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From:   Mike Kravetz <mike.kravetz@oracle.com>
To:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
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Cc:     Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
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        Albert Ou <aou@eecs.berkeley.edu>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        "David S . Miller" <davem@davemloft.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Longpeng <longpeng2@huawei.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Kravetz <mike.kravetz@oracle.com>
Subject: [PATCH 2/4] hugetlbfs: move hugepagesz= parsing to arch independent code
Date:   Wed, 18 Mar 2020 15:06:32 -0700
Message-Id: <20200318220634.32100-3-mike.kravetz@oracle.com>
In-Reply-To: <20200318220634.32100-1-mike.kravetz@oracle.com>
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Now that architectures provide arch_hugetlb_valid_size(), parsing
of "hugepagesz=" can be done in architecture independent code.
Create a single routine to handle hugepagesz= parsing and remove
all arch specific routines.  We can also remove the interface
hugetlb_bad_size() as this is no longer used outside arch independent
code.

This also provides consistent behavior of hugetlbfs command line
options.  The hugepagesz= option should only be specified once for
a specific size, but some architectures allow multiple instances.
This appears to be more of an oversight when code was added by some
architectures to set up ALL huge pages sizes.

Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
---
 arch/arm64/mm/hugetlbpage.c   | 15 ---------------
 arch/powerpc/mm/hugetlbpage.c | 15 ---------------
 arch/riscv/mm/hugetlbpage.c   | 16 ----------------
 arch/s390/mm/hugetlbpage.c    | 18 ------------------
 arch/sparc/mm/init_64.c       | 22 ----------------------
 arch/x86/mm/hugetlbpage.c     | 16 ----------------
 include/linux/hugetlb.h       |  1 -
 mm/hugetlb.c                  | 24 ++++++++++++++++++------
 8 files changed, 18 insertions(+), 109 deletions(-)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index da30127086d0..4aa9534a45d7 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -476,18 +476,3 @@ bool __init arch_hugetlb_valid_size(unsigned long long size)
 
 	return false;
 }
-
-static __init int setup_hugepagesz(char *opt)
-{
-	unsigned long long ps = memparse(opt, &opt);
-
-	if arch_hugetlb_valid_size(ps)) {
-		add_huge_page_size(ps);
-		return 1;
-	}
-
-	hugetlb_bad_size();
-	pr_err("hugepagesz: Unsupported page size %llu K\n", ps >> 10);
-	return 0;
-}
-__setup("hugepagesz=", setup_hugepagesz);
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index b78f660252f3..166960ba1236 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -589,21 +589,6 @@ static int __init add_huge_page_size(unsigned long long size)
 	return 0;
 }
 
-static int __init hugepage_setup_sz(char *str)
-{
-	unsigned long long size;
-
-	size = memparse(str, &str);
-
-	if (add_huge_page_size(size) != 0) {
-		hugetlb_bad_size();
-		pr_err("Invalid huge page size specified(%llu)\n", size);
-	}
-
-	return 1;
-}
-__setup("hugepagesz=", hugepage_setup_sz);
-
 static int __init hugetlbpage_init(void)
 {
 	bool configured = false;
diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
index f1990882f16c..bdf89d7eb714 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -22,22 +22,6 @@ bool __init arch_hugetlb_valid_size(unsigned long long size)
 		return false;
 }
 
-static __init int setup_hugepagesz(char *opt)
-{
-	unsigned long long ps = memparse(opt, &opt);
-
-	if (arch_hugetlb_valid_size(ps)) {
-		hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT);
-		return 1;
-	}
-
-	hugetlb_bad_size();
-	pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20);
-	return 0;
-
-}
-__setup("hugepagesz=", setup_hugepagesz);
-
 #ifdef CONFIG_CONTIG_ALLOC
 static __init int gigantic_pages_init(void)
 {
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index d92e8c5c3e71..b809762f206e 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -261,24 +261,6 @@ bool __init arch_hugetlb_valid_size(unsigned long long size)
 		return false;
 }
 
