Merge tag 'ras_core_for_v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RAS update from Borislav Petkov:
 "A single RAS change for 5.15:

   - Do not start processing MCEs logged early because the decoding
     chain is not up yet - delay that processing until everything is
     ready"

* tag 'ras_core_for_v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mce: Defer processing of early errors

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 0607ec4..da93215 100644 (file)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -265,6 +265,7 @@ enum mcp_flags {
        MCP_TIMESTAMP   = BIT(0),       /* log time stamp */
        MCP_UC          = BIT(1),       /* log uncorrected errors */
        MCP_DONTLOG     = BIT(2),       /* only clear, don't log */
+       MCP_QUEUE_LOG   = BIT(3),       /* only queue to genpool */
 };
 bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
 

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 22791aa..8cb7816 100644 (file)
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -817,7 +817,10 @@ log_it:
                if (mca_cfg.dont_log_ce && !mce_usable_address(&m))
                        goto clear_it;
 
-               mce_log(&m);
+               if (flags & MCP_QUEUE_LOG)
+                       mce_gen_pool_add(&m);
+               else
+                       mce_log(&m);
 
 clear_it:
                /*
@@ -1639,10 +1642,12 @@ static void __mcheck_cpu_init_generic(void)
                m_fl = MCP_DONTLOG;
 
        /*
-        * Log the machine checks left over from the previous reset.
+        * Log the machine checks left over from the previous reset. Log them
+        * only, do not start processing them. That will happen in mcheck_late_init()
+        * when all consumers have been registered on the notifier chain.
         */
        bitmap_fill(all_banks, MAX_NR_BANKS);
-       machine_check_poll(MCP_UC | m_fl, &all_banks);
+       machine_check_poll(MCP_UC | MCP_QUEUE_LOG | m_fl, &all_banks);
 
        cr4_set_bits(X86_CR4_MCE);