From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: [patch 071/131] hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate Date: Wed, 03 Jun 2020 16:00:42 -0700 Message-ID: <20200603230042.C83PaAXtY%akpm@linux-foundation.org> References: <20200603155549.e041363450869eaae4c7f05b@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:43048 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725821AbgFCXAp (ORCPT ); Wed, 3 Jun 2020 19:00:45 -0400 In-Reply-To: <20200603155549.e041363450869eaae4c7f05b@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: akpm@linux-foundation.org, almasrymina@google.com, anders.roxell@linaro.org, aneesh.kumar@linux.ibm.com, aou@eecs.berkeley.edu, benh@kernel.crashing.org, borntraeger@de.ibm.com, cai@lca.pw, catalin.marinas@arm.com, christophe.leroy@c-s.fr, corbet@lwn.net, dave.hansen@linux.intel.com, davem@davemloft.net, gerald.schaefer@de.ibm.com, gor@linux.ibm.com, heiko.carstens@de.ibm.com, linux-mm@kvack.org, longpeng2@huawei.com, mike.kravetz@oracle.com, mingo@redhat.com, mm-commits@vger.kernel.org, nitesh@redhat.com, palmer@dabbelt.com, paul.walmsley@sifive.com, paulus@samba.org, peterx@redhat.com, rdunlap@infradead.org, sfr@canb.auug.org.au, tglx@linutronix.de, torvalds@linux-foundation.org, will@kernel.org From: Mike Kravetz Subject: hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate 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. [mike.kravetz@oracle.com: fix hugetlb initialization] Link: http://lkml.kernel.org/r/4c36c6ce-3774-78fa-abc4-b7346bf24348@oracle.com Link: http://lkml.kernel.org/r/20200428205614.246260-5-mike.kravetz@oracle.com Link: http://lkml.kernel.org/r/20200417185049.275845-4-mike.kravetz@oracle.com Link: http://lkml.kernel.org/r/20200428205614.246260-4-mike.kravetz@oracle.com Signed-off-by: Mike Kravetz Acked-by: Mina Almasry Acked-by: Gerald Schaefer [s390] Acked-by: Will Deacon Tested-by: Anders Roxell Cc: Albert Ou Cc: Benjamin Herrenschmidt Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Christophe Leroy Cc: Dave Hansen Cc: David S. Miller Cc: Heiko Carstens Cc: Ingo Molnar Cc: Jonathan Corbet Cc: Longpeng Cc: Nitesh Narayan Lal Cc: Palmer Dabbelt Cc: Paul Mackerras Cc: Paul Walmsley Cc: Peter Xu Cc: Randy Dunlap Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: "Aneesh Kumar K.V" Cc: Qian Cai Cc: Stephen Rothwell Signed-off-by: Andrew Morton --- 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 | 9 ++++++--- 6 files changed, 17 insertions(+), 34 deletions(-) --- a/arch/arm64/mm/hugetlbpage.c~hugetlbfs-remove-hugetlb_add_hstate-warning-for-existing-hstate +++ a/arch/arm64/mm/hugetlbpage.c @@ -443,22 +443,14 @@ void huge_ptep_clear_flush(struct vm_are 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(PUD_SHIFT - 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((CONT_PMD_SHIFT + PMD_SHIFT) - PAGE_SHIFT); + hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate((CONT_PTE_SHIFT + PAGE_SHIFT) - PAGE_SHIFT); return 0; } --- a/arch/powerpc/mm/hugetlbpage.c~hugetlbfs-remove-hugetlb_add_hstate-warning-for-existing-hstate +++ a/arch/powerpc/mm/hugetlbpage.c @@ -584,8 +584,7 @@ static int __init add_huge_page_size(uns if (!arch_hugetlb_valid_size((unsigned long)size)) return -EINVAL; - if (!size_to_hstate(size)) - hugetlb_add_hstate(shift - PAGE_SHIFT); + hugetlb_add_hstate(shift - PAGE_SHIFT); return 0; } --- a/arch/riscv/mm/hugetlbpage.c~hugetlbfs-remove-hugetlb_add_hstate-warning-for-existing-hstate +++ a/arch/riscv/mm/hugetlbpage.c @@ -26,7 +26,7 @@ bool __init arch_hugetlb_valid_size(unsi 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; } --- a/arch/sparc/mm/init_64.c~hugetlbfs-remove-hugetlb_add_hstate-warning-for-existing-hstate +++ a/arch/sparc/mm/init_64.c @@ -325,23 +325,12 @@ static void __update_mmu_tsb_insert(stru } #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; } --- a/arch/x86/mm/hugetlbpage.c~hugetlbfs-remove-hugetlb_add_hstate-warning-for-existing-hstate +++ a/arch/x86/mm/hugetlbpage.c @@ -195,7 +195,7 @@ bool __init arch_hugetlb_valid_size(unsi 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; } --- a/mm/hugetlb.c~hugetlbfs-remove-hugetlb_add_hstate-warning-for-existing-hstate +++ a/mm/hugetlb.c @@ -3222,8 +3222,7 @@ 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) { @@ -3268,7 +3267,6 @@ void __init hugetlb_add_hstate(unsigned 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); @@ -3343,6 +3341,11 @@ static int __init hugepagesz_setup(char return 0; } + if (size_to_hstate(size)) { + pr_warn("HugeTLB: hugepagesz %s specified twice, ignoring\n", s); + return 0; + } + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); return 1; } _