[PATCH 1/4] hugetlbfs: add arch_hugetlb_valid_size

[Mike Kravetz]

On 3/18/20 3:09 PM, Will Deacon wrote:
> On Wed, Mar 18, 2020 at 03:06:31PM -0700, Mike Kravetz wrote:
>> The architecture independent routine hugetlb_default_setup sets up
>> the default huge pages size.  It has no way to verify if the passed
>> value is valid, so it accepts it and attempts to validate at a later
>> time.  This requires undocumented cooperation between the arch specific
>> and arch independent code.
>>
>> For architectures that support more than one huge page size, provide
>> a routine arch_hugetlb_valid_size to validate a huge page size.
>> hugetlb_default_setup can use this to validate passed values.
>>
>> arch_hugetlb_valid_size will also be used in a subsequent patch to
>> move processing of the "hugepagesz=" in arch specific code to a common
>> routine in arch independent code.
>>
>> Signed-off-by: Mike Kravetz <mike.kravetz at oracle.com>
>> ---
>>  arch/arm64/include/asm/hugetlb.h   |  2 ++
>>  arch/arm64/mm/hugetlbpage.c        | 19 ++++++++++++++-----
>>  arch/powerpc/include/asm/hugetlb.h |  3 +++
>>  arch/powerpc/mm/hugetlbpage.c      | 20 +++++++++++++-------
>>  arch/riscv/include/asm/hugetlb.h   |  3 +++
>>  arch/riscv/mm/hugetlbpage.c        | 28 ++++++++++++++++++----------
>>  arch/s390/include/asm/hugetlb.h    |  3 +++
>>  arch/s390/mm/hugetlbpage.c         | 18 +++++++++++++-----
>>  arch/sparc/include/asm/hugetlb.h   |  3 +++
>>  arch/sparc/mm/init_64.c            | 23 ++++++++++++++++-------
>>  arch/x86/include/asm/hugetlb.h     |  3 +++
>>  arch/x86/mm/hugetlbpage.c          | 21 +++++++++++++++------
>>  include/linux/hugetlb.h            |  7 +++++++
>>  mm/hugetlb.c                       | 16 +++++++++++++---
>>  14 files changed, 126 insertions(+), 43 deletions(-)
>>
>> diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
>> index 2eb6c234d594..3248f35213ee 100644
>> --- a/arch/arm64/include/asm/hugetlb.h
>> +++ b/arch/arm64/include/asm/hugetlb.h
<snip>
>> +
>> +static __init int setup_hugepagesz(char *opt)
>> +{
>> +	unsigned long long ps = memparse(opt, &opt);
>> +
>> +	if arch_hugetlb_valid_size(ps)) {
> 
> Please compile your changes if you're touching multiple architectures. You
> can get cross-compiler binaries from:
> 

My apologies.  I only cross compiled the result of the series on each
architecture.  The above code is obviously bad.

-- 
Mike Kravetz