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mseal: remove can_do_mseal()

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No code logic change.

can_do_mseal() is called exclusively by mseal.c, and mseal.c is compiled
only when CONFIG_64BIT flag is set in makefile.  Therefore, it is
unnecessary to have 32 bit stub function in the header file, remove this
function and merge the logic into do_mseal().

Link: https://lkml.kernel.org/r/20241206013934.2782793-1-jeffxu@google.com
Link: https://lkml.kernel.org/r/20241206194839.3030596-2-jeffxu@google.com
Signed-off-by: Jeff Xu <jeffxu@chromium.org>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Jorge Lucangeli Obes <jorgelo@chromium.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jeff Xu 2024-12-06 19:48:39 +00:00 committed by Andrew Morton
parent cdd26c3a34
commit 6ca1836d63
2 changed files with 3 additions and 19 deletions
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16
mm/internal.h
View File

@ -1451,22 +1451,6 @@ void __meminit __init_single_page(struct page *page, unsigned long pfn,
unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg,
int priority);
#ifdef CONFIG_64BIT
static inline int can_do_mseal(unsigned long flags)
{
if (flags)
return -EINVAL;
return 0;
}
#else
static inline int can_do_mseal(unsigned long flags)
{
return -EPERM;
}
#endif
#ifdef CONFIG_SHRINKER_DEBUG
static inline __printf(2, 0) int shrinker_debugfs_name_alloc(
struct shrinker *shrinker, const char *fmt, va_list ap)

6
mm/mseal.c
View File

@ -217,9 +217,9 @@ int do_mseal(unsigned long start, size_t len_in, unsigned long flags)
unsigned long end;
struct mm_struct *mm = current->mm;
ret = can_do_mseal(flags);
if (ret)
return ret;
/* Verify flags not set. */
if (flags)
return -EINVAL;
start = untagged_addr(start);
if (!PAGE_ALIGNED(start))