From: Hubert Jasudowicz <redacted>
Subject: 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 <redacted>
Cc: Gao Xiang <xiang@kernel.org>
Cc: Micah Morton <mortonm@chromium.org>
Cc: Michael Kelley <redacted>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Thomas Cedeno <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/groups.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/kernel/groups.c~groups-simplify-struct-group_info-allocation
+++ a/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;
 

_