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authorMike Kravetz <mike.kravetz@oracle.com>2020-06-04 02:00:34 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 06:09:46 +0300
commitae94da898133947c2d1f005da10838478e4548db (patch)
treec576d852af61eec71cb2e9760d03b322d221e9a7 /mm
parent71a2c112a0f6da497e1b44e18e97b1716c240518 (diff)
downloadlinux-ae94da898133947c2d1f005da10838478e4548db.tar.xz
hugetlbfs: add arch_hugetlb_valid_size
Patch series "Clean up hugetlb boot command line processing", v4. Longpeng(Mike) reported a weird message from hugetlb command line processing and proposed a solution [1]. While the proposed patch does address the specific issue, there are other related issues in command line processing. As hugetlbfs evolved, updates to command line processing have been made to meet immediate needs and not necessarily in a coordinated manner. The result is that some processing is done in arch specific code, some is done in arch independent code and coordination is problematic. Semantics can vary between architectures. The patch series does the following: - Define arch specific arch_hugetlb_valid_size routine used to validate passed huge page sizes. - Move hugepagesz= command line parsing out of arch specific code and into an arch independent routine. - Clean up command line processing to follow desired semantics and document those semantics. [1] https://lore.kernel.org/linux-mm/20200305033014.1152-1-longpeng2@huawei.com This patch (of 3): 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@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [s390] Acked-by: Will Deacon <will@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: David S. Miller <davem@davemloft.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Longpeng <longpeng2@huawei.com> Cc: Christophe Leroy <christophe.leroy@c-s.fr> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Mina Almasry <almasrymina@google.com> Cc: Peter Xu <peterx@redhat.com> Cc: Nitesh Narayan Lal <nitesh@redhat.com> Cc: Anders Roxell <anders.roxell@linaro.org> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> Cc: Qian Cai <cai@lca.pw> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Link: http://lkml.kernel.org/r/20200428205614.246260-1-mike.kravetz@oracle.com Link: http://lkml.kernel.org/r/20200428205614.246260-2-mike.kravetz@oracle.com Link: http://lkml.kernel.org/r/20200417185049.275845-1-mike.kravetz@oracle.com Link: http://lkml.kernel.org/r/20200417185049.275845-2-mike.kravetz@oracle.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/hugetlb.c21
1 files changed, 18 insertions, 3 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bcabbe02192b..63ca4241ea87 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3256,6 +3256,12 @@ static int __init hugetlb_init(void)
}
subsys_initcall(hugetlb_init);
+/* Overwritten by architectures with more huge page sizes */
+bool __init __attribute((weak)) arch_hugetlb_valid_size(unsigned long size)
+{
+ return size == HPAGE_SIZE;
+}
+
/* Should be called on processing a hugepagesz=... option */
void __init hugetlb_bad_size(void)
{
@@ -3331,12 +3337,21 @@ static int __init hugetlb_nrpages_setup(char *s)
}
__setup("hugepages=", hugetlb_nrpages_setup);
-static int __init hugetlb_default_setup(char *s)
+static int __init default_hugepagesz_setup(char *s)
{
- default_hstate_size = memparse(s, &s);
+ unsigned long size;
+
+ size = (unsigned long)memparse(s, NULL);
+
+ if (!arch_hugetlb_valid_size(size)) {
+ pr_err("HugeTLB: unsupported default_hugepagesz %s\n", s);
+ return 0;
+ }
+
+ default_hstate_size = size;
return 1;
}
-__setup("default_hugepagesz=", hugetlb_default_setup);
+__setup("default_hugepagesz=", default_hugepagesz_setup);
static unsigned int cpuset_mems_nr(unsigned int *array)
{