linux-kernel - linux-next: manual merge of the rcu tree with the tip tree

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Date:   Fri, 26 Jun 2020 13:14:25 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     "Paul E. McKenney" <paulmck@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: linux-next: manual merge of the rcu tree with the tip tree

Hi all,

Today's linux-next merge of the rcu tree got a conflict in:

  include/linux/compiler.h

between commit:

  1d8fcbb76bb1 ("compiler.h: Move instrumentation_begin()/end() into new <linux/instrumentation.h> header")

from the tip tree and commit:

  3b9946ebaf2b ("rcu: Fixup noinstr warnings")

from the rcu tree.

I fixed it up (I used the tip version and added the following patch) and
can carry the fix as necessary. This is now fixed as far as linux-next
is concerned, but any non trivial conflicts should be mentioned to your
upstream maintainer when your tree is submitted for merging.  You may
also want to consider cooperating with the maintainer of the conflicting
tree to minimise any particularly complex conflicts.

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Fri, 26 Jun 2020 13:02:03 +1000
Subject: [PATCH] merge fix for "rcu: Fixup noinstr warnings"

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 include/linux/instrumentation.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/instrumentation.h b/include/linux/instrumentation.h
index 19cba99342c2..83d9a3c5204f 100644
--- a/include/linux/instrumentation.h
+++ b/include/linux/instrumentation.h
@@ -6,7 +6,7 @@
 
 /* Begin/end of an instrumentation safe region */
 #define instrumentation_begin() ({					\
-	asm volatile("%c0:\n\t"						\
+	asm volatile("%c0: nop\n\t"					\
 		     ".pushsection .discard.instr_begin\n\t"		\
 		     ".long %c0b - .\n\t"				\
 		     ".popsection\n\t" : : "i" (__COUNTER__));		\
-- 
2.27.0

-- 
Cheers,
Stephen Rothwell

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