[Peter Xu <peterx@redhat.com>]

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On Wed, Apr 06, 2022 at 09:37:00PM +0800, kernel test robot wrote:
> Hi Peter,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on hnaz-mm/master]
> [cannot apply to arnd-asm-generic/master linus/master linux/master v5.18-rc1 next-20220406]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Peter-Xu/userfaultfd-wp-Support-shmem-and-hugetlbfs/20220405-100136
> base:   https://github.com/hnaz/linux-mm master
> config: s390-randconfig-r044-20220406 (https://download.01.org/0day-ci/archive/20220406/202204062154.2txNJyaf-lkp(a)intel.com/config)
> compiler: s390-linux-gcc (GCC) 11.2.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/intel-lab-lkp/linux/commit/e7e7aaec811e2817cd169f0cc1d8f81bdf1f05c3
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Peter-Xu/userfaultfd-wp-Support-shmem-and-hugetlbfs/20220405-100136
>         git checkout e7e7aaec811e2817cd169f0cc1d8f81bdf1f05c3
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=s390 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>    mm/hugetlb.c: In function 'hugetlb_fault':
> >> mm/hugetlb.c:5678:13: error: implicit declaration of function 'huge_pte_none_mostly'; did you mean 'pte_none_mostly'? [-Werror=implicit-function-declaration]
>     5678 |         if (huge_pte_none_mostly(entry)) {
>          |             ^~~~~~~~~~~~~~~~~~~~
>          |             pte_none_mostly
>    cc1: some warnings being treated as errors

Ah, the s390 stub was forgotten again, sorry.  I hope someday s390 will
start to include asm-generic/hugetlb.h like all the rest archs, because
that's really from the gut feeling of how it should happen.. or the dir
should be renamed to asm-generic-without-s390/. :(

An expected fix patch attached (to be squashed into patch "mm: Introduce
PTE_MARKER swap entry").

Thanks,

-- 
Peter Xu

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From 8b84d7f6b86c30623208eff386b4f5169f1cb0db Mon Sep 17 00:00:00 2001
From: Peter Xu <peterx@redhat.com>
Date: Wed, 6 Apr 2022 10:55:55 -0400
Subject: [PATCH] fixup! mm: Introduce PTE_MARKER swap entry

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 arch/s390/include/asm/hugetlb.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
index be99eda87f4d..32c3fd6e878e 100644
--- a/arch/s390/include/asm/hugetlb.h
+++ b/arch/s390/include/asm/hugetlb.h
@@ -85,6 +85,11 @@ static inline int huge_pte_none(pte_t pte)
 	return pte_none(pte);
 }
 
+static inline int huge_pte_none_mostly(pte_t pte)
+{
+	return huge_pte_none(pte);
+}
+
 static inline int huge_pte_write(pte_t pte)
 {
 	return pte_write(pte);
-- 
2.32.0