diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Make-flush_tlb_mm_range-more-predictable.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Make-flush_tlb_mm_range-more-predictable.patch | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Make-flush_tlb_mm_range-more-predictable.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Make-flush_tlb_mm_range-more-predictable.patch deleted file mode 100644 index 125c9159..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Make-flush_tlb_mm_range-more-predictable.patch +++ /dev/null @@ -1,83 +0,0 @@ -From d7185b4bc1a4bb697f514e447697bd535979dac3 Mon Sep 17 00:00:00 2001 -From: Andy Lutomirski <luto@kernel.org> -Date: Sat, 22 Apr 2017 00:01:21 -0700 -Subject: [PATCH 02/14] x86/mm: Make flush_tlb_mm_range() more predictable - -commit ce27374fabf553153c3f53efcaa9bfab9216bd8c upstream. - -I'm about to rewrite the function almost completely, but first I -want to get a functional change out of the way. Currently, if -flush_tlb_mm_range() does not flush the local TLB at all, it will -never do individual page flushes on remote CPUs. This seems to be -an accident, and preserving it will be awkward. Let's change it -first so that any regressions in the rewrite will be easier to -bisect and so that the rewrite can attempt to change no visible -behavior at all. - -The fix is simple: we can simply avoid short-circuiting the -calculation of base_pages_to_flush. - -As a side effect, this also eliminates a potential corner case: if -tlb_single_page_flush_ceiling == TLB_FLUSH_ALL, flush_tlb_mm_range() -could have ended up flushing the entire address space one page at a -time. - -Signed-off-by: Andy Lutomirski <luto@kernel.org> -Acked-by: Dave Hansen <dave.hansen@intel.com> -Cc: Andrew Morton <akpm@linux-foundation.org> -Cc: Borislav Petkov <bp@alien8.de> -Cc: Brian Gerst <brgerst@gmail.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/4b29b771d9975aad7154c314534fec235618175a.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/mm/tlb.c | 12 +++++++----- - 1 file changed, 7 insertions(+), 5 deletions(-) - -diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c -index c045051..2f9d41f 100644 ---- a/arch/x86/mm/tlb.c -+++ b/arch/x86/mm/tlb.c -@@ -340,6 +340,12 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, - unsigned long base_pages_to_flush = TLB_FLUSH_ALL; - - preempt_disable(); -+ -+ if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB)) -+ base_pages_to_flush = (end - start) >> PAGE_SHIFT; -+ if (base_pages_to_flush > tlb_single_page_flush_ceiling) -+ base_pages_to_flush = TLB_FLUSH_ALL; -+ - if (current->active_mm != mm) { - /* Synchronize with switch_mm. */ - smp_mb(); -@@ -356,15 +362,11 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, - goto out; - } - -- if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB)) -- base_pages_to_flush = (end - start) >> PAGE_SHIFT; -- - /* - * Both branches below are implicit full barriers (MOV to CR or - * INVLPG) that synchronize with switch_mm. - */ -- if (base_pages_to_flush > tlb_single_page_flush_ceiling) { -- base_pages_to_flush = TLB_FLUSH_ALL; -+ if (base_pages_to_flush == TLB_FLUSH_ALL) { - count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL); - local_flush_tlb(); - } else { --- -2.7.4 - |