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mm: move `get_order_from_str()` to internal.h

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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@igalia.com
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Maíra Canal 2024-11-01 13:54:07 -03:00 committed by Andrew Morton
parent 9490428111
commit 1c8d484975
2 changed files with 37 additions and 23 deletions
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38
mm/huge_memory.c
View File

@ -958,26 +958,6 @@ static int __init setup_transparent_hugepage(char *str)
}
__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 *str)
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)

22
mm/internal.h
View File

@ -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,