On Mon, 20 Apr 2020 at 23:43, Mike Kravetz <mike.kravetz@xxxxxxxxxx> wrote: > > On 4/20/20 1:29 PM, Anders Roxell wrote: > > On Mon, 20 Apr 2020 at 20:23, Mike Kravetz <mike.kravetz@xxxxxxxxxx> wrote: > >> On 4/20/20 8:34 AM, Qian Cai wrote: > >>> > >>> Reverted this series fixed many undefined behaviors on arm64 with the config, > >> While rearranging the code (patch 3 in series), I made the incorrect > >> assumption that CONT_XXX_SIZE == (1UL << CONT_XXX_SHIFT). However, > >> this is not the case. Does the following patch fix these issues? > >> > >> From b75cb4a0852e208bee8c4eb347dc076fcaa88859 Mon Sep 17 00:00:00 2001 > >> From: Mike Kravetz <mike.kravetz@xxxxxxxxxx> > >> Date: Mon, 20 Apr 2020 10:41:18 -0700 > >> Subject: [PATCH] arm64/hugetlb: fix hugetlb initialization > >> > >> When calling hugetlb_add_hstate() to initialize a new hugetlb size, > >> be sure to use correct huge pages size order. > >> > >> Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> > >> --- > >> arch/arm64/mm/hugetlbpage.c | 8 ++++---- > >> 1 file changed, 4 insertions(+), 4 deletions(-) > >> > >> diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c > >> index 9ca840527296..a02411a1f19a 100644 > >> --- a/arch/arm64/mm/hugetlbpage.c > >> +++ b/arch/arm64/mm/hugetlbpage.c > >> @@ -453,11 +453,11 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma, > >> static int __init hugetlbpage_init(void) > >> { > >> #ifdef CONFIG_ARM64_4K_PAGES > >> - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); > >> + hugetlb_add_hstate(ilog2(PUD_SIZE) - PAGE_SHIFT); > >> #endif > >> - hugetlb_add_hstate(CONT_PMD_SHIFT - PAGE_SHIFT); > >> - hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); > >> - hugetlb_add_hstate(CONT_PTE_SHIFT - PAGE_SHIFT); > >> + hugetlb_add_hstate(ilog2(CONT_PMD_SIZE) - PAGE_SHIFT); > >> + hugetlb_add_hstate(ilog2(PMD_SIZE) - PAGE_SHIFT); > >> + hugetlb_add_hstate(ilog2(CONT_PTE_SIZE) - PAGE_SHIFT); > >> > >> return 0; > >> } > > > > I build this for an arm64 kernel and ran it in qemu and it worked. > > Thanks for testing Anders! > > Will, here is an updated version of the patch based on your suggestion. > I added the () for emphasis but that may just be noise for some. Also, > the naming differences and values for CONT_PTE may make some people > look twice. Not sure if being consistent here helps? > > I have only built this. No testing. > > From daf833ab6b806ecc0816d84d45dcbacc052a7eec Mon Sep 17 00:00:00 2001 > From: Mike Kravetz <mike.kravetz@xxxxxxxxxx> > Date: Mon, 20 Apr 2020 13:56:15 -0700 > Subject: [PATCH] arm64/hugetlb: fix hugetlb initialization > > When calling hugetlb_add_hstate() to initialize a new hugetlb size, > be sure to use correct huge pages size order. > > Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Tested-by: Anders Roxell <anders.roxell@xxxxxxxxxx> I tested this patch on qemu-aarch64. Cheers, Anders > --- > arch/arm64/mm/hugetlbpage.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c > index 9ca840527296..bed6dc7c4276 100644 > --- a/arch/arm64/mm/hugetlbpage.c > +++ b/arch/arm64/mm/hugetlbpage.c > @@ -455,9 +455,9 @@ static int __init hugetlbpage_init(void) > #ifdef CONFIG_ARM64_4K_PAGES > hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); > #endif > - hugetlb_add_hstate(CONT_PMD_SHIFT - PAGE_SHIFT); > + hugetlb_add_hstate((CONT_PMD_SHIFT + PMD_SHIFT) - PAGE_SHIFT); > hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); > - hugetlb_add_hstate(CONT_PTE_SHIFT - PAGE_SHIFT); > + hugetlb_add_hstate((CONT_PTE_SHIFT + PAGE_SHIFT) - PAGE_SHIFT); > > return 0; > } > -- > 2.25.2 >