linux-kernel - [tip:x86/cleanups] x86/ldt: Make a size argument unsigned

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Date:   Sat, 10 Dec 2016 00:12:50 -0800
From:   tip-bot for Dan Carpenter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     aryabinin@...tuozzo.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, dave.hansen@...ux.intel.com,
        akpm@...ux-foundation.org, mingo@...nel.org, hpa@...or.com,
        dan.carpenter@...cle.com, luto@...nel.org
Subject: [tip:x86/cleanups] x86/ldt: Make a size argument unsigned

Commit-ID:  296dc5806de57dc84fce000d60fc201ba40f96e8
Gitweb:     http://git.kernel.org/tip/296dc5806de57dc84fce000d60fc201ba40f96e8
Author:     Dan Carpenter <dan.carpenter@...cle.com>
AuthorDate: Thu, 8 Dec 2016 13:56:03 +0300
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 10 Dec 2016 00:24:39 +0100

x86/ldt: Make a size argument unsigned

My static checker complains that we put an upper bound on the "size"
argument but not a lower bound.  The checker is not smart enough to know
the possible ranges of "old_mm->context.ldt->size" from
init_new_context_ldt() so it thinks maybe it could be negative.

Let's make it unsigned to silence the warning and future proof the code
a bit.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Andy Lutomirski <luto@...nel.org>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: kernel-janitors@...r.kernel.org
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Link: http://lkml.kernel.org/r/20161208105602.GA11382@elgon.mountain
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/kernel/ldt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index 6707039..e25b668 100644
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -34,7 +34,7 @@ static void flush_ldt(void *current_mm)
 }
 
 /* The caller must call finalize_ldt_struct on the result. LDT starts zeroed. */
-static struct ldt_struct *alloc_ldt_struct(int size)
+static struct ldt_struct *alloc_ldt_struct(unsigned int size)
 {
 	struct ldt_struct *new_ldt;
 	int alloc_size;