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linux-next/arch/mips/kvm
James Cowgill e27a9eca5d KVM: MIPS: Fix maybe-uninitialized build failure
This commit fixes a "maybe-uninitialized" build failure in
arch/mips/kvm/tlb.c when KVM, DYNAMIC_DEBUG and JUMP_LABEL are all
enabled. The failure is:

In file included from ./include/linux/printk.h:329:0,
                 from ./include/linux/kernel.h:13,
                 from ./include/asm-generic/bug.h:15,
                 from ./arch/mips/include/asm/bug.h:41,
                 from ./include/linux/bug.h:4,
                 from ./include/linux/thread_info.h:11,
                 from ./include/asm-generic/current.h:4,
                 from ./arch/mips/include/generated/asm/current.h:1,
                 from ./include/linux/sched.h:11,
                 from arch/mips/kvm/tlb.c:13:
arch/mips/kvm/tlb.c: In function ‘kvm_mips_host_tlb_inv’:
./include/linux/dynamic_debug.h:126:3: error: ‘idx_kernel’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
   __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
   ^~~~~~~~~~~~~~~~~~
arch/mips/kvm/tlb.c:169:16: note: ‘idx_kernel’ was declared here
  int idx_user, idx_kernel;
                ^~~~~~~~~~

There is a similar error relating to "idx_user". Both errors were
observed with GCC 6.

As far as I can tell, it is impossible for either idx_user or idx_kernel
to be uninitialized when they are later read in the calls to kvm_debug,
but to satisfy the compiler, add zero initializers to both variables.

Signed-off-by: James Cowgill <James.Cowgill@imgtec.com>
Fixes: 57e3869cfa ("KVM: MIPS/TLB: Generalise host TLB invalidate to kernel ASID")
Cc: <stable@vger.kernel.org> # 4.11+
Acked-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2017-06-20 17:02:48 +02:00
..
00README.txt KVM/MIPS32: Release notes and KVM module Makefile 2013-05-08 03:55:35 +02:00
callback.c MIPS: KVM: Convert EXPORT_SYMBOL to _GPL 2016-01-24 03:13:24 +01:00
commpage.c MIPS: kvm: Audit and remove any unnecessary uses of module.h 2016-10-05 01:31:20 +02:00
commpage.h MIPS: KVM: Rename files to remove the prefix "kvm_" and "kvm_mips_" 2014-06-30 16:52:03 +02:00
dyntrans.c KVM: MIPS/T&E: Use lockless GVA helpers for dyntrans 2017-02-03 15:21:12 +00:00
emulate.c KVM: add kvm_{test,clear}_request to replace {test,clear}_bit 2017-04-27 14:12:22 +02:00
entry.c KVM: MIPS/Entry: Update entry code to support VZ 2017-03-28 14:53:51 +01:00
fpu.S MIPS: KVM: Fix fpu.S misassembly with r6 2016-07-05 16:09:11 +02:00
hypcall.c KVM: MIPS: Implement HYPCALL emulation 2017-03-28 14:53:33 +01:00
interrupt.c KVM: MIPS/T&E: Implement CP0_EBase register 2017-02-03 15:21:30 +00:00
interrupt.h KVM: MIPS: Implement VZ support 2017-03-28 14:53:54 +01:00
Kconfig KVM: MIPS: Add VZ support to build system 2017-03-28 14:53:54 +01:00
Makefile KVM: MIPS: Add VZ support to build system 2017-03-28 14:53:54 +01:00
mips.c kvm: make KVM_CAP_COALESCED_MMIO architecture agnostic 2017-04-07 16:49:00 +02:00
mmu.c KVM: MIPS: Implement VZ support 2017-03-28 14:53:54 +01:00
msa.S MIPS: KVM: Add base guest MSA support 2015-03-27 21:25:19 +00:00
stats.c MIPS: KVM: Clean up kvm_exit trace event 2016-06-14 11:16:23 +02:00
tlb.c KVM: MIPS: Fix maybe-uninitialized build failure 2017-06-20 17:02:48 +02:00
trace.h KVM: MIPS/VZ: Trace guest mode changes 2017-03-28 14:54:00 +01:00
trap_emul.c KVM: MIPS/T&E: Report correct dcache line size 2017-03-28 15:36:18 +01:00
vz.c KVM: MIPS/VZ: Handle Octeon III guest.PRid register 2017-03-28 15:36:20 +01:00