diff options
| author | Maíra Canal <mcanal@igalia.com> | 2024-11-01 13:54:07 -0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-11-11 13:09:43 -0800 |
| commit | 1c8d48497525d77acfb7bdaaa246a887e754f379 (patch) | |
| tree | aa0f87929272af3b4e756bbe477730b3b2c21bd0 /mm/internal.h | |
| parent | 949042811117d2f437ef6b529a69d45e2ee2d429 (diff) | |
mm: move ``get_order_from_str()`` to internal.h
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>
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h index d5b93c5b6364..5a7302baeed7 100644 --- a/mm/internal.h +++ b/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, |