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Miller" , Thomas Gleixner , Ingo Molnar , Dave Hansen , Jonathan Corbet , Longpeng , Andrew Morton Content-Type: text/plain; charset="UTF-8" Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Wed, Mar 18, 2020 at 3:07 PM Mike Kravetz wrote: > > The routine hugetlb_add_hstate prints a warning if the hstate already > exists. This was originally done as part of kernel command line > parsing. If 'hugepagesz=' was specified more than once, the warning > pr_warn("hugepagesz= specified twice, ignoring\n"); > would be printed. > > Some architectures want to enable all huge page sizes. They would > call hugetlb_add_hstate for all supported sizes. However, this was > done after command line processing and as a result hstates could have > already been created for some sizes. To make sure no warning were > printed, there would often be code like: > if (!size_to_hstate(size) > hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT) > > The only time we want to print the warning is as the result of command > line processing. So, remove the warning from hugetlb_add_hstate and > add it to the single arch independent routine processing "hugepagesz=". > After this, calls to size_to_hstate() in arch specific code can be > removed and hugetlb_add_hstate can be called without worrying about > warning messages. > > Signed-off-by: Mike Kravetz > --- > arch/arm64/mm/hugetlbpage.c | 16 ++++------------ > arch/powerpc/mm/hugetlbpage.c | 3 +-- > arch/riscv/mm/hugetlbpage.c | 2 +- > arch/sparc/mm/init_64.c | 19 ++++--------------- > arch/x86/mm/hugetlbpage.c | 2 +- > mm/hugetlb.c | 10 +++++++--- > 6 files changed, 18 insertions(+), 34 deletions(-) > > diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c > index 4aa9534a45d7..050809e6f0a9 100644 > --- a/arch/arm64/mm/hugetlbpage.c > +++ b/arch/arm64/mm/hugetlbpage.c > @@ -441,22 +441,14 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma, > clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig); > } > > -static void __init add_huge_page_size(unsigned long size) > -{ > - if (size_to_hstate(size)) > - return; > - > - hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); > -} > - > static int __init hugetlbpage_init(void) > { > #ifdef CONFIG_ARM64_4K_PAGES > - add_huge_page_size(PUD_SIZE); > + hugetlb_add_hstate(ilog2(PUD_SIZE) - PAGE_SHIFT); > #endif > - add_huge_page_size(CONT_PMD_SIZE); > - add_huge_page_size(PMD_SIZE); > - add_huge_page_size(CONT_PTE_SIZE); > + 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; > } > diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c > index 166960ba1236..f46464ba6fb4 100644 > --- a/arch/powerpc/mm/hugetlbpage.c > +++ b/arch/powerpc/mm/hugetlbpage.c > @@ -584,8 +584,7 @@ static int __init add_huge_page_size(unsigned long long size) > if (!arch_hugetlb_valid_size(size)) > return -EINVAL; > > - if (!size_to_hstate(size)) > - hugetlb_add_hstate(shift - PAGE_SHIFT); > + hugetlb_add_hstate(shift - PAGE_SHIFT); > return 0; > } > > diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c > index bdf89d7eb714..beaa91941db8 100644 > --- a/arch/riscv/mm/hugetlbpage.c > +++ b/arch/riscv/mm/hugetlbpage.c > @@ -26,7 +26,7 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) > static __init int gigantic_pages_init(void) > { > /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */ > - if (IS_ENABLED(CONFIG_64BIT) && !size_to_hstate(1UL << PUD_SHIFT)) > + if (IS_ENABLED(CONFIG_64BIT)) > hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); > return 0; > } > diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c > index 5c29203fd460..8f619edc8f8c 100644 > --- a/arch/sparc/mm/init_64.c > +++ b/arch/sparc/mm/init_64.c > @@ -325,23 +325,12 @@ static void __update_mmu_tsb_insert(struct mm_struct *mm, unsigned long tsb_inde > } > > #ifdef CONFIG_HUGETLB_PAGE > -static void __init add_huge_page_size(unsigned long size) > -{ > - unsigned int order; > - > - if (size_to_hstate(size)) > - return; > - > - order = ilog2(size) - PAGE_SHIFT; > - hugetlb_add_hstate(order); > -} > - > static int __init hugetlbpage_init(void) > { > - add_huge_page_size(1UL << HPAGE_64K_SHIFT); > - add_huge_page_size(1UL << HPAGE_SHIFT); > - add_huge_page_size(1UL << HPAGE_256MB_SHIFT); > - add_huge_page_size(1UL << HPAGE_2GB_SHIFT); > + hugetlb_add_hstate(HPAGE_64K_SHIFT - PAGE_SHIFT); > + hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); > + hugetlb_add_hstate(HPAGE_256MB_SHIFT - PAGE_SHIFT); > + hugetlb_add_hstate(HPAGE_2GB_SHIFT - PAGE_SHIFT); > > return 0; > } > diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c > index dd3ed09f6c23..8a3f586e1217 100644 > --- a/arch/x86/mm/hugetlbpage.c > +++ b/arch/x86/mm/hugetlbpage.c > @@ -195,7 +195,7 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) > static __init int gigantic_pages_init(void) > { > /* With compaction or CMA we can allocate gigantic pages at runtime */ > - if (boot_cpu_has(X86_FEATURE_GBPAGES) && !size_to_hstate(1UL << PUD_SHIFT)) > + if (boot_cpu_has(X86_FEATURE_GBPAGES)) > hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); > return 0; > } > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index cd4ec07080fb..cc85b4f156ca 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -3116,8 +3116,7 @@ static int __init hugetlb_init(void) > } > > default_hstate_size = HPAGE_SIZE; > - if (!size_to_hstate(default_hstate_size)) > - hugetlb_add_hstate(HUGETLB_PAGE_ORDER); > + hugetlb_add_hstate(HUGETLB_PAGE_ORDER); > } > default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size)); > if (default_hstate_max_huge_pages) { > @@ -3155,7 +3154,6 @@ void __init hugetlb_add_hstate(unsigned int order) > unsigned long i; > > if (size_to_hstate(PAGE_SIZE << order)) { > - pr_warn("hugepagesz= specified twice, ignoring\n"); > return; > } > BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE); > @@ -3231,6 +3229,12 @@ static int __init hugepagesz_setup(char *s) > return 0; > } > > + if (size_to_hstate(size)) { > + pr_warn("HugeTLB: hugepagesz %s specified twice, ignoring\n", > + saved_s); > + return 0; > + } > + Not too familiar with the code but I'm a bit confused by this print. AFAICT this prints the warning when hugepagesz= refers to a hugepage that is already added via hugetlb_add_hstate, but there is a default hstate added here without the user specifying hugepagesz, no? Does that mean the warning prints if you specify this size? Maybe then clarify the message like: 'HugeTLB: hugepage size already supported: xxxxx' or 'HugeTLB: hugepage size xxxx specified twice or is default size, ignoring.' Or don't print anything if it's the default size. > hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); > return 1; > } > -- > 2.24.1 > >