linux-kernel - [tip:core/urgent] mm/early_ioremap: Fix boot hang with earlyprintk=efi,keep

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Date:   Tue, 12 Dec 2017 02:53:17 -0800
From:   tip-bot for Dave Young <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        tglx@...utronix.de, torvalds@...ux-foundation.org,
        mingo@...nel.org, dyoung@...hat.com, hpa@...or.com
Subject: [tip:core/urgent] mm/early_ioremap: Fix boot hang with
 earlyprintk=efi,keep

Commit-ID:  7f6f60a1ba52538c16f26930bfbcfe193d9d746a
Gitweb:     https://git.kernel.org/tip/7f6f60a1ba52538c16f26930bfbcfe193d9d746a
Author:     Dave Young <dyoung@...hat.com>
AuthorDate: Sat, 9 Dec 2017 12:16:10 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 11 Dec 2017 14:54:44 +0100

mm/early_ioremap: Fix boot hang with earlyprintk=efi,keep

earlyprintk=efi,keep does not work any more with a warning
in mm/early_ioremap.c: WARN_ON(system_state != SYSTEM_BOOTING):
Boot just hangs because of the earlyprintk within the earlyprintk
implementation code itself.

This is caused by a new introduced middle state in:

  69a78ff226fe ("init: Introduce SYSTEM_SCHEDULING state")

early_ioremap() is fine in both SYSTEM_BOOTING and SYSTEM_SCHEDULING
states, original condition should be updated accordingly.

Signed-off-by: Dave Young <dyoung@...hat.com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: bp@...e.de
Cc: linux-efi@...r.kernel.org
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/20171209041610.GA3249@dhcp-128-65.nay.redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 mm/early_ioremap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
index d04ac1e..1826f19 100644
--- a/mm/early_ioremap.c
+++ b/mm/early_ioremap.c
@@ -111,7 +111,7 @@ __early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
 	enum fixed_addresses idx;
 	int i, slot;
 
-	WARN_ON(system_state != SYSTEM_BOOTING);
+	WARN_ON(system_state >= SYSTEM_RUNNING);
 
 	slot = -1;
 	for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {