linux-kernel - [PATCH v2] powerpc: Add const qual to local

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Date:   Wed, 20 Nov 2019 12:14:51 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, davem@...emloft.net,
        edumazet@...gle.com, sfr@...b.auug.org.au, linuxppc-dev@...abs.org
Subject: [PATCH v2] powerpc: Add const qual to local_read() parameter

From: Eric Dumazet <edumazet@...gle.com>

A patch in net-next triggered a compile error on powerpc:

  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

This seems reasonable to relax powerpc local_read() requirements.

Fixes: 316580b69d0a ("u64_stats: provide u64_stats_t type")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: kbuild test robot <lkp@...el.com>
Acked-by: Michael Ellerman <mpe@...erman.id.au>
---
 arch/powerpc/include/asm/local.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

v2: mpe: Update change log with compiler warning, resend to netdev so it appears
in the netdev patchwork.

Dave can you take this in the net tree so the window of the breakage is as small
as possible please?

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);
 }
-- 
2.21.0