groups: simplify struct group_info allocation

Combine kmalloc and vmalloc into a single call.  Use struct_size macro
instead of direct size calculation.

Link: https://lkml.kernel.org/r/ba9ba5beea9a44b7196c41a0d9528abd5f20dd2e.1611620846.git.hubert.jasudowicz@gmail.com
Signed-off-by: Hubert Jasudowicz <hubert.jasudowicz@gmail.com>
Cc: Gao Xiang <xiang@kernel.org>
Cc: Micah Morton <mortonm@chromium.org>
Cc: Michael Kelley <mikelley@microsoft.com>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Thomas Cedeno <thomascedeno@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/groups.c b/kernel/groups.c
index fe7e638..787b381 100644 (file)
--- a/kernel/groups.c
+++ b/kernel/groups.c
@@ -15,12 +15,7 @@
 struct group_info *groups_alloc(int gidsetsize)
 {
        struct group_info *gi;
-       unsigned int len;
-
-       len = sizeof(struct group_info) + sizeof(kgid_t) * gidsetsize;
-       gi = kmalloc(len, GFP_KERNEL_ACCOUNT|__GFP_NOWARN|__GFP_NORETRY);
-       if (!gi)
-               gi = __vmalloc(len, GFP_KERNEL_ACCOUNT);
+       gi = kvmalloc(struct_size(gi, gid, gidsetsize), GFP_KERNEL_ACCOUNT);
        if (!gi)
                return NULL;