linux-kernel - [PATCH 2/2] groups: Simplify struct group

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Message-Id: <ba9ba5beea9a44b7196c41a0d9528abd5f20dd2e.1611620846.git.hubert.jasudowicz@gmail.com>
Date:   Tue, 26 Jan 2021 02:37:16 +0100
From:   Hubert Jasudowicz <hubert.jasudowicz@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Micah Morton <mortonm@...omium.org>,
        Gao Xiang <xiang@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Thomas Cedeno <thomascedeno@...gle.com>
Subject: [PATCH 2/2] groups: Simplify struct group_info allocation

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

Signed-off-by: Hubert Jasudowicz <hubert.jasudowicz@...il.com>
---
 kernel/groups.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/groups.c b/kernel/groups.c
index fe7e6385530e..787b381c7c00 100644
--- 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;
 
-- 
2.30.0