x86, MCE: Do not taint when handling correctable errors

Correctable errors are considered something rather normal on
modern hardware these days. Even more importantly, correctable
errors mean exactly that - they've been corrected by the
hardware - and there's no need to taint the kernel since
execution hasn't been compromised so far.

Also, drop tainting in the thermal throttling code for a similar
reason: crossing a thermal threshold does not mean corruption.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Acked-by: Nagananda Chumbalkar <Nagananda.Chumbalkar@hp.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Russ Anderson <rja@sgi.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1303135222-17118-1-git-send-email-bp@amd64.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 3385ea26f6841bea370faa9ea7baa08b3fda90f2..68e230327d65490ae6c57e3713438c0015d12cfb 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -590,7 +590,6 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
                if (!(flags & MCP_DONTLOG) && !mce_dont_log_ce) {
                        mce_log(&m);
                        atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, &m);
-                       add_taint(TAINT_MACHINE_CHECK);
                }
 
                /*

diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index 6f8c5e9da97f0f3e4c0ac89557a3b2f1c3a5f01e..5846a797b970bc49e10110dbca542c2ea3578dbe 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -187,8 +187,6 @@ static int therm_throt_process(bool new_event, int event, int level)
                                this_cpu,
                                level == CORE_LEVEL ? "Core" : "Package",
                                state->count);
-
-               add_taint(TAINT_MACHINE_CHECK);
                return 1;
        }
        if (old_event) {
@@ -393,7 +391,6 @@ static void unexpected_thermal_interrupt(void)
 {
        printk(KERN_ERR "CPU%d: Unexpected LVT thermal interrupt!\n",
                        smp_processor_id());
-       add_taint(TAINT_MACHINE_CHECK);
 }
 
 static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt;