linux-kernel - [PATCH 4.19 094/118] x86/ldt: Remove unused variable in map_ldt

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Message-Id: <20181126105105.473322783@linuxfoundation.org>
Date:   Mon, 26 Nov 2018 11:51:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, peterz@...radead.org,
        boris.ostrovsky@...cle.com, jgross@...e.com, bhe@...hat.com,
        willy@...radead.org, linux-mm@...ck.org,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 094/118] x86/ldt: Remove unused variable in map_ldt_struct()

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

commit b082f2dd80612015cd6d9d84e52099734ec9a0e1 upstream

Splitting out the sanity check in map_ldt_struct() moved page table syncing
into a separate function, which made the pgd variable unused. Remove it.

[ tglx: Massaged changelog ]

Fixes: 9bae3197e15d ("x86/ldt: Split out sanity check in map_ldt_struct()")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Andy Lutomirski <luto@...nel.org>
Cc: bp@...en8.de
Cc: hpa@...or.com
Cc: dave.hansen@...ux.intel.com
Cc: peterz@...radead.org
Cc: boris.ostrovsky@...cle.com
Cc: jgross@...e.com
Cc: bhe@...hat.com
Cc: willy@...radead.org
Cc: linux-mm@...ck.org
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/20181026122856.66224-4-kirill.shutemov@linux.intel.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/kernel/ldt.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index 2a71ded9b13e..65590eee6289 100644
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -207,7 +207,6 @@ map_ldt_struct(struct mm_struct *mm, struct ldt_struct *ldt, int slot)
 	bool is_vmalloc;
 	spinlock_t *ptl;
 	int i, nr_pages;
-	pgd_t *pgd;
 
 	if (!static_cpu_has(X86_FEATURE_PTI))
 		return 0;
@@ -221,13 +220,6 @@ map_ldt_struct(struct mm_struct *mm, struct ldt_struct *ldt, int slot)
 	/* Check if the current mappings are sane */
 	sanity_check_ldt_mapping(mm);
 
-	/*
-	 * Did we already have the top level entry allocated?  We can't
-	 * use pgd_none() for this because it doens't do anything on
-	 * 4-level page table kernels.
-	 */
-	pgd = pgd_offset(mm, LDT_BASE_ADDR);
-
 	is_vmalloc = is_vmalloc_addr(ldt->entries);
 
 	nr_pages = DIV_ROUND_UP(ldt->nr_entries * LDT_ENTRY_SIZE, PAGE_SIZE);
-- 
2.17.1