From 684f978347deb42d180373ac4c427f82ef963171 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Fri, 29 Sep 2006 01:59:06 -0700 Subject: [PATCH] [PATCH] Let WARN_ON/WARN_ON_ONCE return the condition Letting WARN_ON/WARN_ON_ONCE return the condition means that you could do if (WARN_ON(blah)) { handle_impossible_case } Rather than if (unlikely(blah)) { WARN_ON(1) handle_impossible_case } I checked all the newly added WARN_ON_ONCE users and none of them test the return status so we can still change it. [akpm@osdl.org: warning fix] [akpm@osdl.org: build fix] Signed-off-by: Herbert Xu Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-generic/bug.h | 32 ++++++++++++++++---------------- include/asm-powerpc/bug.h | 12 +++++++----- 2 files changed, 23 insertions(+), 21 deletions(-) diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h index 8ceab7bcd8b4..a5250895155e 100644 --- a/include/asm-generic/bug.h +++ b/include/asm-generic/bug.h @@ -16,12 +16,15 @@ #endif #ifndef HAVE_ARCH_WARN_ON -#define WARN_ON(condition) do { \ - if (unlikely((condition)!=0)) { \ - printk("BUG: warning at %s:%d/%s()\n", __FILE__, __LINE__, __FUNCTION__); \ - dump_stack(); \ - } \ -} while (0) +#define WARN_ON(condition) ({ \ + typeof(condition) __ret_warn_on = (condition); \ + if (unlikely(__ret_warn_on)) { \ + printk("BUG: warning at %s:%d/%s()\n", __FILE__, \ + __LINE__, __FUNCTION__); \ + dump_stack(); \ + } \ + unlikely(__ret_warn_on); \ +}) #endif #else /* !CONFIG_BUG */ @@ -34,21 +37,18 @@ #endif #ifndef HAVE_ARCH_WARN_ON -#define WARN_ON(condition) do { if (condition) ; } while(0) +#define WARN_ON(condition) unlikely((condition)) #endif #endif -#define WARN_ON_ONCE(condition) \ -({ \ +#define WARN_ON_ONCE(condition) ({ \ static int __warn_once = 1; \ - int __ret = 0; \ + typeof(condition) __ret_warn_once = (condition);\ \ - if (unlikely((condition) && __warn_once)) { \ - __warn_once = 0; \ - WARN_ON(1); \ - __ret = 1; \ - } \ - __ret; \ + if (likely(__warn_once)) \ + if (WARN_ON(__ret_warn_once)) \ + __warn_once = 0; \ + unlikely(__ret_warn_once); \ }) #ifdef CONFIG_SMP diff --git a/include/asm-powerpc/bug.h b/include/asm-powerpc/bug.h index f44b529e3298..978b2c7e84ea 100644 --- a/include/asm-powerpc/bug.h +++ b/include/asm-powerpc/bug.h @@ -70,9 +70,10 @@ struct bug_entry *find_bug(unsigned long bugaddr); "i" (__FILE__), "i" (__FUNCTION__)); \ } while (0) -#define WARN_ON(x) do { \ - if (__builtin_constant_p(x)) { \ - if (x) \ +#define WARN_ON(x) ({ \ + typeof(x) __ret_warn_on = (x); \ + if (__builtin_constant_p(__ret_warn_on)) { \ + if (__ret_warn_on) \ __WARN(); \ } else { \ __asm__ __volatile__( \ @@ -80,11 +81,12 @@ struct bug_entry *find_bug(unsigned long bugaddr); ".section __bug_table,\"a\"\n" \ "\t"PPC_LONG" 1b,%1,%2,%3\n" \ ".previous" \ - : : "r" ((long)(x)), \ + : : "r" (__ret_warn_on), \ "i" (__LINE__ + BUG_WARNING_TRAP), \ "i" (__FILE__), "i" (__FUNCTION__)); \ } \ -} while (0) + unlikely(__ret_warn_on); \ +}) #define HAVE_ARCH_BUG #define HAVE_ARCH_BUG_ON -- 2.39.5