The patch titled
Subject: mm: move ``get_order_from_str()`` to internal.h
has been added to the -mm mm-unstable branch. Its filename is
mm-move-get_order_from_str-to-internalh.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-move-get_order_from_str-to-internalh.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: MaÃra Canal <mcanal@xxxxxxxxxx>
Subject: mm: move ``get_order_from_str()`` to internal.h
Date: Fri, 1 Nov 2024 13:54:07 -0300
In order to implement a kernel parameter similar to ``thp_anon=`` for
shmem, we'll need the function ``get_order_from_str()``.
Instead of duplicating the function, move the function to a shared
header, in which both mm/shmem.c and mm/huge_memory.c will be able to
use it.
Link: https://lkml.kernel.org/r/20241101165719.1074234-5-mcanal@xxxxxxxxxx
Signed-off-by: MaÃra Canal <mcanal@xxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Barry Song <baohua@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Lance Yang <ioworker0@xxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 38 +++++++++++++++-----------------------
mm/internal.h | 22 ++++++++++++++++++++++
2 files changed, 37 insertions(+), 23 deletions(-)
--- a/mm/huge_memory.c~mm-move-get_order_from_str-to-internalh
+++ a/mm/huge_memory.c
@@ -958,26 +958,6 @@ out:
}
__setup("transparent_hugepage=", setup_transparent_hugepage);
-static inline int get_order_from_str(const char *size_str)
-{
- unsigned long size;
- char *endptr;
- int order;
-
- size = memparse(size_str, &endptr);
-
- if (!is_power_of_2(size))
- goto err;
- order = get_order(size);
- if (BIT(order) & ~THP_ORDERS_ALL_ANON)
- goto err;
-
- return order;
-err:
- pr_err("invalid size %s in thp_anon boot parameter\n", size_str);
- return -EINVAL;
-}
-
static char str_dup[PAGE_SIZE] __initdata;
static int __init setup_thp_anon(char *str)
{
@@ -1007,10 +987,22 @@ static int __init setup_thp_anon(char *s
start_size = strsep(&subtoken, "-");
end_size = subtoken;
- start = get_order_from_str(start_size);
- end = get_order_from_str(end_size);
+ start = get_order_from_str(start_size, THP_ORDERS_ALL_ANON);
+ end = get_order_from_str(end_size, THP_ORDERS_ALL_ANON);
} else {
- start = end = get_order_from_str(subtoken);
+ start_size = end_size = subtoken;
+ start = end = get_order_from_str(subtoken,
+ THP_ORDERS_ALL_ANON);
+ }
+
+ if (start == -EINVAL) {
+ pr_err("invalid size %s in thp_anon boot parameter\n", start_size);
+ goto err;
+ }
+
+ if (end == -EINVAL) {
+ pr_err("invalid size %s in thp_anon boot parameter\n", end_size);
+ goto err;
}
if (start < 0 || end < 0 || start > end)
--- a/mm/internal.h~mm-move-get_order_from_str-to-internalh
+++ a/mm/internal.h
@@ -1291,6 +1291,28 @@ static inline bool alloc_zeroed(void)
&init_on_alloc);
}
+/*
+ * Parses a string with mem suffixes into its order. Useful to parse kernel
+ * parameters.
+ */
+static inline int get_order_from_str(const char *size_str,
+ unsigned long valid_orders)
+{
+ unsigned long size;
+ char *endptr;
+ int order;
+
+ size = memparse(size_str, &endptr);
+
+ if (!is_power_of_2(size))
+ return -EINVAL;
+ order = get_order(size);
+ if (BIT(order) & ~valid_orders)
+ return -EINVAL;
+
+ return order;
+}
+
enum {
/* mark page accessed */
FOLL_TOUCH = 1 << 16,
_
Patches currently in -mm which might be from mcanal@xxxxxxxxxx are
mm-fix-docs-for-the-kernel-parameter-thp_anon=.patch
mm-shmem-control-thp-support-through-the-kernel-command-line.patch
mm-move-get_order_from_str-to-internalh.patch
mm-shmem-override-mthp-shmem-default-with-a-kernel-parameter.patch
mm-huge_memory-use-strscpy-instead-of-strcpy.patch
