linux-kernel - [tip:x86/urgent] x86/ldt: Remove unused variable in map_ldt

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Date:   Tue, 6 Nov 2018 12:40:59 -0800
From:   "tip-bot for Kirill A. Shutemov" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, hpa@...or.com, mingo@...nel.org,
        kirill.shutemov@...ux.intel.com, linux-kernel@...r.kernel.org,
        luto@...nel.org
Subject: [tip:x86/urgent] x86/ldt: Remove unused variable in
 map_ldt_struct()

Commit-ID:  b082f2dd80612015cd6d9d84e52099734ec9a0e1
Gitweb:     https://git.kernel.org/tip/b082f2dd80612015cd6d9d84e52099734ec9a0e1
Author:     Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
AuthorDate: Fri, 26 Oct 2018 15:28:56 +0300
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 6 Nov 2018 21:35:11 +0100

x86/ldt: Remove unused variable in map_ldt_struct()

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

---
 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 18e4525c5933..6135ae8ce036 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);