4.4-stable review patch. If anyone has any objections, please let me know.
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From: Andy Lutomirski luto@kernel.org
commit e1074888c326038340a1ada9129d679e661f2ea6 upstream.
Currently all of the functions that live in tlb.c are inlined on !SMP builds. One can debate whether this is a good idea (in many respects the code in tlb.c is better than the inlined UP code).
Regardless, I want to add code that needs to be built on UP and SMP kernels and relates to tlb flushing, so arrange for tlb.c to be compiled unconditionally.
Signed-off-by: Andy Lutomirski luto@kernel.org Reviewed-by: Borislav Petkov bp@suse.de Cc: Borislav Petkov bp@alien8.de Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Link: http://lkml.kernel.org/r/f0d778f0d828fc46e5d1946bca80f0aaf9abf032.1461688545... Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/mm/Makefile | 3 +-- arch/x86/mm/tlb.c | 4 ++++ 2 files changed, 5 insertions(+), 2 deletions(-)
--- a/arch/x86/mm/Makefile +++ b/arch/x86/mm/Makefile @@ -1,5 +1,5 @@ obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o pageattr.o mmap.o \ - pat.o pgtable.o physaddr.o gup.o setup_nx.o + pat.o pgtable.o physaddr.o gup.o setup_nx.o tlb.o
# Make sure __phys_addr has no stackprotector nostackp := $(call cc-option, -fno-stack-protector) @@ -9,7 +9,6 @@ CFLAGS_setup_nx.o := $(nostackp) CFLAGS_fault.o := -I$(src)/../include/asm/trace
obj-$(CONFIG_X86_PAT) += pat_rbtree.o -obj-$(CONFIG_SMP) += tlb.o
obj-$(CONFIG_X86_32) += pgtable_32.o iomap_32.o
--- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -28,6 +28,8 @@ * Implement flush IPI by CALL_FUNCTION_VECTOR, Alex Shi */
+#ifdef CONFIG_SMP + struct flush_tlb_info { struct mm_struct *flush_mm; unsigned long flush_start; @@ -351,3 +353,5 @@ static int __init create_tlb_single_page return 0; } late_initcall(create_tlb_single_page_flush_ceiling); + +#endif /* CONFIG_SMP */