On Fri, 2015-07-17 at 18:18 -0700, David Miller wrote:
> From: Joe Perches <j...@perches.com> Date: Fri, 17 Jul 2015 16:07:02 -0700
> > On Fri, 2015-07-17 at 22:00 +0200, Sowmini Varadhan wrote:
> >> __vxlan_find_mac invokes ether_addr_equal on the eth_addr field,
> >> which triggers unaligned access messages, so rearrange vxlan_fdb
> >> to avoid this in the most non-intrusive way.
> > What arch does this?
> Sparc, MIPS, etc.
It seems that this code has had unaligned accesses
on this field even before compare_ether_addr was
converted to ether_addr_equal.
Is sparc64 the only one that emits / ratelimits that
unaligned access message? I looked a little, but I
didn't find a fixup message when MIPS does unaligned
accesses. Are all the other arches silent when
fixing up unaligned accesses? Maye adding a generic
debug only ratelimited message might help remove
more of these. As it's not fatal, naybe the sparc64
message should be KERN_DEBUG/pr_debug.
---
arch/sparc/kernel/unaligned_64.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/sparc/kernel/unaligned_64.c b/arch/sparc/kernel/unaligned_64.c
index 62098a8..6b7aeb7 100644
--- a/arch/sparc/kernel/unaligned_64.c
+++ b/arch/sparc/kernel/unaligned_64.c
@@ -294,13 +294,9 @@ static void kernel_mna_trap_fault(int fixup_tstate_asi)
static void log_unaligned(struct pt_regs *regs)
{
- static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
+ pr_debug_ratelimited("Kernel unaligned access at TPC[%lx] %pS\n",
+ regs->tpc, (void *)regs->tpc);
- if (__ratelimit(&ratelimit)) {
- printk("Kernel unaligned access at TPC[%lx] %pS\n",
- regs->tpc, (void *) regs->tpc);
- }
-}
asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
{
--
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