4.19-stable review patch. If anyone has any objections, please let me know.
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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@linux.intel.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Reviewed-by: Andy Lutomirski luto@kernel.org Cc: bp@alien8.de Cc: hpa@zytor.com Cc: dave.hansen@linux.intel.com Cc: peterz@infradead.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Cc: bhe@redhat.com Cc: willy@infradead.org Cc: linux-mm@kvack.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20181026122856.66224-4-kirill.shutemov@linux.intel... Signed-off-by: Sasha Levin sashal@kernel.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);