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Message-ID: <CA+G9fYvHsa0TAqPBvHwPhhe_0qt8syEWkGV_GPjOyEOAO9q5Sw@mail.gmail.com>
Date: Mon, 29 Mar 2021 15:05:25 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: open list <linux-kernel@...r.kernel.org>,
linux-stable <stable@...r.kernel.org>,
Anshuman Khandual <anshuman.khandual@....com>,
David Hildenbrand <david@...hat.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Ard Biesheuvel <ardb@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Heiko Carstens <hca@...ux.ibm.com>,
Jason Wang <jasowang@...hat.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Michal Hocko <mhocko@...nel.org>,
Oscar Salvador <osalvador@...e.de>,
Pankaj Gupta <pankaj.gupta@...ud.ionos.com>,
Pankaj Gupta <pankaj.gupta.linux@...il.com>,
teawater <teawaterz@...ux.alibaba.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Wei Yang <richard.weiyang@...ux.alibaba.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.11 225/254] arm64/mm: define arch_get_mappable_range()
On Mon, 29 Mar 2021 at 14:10, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> From: Anshuman Khandual <anshuman.khandual@....com>
>
> [ Upstream commit 03aaf83fba6e5af08b5dd174c72edee9b7d9ed9b ]
>
> This overrides arch_get_mappable_range() on arm64 platform which will be
> used with recently added generic framework. It drops
> inside_linear_region() and subsequent check in arch_add_memory() which are
> no longer required. It also adds a VM_BUG_ON() check that would ensure
> that mhp_range_allowed() has already been called.
>
> Link: https://lkml.kernel.org/r/1612149902-7867-3-git-send-email-anshuman.khandual@arm.com
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> Reviewed-by: David Hildenbrand <david@...hat.com>
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Ard Biesheuvel <ardb@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Heiko Carstens <hca@...ux.ibm.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Pankaj Gupta <pankaj.gupta@...ud.ionos.com>
> Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
> Cc: teawater <teawaterz@...ux.alibaba.com>
> Cc: Vasily Gorbik <gor@...ux.ibm.com>
> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
> arch/arm64/mm/mmu.c | 15 +++++++--------
> 1 file changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index 6f0648777d34..92b3be127796 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -1443,16 +1443,19 @@ static void __remove_pgd_mapping(pgd_t *pgdir, unsigned long start, u64 size)
> free_empty_tables(start, end, PAGE_OFFSET, PAGE_END);
> }
>
> -static bool inside_linear_region(u64 start, u64 size)
> +struct range arch_get_mappable_range(void)
> {
> + struct range mhp_range;
> +
> /*
> * Linear mapping region is the range [PAGE_OFFSET..(PAGE_END - 1)]
> * accommodating both its ends but excluding PAGE_END. Max physical
> * range which can be mapped inside this linear mapping range, must
> * also be derived from its end points.
> */
> - return start >= __pa(_PAGE_OFFSET(vabits_actual)) &&
> - (start + size - 1) <= __pa(PAGE_END - 1);
> + mhp_range.start = __pa(_PAGE_OFFSET(vabits_actual));
> + mhp_range.end = __pa(PAGE_END - 1);
> + return mhp_range;
> }
>
> int arch_add_memory(int nid, u64 start, u64 size,
> @@ -1460,11 +1463,7 @@ int arch_add_memory(int nid, u64 start, u64 size,
> {
> int ret, flags = 0;
>
> - if (!inside_linear_region(start, size)) {
> - pr_err("[%llx %llx] is outside linear mapping region\n", start, start + size);
> - return -EINVAL;
> - }
> -
> + VM_BUG_ON(!mhp_range_allowed(start, size, true));
> if (rodata_full || debug_pagealloc_enabled())
> flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
The stable rc 5.10 and 5.11 builds failed for arm64 architecture
due to below warnings / errors,
> Anshuman Khandual <anshuman.khandual@....com>
> arm64/mm: define arch_get_mappable_range()
arch/arm64/mm/mmu.c: In function 'arch_add_memory':
arch/arm64/mm/mmu.c:1483:13: error: implicit declaration of function
'mhp_range_allowed'; did you mean 'cpu_map_prog_allowed'?
[-Werror=implicit-function-declaration]
VM_BUG_ON(!mhp_range_allowed(start, size, true));
^
include/linux/build_bug.h:30:63: note: in definition of macro
'BUILD_BUG_ON_INVALID'
#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
^
arch/arm64/mm/mmu.c:1483:2: note: in expansion of macro 'VM_BUG_ON'
VM_BUG_ON(!mhp_range_allowed(start, size, true));
^~~~~~~~~
Build link,
https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-stable-rc-5.11/DISTRO=lkft,MACHINE=juno,label=docker-buster-lkft/41/consoleText
https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-stable-rc-5.10/DISTRO=lkft,MACHINE=dragonboard-410c,label=docker-buster-lkft/120/consoleFull
--
Linaro LKFT
https://lkft.linaro.org
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