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From: Stephen Rothwell <sfr@canb.auug.org.au>
To: David Miller <davem@davemloft.net>, Networking <netdev@vger.kernel.org>
Cc: Linux Next Mailing List <linux-next@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	PowerPC <linuxppc-dev@lists.ozlabs.org>
Subject: linux-next: build warning after merge of the net-next tree
Date: Mon, 11 Nov 2019 12:39:22 +1100
Message-ID: <20191111123922.540319a2@canb.auug.org.au> (raw)

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Hi all,

After merging the net-next tree, today's linux-next build (powerpc
ppc64_defconfig) produced this warning:

In file included from ./arch/powerpc/include/generated/asm/local64.h:1,
                 from include/linux/u64_stats_sync.h:72,
                 from include/linux/cgroup-defs.h:20,
                 from include/linux/cgroup.h:28,
                 from include/linux/memcontrol.h:13,
                 from include/linux/swap.h:9,
                 from include/linux/suspend.h:5,
                 from arch/powerpc/kernel/asm-offsets.c:23:
include/linux/u64_stats_sync.h: In function 'u64_stats_read':
include/asm-generic/local64.h:30:37: warning: passing argument 1 of 'local_read' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
   30 | #define local64_read(l)  local_read(&(l)->a)
      |                                     ^~~~~~~
include/linux/u64_stats_sync.h:80:9: note: in expansion of macro 'local64_read'
   80 |  return local64_read(&p->v);
      |         ^~~~~~~~~~~~
In file included from include/asm-generic/local64.h:22,
                 from ./arch/powerpc/include/generated/asm/local64.h:1,
                 from include/linux/u64_stats_sync.h:72,
                 from include/linux/cgroup-defs.h:20,
                 from include/linux/cgroup.h:28,
                 from include/linux/memcontrol.h:13,
                 from include/linux/swap.h:9,
                 from include/linux/suspend.h:5,
                 from arch/powerpc/kernel/asm-offsets.c:23:
arch/powerpc/include/asm/local.h:20:44: note: expected 'local_t *' {aka 'struct <anonymous> *'} but argument is of type 'const local_t *' {aka 'const struct <anonymous> *'}
   20 | static __inline__ long local_read(local_t *l)
      |                                   ~~~~~~~~~^

Introduced by commit

  316580b69d0a ("u64_stats: provide u64_stats_t type")

Powerpc folks: is there some reason that local_read() cannot take a
const argument?

I have added this patch (which builds fine) for today:

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Mon, 11 Nov 2019 12:32:24 +1100
Subject: [PATCH] powerpc: local_read() should take a const local_t argument

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
 arch/powerpc/include/asm/local.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h
index fdd00939270b..bc4bd19b7fc2 100644
--- a/arch/powerpc/include/asm/local.h
+++ b/arch/powerpc/include/asm/local.h
@@ -17,7 +17,7 @@ typedef struct
 
 #define LOCAL_INIT(i)	{ (i) }
 
-static __inline__ long local_read(local_t *l)
+static __inline__ long local_read(const local_t *l)
 {
 	return READ_ONCE(l->v);
 }
-- 
2.23.0

-- 
Cheers,
Stephen Rothwell

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             reply index

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-11  1:39 Stephen Rothwell [this message]
2019-11-11  1:45 ` Eric Dumazet
  -- strict thread matches above, loose matches on Subject: below --
2019-11-11  1:19 Stephen Rothwell
2019-11-11 10:24 ` Russell King - ARM Linux admin
2019-10-07 22:42 Stephen Rothwell
2019-10-09 12:24 ` David Howells
2019-07-08  3:25 Stephen Rothwell
2019-05-23 23:47 Stephen Rothwell
2019-04-23  1:32 Stephen Rothwell
2019-04-16  1:20 Stephen Rothwell
2019-04-16 10:03 ` John Hurley
2019-03-21 23:05 Stephen Rothwell
2019-03-21 23:10 ` Florian Fainelli
2019-02-22  1:06 Stephen Rothwell
2019-02-22  1:10 ` Florian Fainelli
2019-02-13  0:51 Stephen Rothwell
2019-02-13  0:58 ` Florian Fainelli
2019-02-13  0:49 Stephen Rothwell
2019-02-13  0:57 ` Florian Fainelli
2019-02-03 23:44 Stephen Rothwell
2019-02-04  4:26 ` David Miller
2019-02-04  4:32   ` Stephen Rothwell
2018-11-29  0:24 Stephen Rothwell
2018-12-19  2:42 ` Stephen Rothwell
2018-12-19  3:07   ` Gustavo A. R. Silva
2018-12-19  5:37     ` Stephen Rothwell
2018-07-19  2:04 Stephen Rothwell
2018-07-19  3:52 ` Guenter Roeck
2018-07-19  5:29   ` Stephen Rothwell
2018-07-19 13:49     ` Guenter Roeck
2018-07-19 22:09       ` Stephen Rothwell
2018-07-19 22:35         ` Guenter Roeck
2018-07-19 23:19           ` Masahiro Yamada
2018-07-19 23:37             ` Guenter Roeck
2018-08-14  7:05             ` Masahiro Yamada
2018-08-14 13:28               ` Guenter Roeck
2018-07-20  1:06           ` Stephen Rothwell
2018-07-19  1:40 Stephen Rothwell
2018-07-20 20:31 ` Linus Walleij
2018-07-05 23:56 Stephen Rothwell
2018-07-07 11:30 ` David Miller
2018-07-07 12:03   ` Stephen Rothwell
2018-05-29  3:10 Stephen Rothwell
2018-03-13  6:11 Stephen Rothwell
2018-03-13 11:46 ` Gustavo A. R. Silva
2018-03-13 15:33   ` David Miller
2018-03-13 20:28     ` Gustavo A. R. Silva
2018-01-18  1:20 Stephen Rothwell
2017-12-04  0:02 Stephen Rothwell
2017-12-04  6:33 ` Heiner Kallweit
2017-12-04 18:21 ` David Miller
2017-11-15  5:01 Stephen Rothwell
2016-12-09  0:34 Stephen Rothwell
2016-11-16  0:36 Stephen Rothwell
2016-11-16  0:56 ` Martin KaFai Lau
2016-07-27  6:15 Stephen Rothwell
2016-07-27  6:19 ` David Miller
2016-07-27  6:35   ` Stephen Rothwell
2016-07-27  6:45     ` Iyappan Subramanian
2016-07-11  6:13 Stephen Rothwell
2016-07-11  8:16 ` Simon Horman
2016-07-04  3:15 Stephen Rothwell
2016-07-04  5:19 ` Jason Wang
2016-02-15  2:09 Stephen Rothwell
2016-02-15  8:01 ` Nikolay Borisov
2014-05-15  6:47 Stephen Rothwell
2014-05-15 17:39 ` Cong Wang
2014-05-15 17:43   ` David Miller
2014-05-15 18:36     ` Cong Wang
2014-01-06  4:53 Stephen Rothwell
2013-08-21  9:10 Stephen Rothwell
2013-08-21 18:15 ` David Miller
2013-02-18  6:00 Stephen Rothwell
2012-04-23  6:54 Stephen Rothwell
2012-04-23  7:22 ` David Miller

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