-static __init int setup_hugepagesz(char *opt)
-{
-	unsigned long long size;
-	char *string = opt;
-
-	size = memparse(opt, &opt);
-	if (arch_hugetlb_valid_size(size)) {
-		hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT);
-	} else {
-		hugetlb_bad_size();
-		pr_err("hugepagesz= specifies an unsupported page size %s\n",
-			string);
-		return 0;
-	}
-	return 1;
-}
-__setup("hugepagesz=", setup_hugepagesz);
-
 static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
 		unsigned long addr, unsigned long len,
 		unsigned long pgoff, unsigned long flags)
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 4cc248817b19..5c29203fd460 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -398,28 +398,6 @@ bool __init arch_hugetlb_valid_size(unsigned long long size)
 
 	return true;
 }
-
-static int __init setup_hugepagesz(char *string)
-{
-	unsigned long long hugepage_size;
-	int rc = 0;
-
-	hugepage_size = memparse(string, &string);
-
-	if (!arch_hugetlb_valid_size(hugepage_size)) {
-		hugetlb_bad_size();
-		pr_err("hugepagesz=%llu not supported by MMU.\n",
-			hugepage_size);
-		goto out;
-	}
-
-	add_huge_page_size(hugepage_size);
-	rc = 1;
-
-out:
-	return rc;
-}
-__setup("hugepagesz=", setup_hugepagesz);
 #endif	/* CONFIG_HUGETLB_PAGE */
 
 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index 51e6208fdeec..dd3ed09f6c23 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -191,22 +191,6 @@ bool __init arch_hugetlb_valid_size(unsigned long long size)
 		return false;
 }
 
-static __init int setup_hugepagesz(char *opt)
-{
-	unsigned long long ps = memparse(opt, &opt);
-
-	if (arch_hugetlb_valid_size(ps)) {
-		hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT);
-	} else {
-		hugetlb_bad_size();
-		printk(KERN_ERR "hugepagesz: Unsupported page size %llu M\n",
-			ps >> 20);
-		return 0;
-	}
-	return 1;
-}
-__setup("hugepagesz=", setup_hugepagesz);
-
 #ifdef CONFIG_CONTIG_ALLOC
 static __init int gigantic_pages_init(void)
 {
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 33343eb980d0..47244853ceb4 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -504,7 +504,6 @@ int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
 int __init __alloc_bootmem_huge_page(struct hstate *h);
 int __init alloc_bootmem_huge_page(struct hstate *h);
 
-void __init hugetlb_bad_size(void);
 void __init hugetlb_add_hstate(unsigned order);
 struct hstate *size_to_hstate(unsigned long size);
 
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2f99359b93af..cd4ec07080fb 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3149,12 +3149,6 @@ static int __init hugetlb_init(void)
 }
 subsys_initcall(hugetlb_init);
 
-/* Should be called on processing a hugepagesz=... option */
-void __init hugetlb_bad_size(void)
-{
-	parsed_valid_hugepagesz = false;
-}
-
 void __init hugetlb_add_hstate(unsigned int order)
 {
 	struct hstate *h;
@@ -3224,6 +3218,24 @@ static int __init hugetlb_nrpages_setup(char *s)
 }
 __setup("hugepages=", hugetlb_nrpages_setup);
 
+static int __init hugepagesz_setup(char *s)
+{
+	unsigned long long size;
+	char *saved_s = s;
+
+	size = memparse(s, &s);
+
+	if (!arch_hugetlb_valid_size(size)) {
+		parsed_valid_hugepagesz = false;
+		pr_err("HugeTLB: unsupported hugepagesz %s\n", saved_s);
+		return 0;
+	}
+
+	hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT);
+	return 1;
+}
+__setup("hugepagesz=", hugepagesz_setup);
+
 static int __init default_hugepagesz_setup(char *s)
 {
 	unsigned long long size;
-- 
2.24.1