linux-kernel - [PATCH v2] powerpc/setup_64: fix -Wempty-body warnings

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Message-Id: <1559768018-7665-1-git-send-email-cai@lca.pw>
Date:   Wed,  5 Jun 2019 16:53:38 -0400
From:   Qian Cai <cai@....pw>
To:     mpe@...erman.id.au
Cc:     paulus@...ba.org, benh@...nel.crashing.org,
        tyreld@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: [PATCH v2] powerpc/setup_64: fix -Wempty-body warnings

At the beginning of setup_64.c, it has,

  #ifdef DEBUG
  #define DBG(fmt...) udbg_printf(fmt)
  #else
  #define DBG(fmt...)
  #endif

where DBG() could be compiled away, and generate warnings,

arch/powerpc/kernel/setup_64.c: In function 'initialize_cache_info':
arch/powerpc/kernel/setup_64.c:579:49: warning: suggest braces around
empty body in an 'if' statement [-Wempty-body]
    DBG("Argh, can't find dcache properties !\n");
                                                 ^
arch/powerpc/kernel/setup_64.c:582:49: warning: suggest braces around
empty body in an 'if' statement [-Wempty-body]
    DBG("Argh, can't find icache properties !\n");

Suggested-by: Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
Signed-off-by: Qian Cai <cai@....pw>
---

v2: fix it by using a NOP while loop.

 arch/powerpc/kernel/setup_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 44b4c432a273..bed4ae8d338c 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -71,7 +71,7 @@
 #ifdef DEBUG
 #define DBG(fmt...) udbg_printf(fmt)
 #else
-#define DBG(fmt...)
+#define DBG(fmt...) do { } while (0)
 #endif
 
 int spinning_secondaries;
-- 
1.8.3.1