aboutsummaryrefslogtreecommitdiffstats
path: root/common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-mm-Remove-flush_tlb-and-flush_tlb_current_task.patch
diff options
context:
space:
mode:
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-mm-Remove-flush_tlb-and-flush_tlb_current_task.patch')
-rw-r--r--common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-mm-Remove-flush_tlb-and-flush_tlb_current_task.patch105
1 files changed, 105 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-mm-Remove-flush_tlb-and-flush_tlb_current_task.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-mm-Remove-flush_tlb-and-flush_tlb_current_task.patch
new file mode 100644
index 00000000..db1a2245
--- /dev/null
+++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-mm-Remove-flush_tlb-and-flush_tlb_current_task.patch
@@ -0,0 +1,105 @@
+From 0b113edb84e5133f4844eeec2889faced402a41c Mon Sep 17 00:00:00 2001
+From: Andy Lutomirski <luto@kernel.org>
+Date: Sat, 22 Apr 2017 00:01:20 -0700
+Subject: [PATCH 01/14] x86/mm: Remove flush_tlb() and flush_tlb_current_task()
+
+commit 29961b59a51f8c6838a26a45e871a7ed6771809b upstream.
+
+I was trying to figure out what how flush_tlb_current_task() would
+possibly work correctly if current->mm != current->active_mm, but I
+realized I could spare myself the effort: it has no callers except
+the unused flush_tlb() macro.
+
+Signed-off-by: Andy Lutomirski <luto@kernel.org>
+Cc: Andrew Morton <akpm@linux-foundation.org>
+Cc: Borislav Petkov <bp@alien8.de>
+Cc: Brian Gerst <brgerst@gmail.com>
+Cc: Dave Hansen <dave.hansen@intel.com>
+Cc: Denys Vlasenko <dvlasenk@redhat.com>
+Cc: H. Peter Anvin <hpa@zytor.com>
+Cc: Josh Poimboeuf <jpoimboe@redhat.com>
+Cc: Linus Torvalds <torvalds@linux-foundation.org>
+Cc: Michal Hocko <mhocko@suse.com>
+Cc: Nadav Amit <namit@vmware.com>
+Cc: Peter Zijlstra <peterz@infradead.org>
+Cc: Rik van Riel <riel@redhat.com>
+Cc: Thomas Gleixner <tglx@linutronix.de>
+Link: http://lkml.kernel.org/r/e52d64c11690f85e9f1d69d7b48cc2269cd2e94b.1492844372.git.luto@kernel.org
+Signed-off-by: Ingo Molnar <mingo@kernel.org>
+Cc: Hugh Dickins <hughd@google.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/x86/include/asm/tlbflush.h | 9 ---------
+ arch/x86/mm/tlb.c | 17 -----------------
+ 2 files changed, 26 deletions(-)
+
+diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
+index 183af59..db8952a 100644
+--- a/arch/x86/include/asm/tlbflush.h
++++ b/arch/x86/include/asm/tlbflush.h
+@@ -261,7 +261,6 @@ static inline void __flush_tlb_one(unsigned long addr)
+ /*
+ * TLB flushing:
+ *
+- * - flush_tlb() flushes the current mm struct TLBs
+ * - flush_tlb_all() flushes all processes TLBs
+ * - flush_tlb_mm(mm) flushes the specified mm context TLB's
+ * - flush_tlb_page(vma, vmaddr) flushes one page
+@@ -293,11 +292,6 @@ static inline void flush_tlb_all(void)
+ __flush_tlb_all();
+ }
+
+-static inline void flush_tlb(void)
+-{
+- __flush_tlb_up();
+-}
+-
+ static inline void local_flush_tlb(void)
+ {
+ __flush_tlb_up();
+@@ -359,14 +353,11 @@ static inline void flush_tlb_kernel_range(unsigned long start,
+ flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
+
+ extern void flush_tlb_all(void);
+-extern void flush_tlb_current_task(void);
+ extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
+ extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
+ unsigned long end, unsigned long vmflag);
+ extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
+
+-#define flush_tlb() flush_tlb_current_task()
+-
+ void native_flush_tlb_others(const struct cpumask *cpumask,
+ struct mm_struct *mm,
+ unsigned long start, unsigned long end);
+diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
+index 0cf44ac..c045051 100644
+--- a/arch/x86/mm/tlb.c
++++ b/arch/x86/mm/tlb.c
+@@ -320,23 +320,6 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
+ smp_call_function_many(cpumask, flush_tlb_func, &info, 1);
+ }
+
+-void flush_tlb_current_task(void)
+-{
+- struct mm_struct *mm = current->mm;
+-
+- preempt_disable();
+-
+- count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
+-
+- /* This is an implicit full barrier that synchronizes with switch_mm. */
+- local_flush_tlb();
+-
+- trace_tlb_flush(TLB_LOCAL_SHOOTDOWN, TLB_FLUSH_ALL);
+- if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
+- flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
+- preempt_enable();
+-}
+-
+ /*
+ * See Documentation/x86/tlb.txt for details. We choose 33
+ * because it is large enough to cover the vast majority (at
+--
+2.7.4
+