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Date: Tue, 28 Apr 2020 09:47:13 +0530
From: Sandipan Das <sandipan@...ux.ibm.com>
To: Mike Kravetz <mike.kravetz@...cle.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
linux-doc@...r.kernel.org,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
"David S.Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Jonathan Corbet <corbet@....net>,
Longpeng <longpeng2@...wei.com>,
Christophe Leroy <christophe.leroy@....fr>,
Randy Dunlap <rdunlap@...radead.org>,
Mina Almasry <almasrymina@...gle.com>,
Peter Xu <peterx@...hat.com>,
Nitesh Narayan Lal <nitesh@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 2/4] hugetlbfs: move hugepagesz= parsing to arch
independent code
Hi Mike,
On 28/04/20 12:39 am, Mike Kravetz wrote:
> On 4/27/20 10:25 AM, Mike Kravetz wrote:
>> On 4/26/20 10:04 PM, Sandipan Das wrote:
>>> On 18/04/20 12:20 am, Mike Kravetz wrote:
>>>> Now that architectures provide arch_hugetlb_valid_size(), parsing
>>>> of "hugepagesz=" can be done in architecture independent code.
>>>
>>> This isn't working as expected on powerpc64.
>>>
>>> [ 0.000000] Kernel command line: root=UUID=dc7b49cf-95a2-4996-8e7d-7c64ddc7a6ff hugepagesz=16G hugepages=2
>>> [ 0.000000] HugeTLB: huge pages not supported, ignoring hugepagesz = 16G
>>> [ 0.000000] HugeTLB: huge pages not supported, ignoring hugepages = 2
>>> [ 0.284177] HugeTLB registered 16.0 MiB page size, pre-allocated 0 pages
>>> [ 0.284182] HugeTLB registered 16.0 GiB page size, pre-allocated 0 pages
>>> [ 2.585062] hugepagesz=16G
>>> [ 2.585063] hugepages=2
>>>
>>
>> In the new arch independent version of hugepages_setup, I added the following
>> code in patch 4 off this series:
>>
>>> + if (!hugepages_supported()) {
>>> + pr_warn("HugeTLB: huge pages not supported, ignoring hugepages = %s\n", s);
>>> + return 0;
>>> + }
>>> +
>>
>> The easy solution is to remove all the hugepages_supported() checks from
>> command line parsing routines and rely on the later check in hugetlb_init().
>
> Here is a patch to address the issue. Sorry, as my series breaks all hugetlb
> command line processing on powerpc.
>
> Sandipan, can you test the following patch?
>
The following patch does fix the issue. Thanks.
Tested-by: Sandipan Das <sandipan@...ux.ibm.com>
> From 480fe2847361e2a85aeec1fb39fe643bb7100a07 Mon Sep 17 00:00:00 2001
> From: Mike Kravetz <mike.kravetz@...cle.com>
> Date: Mon, 27 Apr 2020 11:37:30 -0700
> Subject: [PATCH] hugetlbfs: fix changes to command line processing
>
> Previously, a check for hugepages_supported was added before processing
> hugetlb command line parameters. On some architectures such as powerpc,
> hugepages_supported() is not set to true until after command line
> processing. Therefore, no hugetlb command line parameters would be
> accepted.
>
> Remove the additional checks for hugepages_supported. In hugetlb_init,
> print a warning if !hugepages_supported and command line parameters were
> specified.
>
> Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
> ---
> mm/hugetlb.c | 20 ++++----------------
> 1 file changed, 4 insertions(+), 16 deletions(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 1075abdb5717..5548e8851b93 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3212,8 +3212,11 @@ static int __init hugetlb_init(void)
> {
> int i;
>
> - if (!hugepages_supported())
> + if (!hugepages_supported()) {
> + if (hugetlb_max_hstate || default_hstate_max_huge_pages)
> + pr_warn("HugeTLB: huge pages not supported, ignoring associated command-line parameters\n");
> return 0;
> + }
>
> /*
> * Make sure HPAGE_SIZE (HUGETLB_PAGE_ORDER) hstate exists. Some
> @@ -3315,11 +3318,6 @@ static int __init hugepages_setup(char *s)
> unsigned long *mhp;
> static unsigned long *last_mhp;
>
> - if (!hugepages_supported()) {
> - pr_warn("HugeTLB: huge pages not supported, ignoring hugepages = %s\n", s);
> - return 0;
> - }
> -
> if (!parsed_valid_hugepagesz) {
> pr_warn("HugeTLB: hugepages=%s does not follow a valid hugepagesz, ignoring\n", s);
> parsed_valid_hugepagesz = true;
> @@ -3372,11 +3370,6 @@ static int __init hugepagesz_setup(char *s)
> struct hstate *h;
>
> parsed_valid_hugepagesz = false;
> - if (!hugepages_supported()) {
> - pr_warn("HugeTLB: huge pages not supported, ignoring hugepagesz = %s\n", s);
> - return 0;
> - }
> -
> size = (unsigned long)memparse(s, NULL);
>
> if (!arch_hugetlb_valid_size(size)) {
> @@ -3424,11 +3417,6 @@ static int __init default_hugepagesz_setup(char *s)
> unsigned long size;
>
> parsed_valid_hugepagesz = false;
> - if (!hugepages_supported()) {
> - pr_warn("HugeTLB: huge pages not supported, ignoring default_hugepagesz = %s\n", s);
> - return 0;
> - }
> -
> if (parsed_default_hugepagesz) {
> pr_err("HugeTLB: default_hugepagesz previously specified, ignoring %s\n", s);
> return 0;
>
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