[PATCH 2/2] x86: dumpstack: eliminate some #ifdefs

[Rasmus Villemoes <linux@rasmusvillemoes.dk>]

Jiri Slaby noted that these #ifdef protected printks should really be
pr_cont. However, we might as well get completely rid of both the
multiple printk calls and the tiny #ifdef sections by just building an
appropriate string and passing that to the first printk call.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
Mostly an example of how 1/2 can be used.

 arch/x86/kernel/dumpstack.c | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 9c30acfadae2..6ae7e65e734e 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -257,21 +257,16 @@ int __die(const char *str, struct pt_regs *regs, long err)
 	unsigned short ss;
 	unsigned long sp;
 #endif
+	static const char build_flags[] = ""
+		CHOOSE_EXPR(CONFIG_PREEMPT, " PREEMPT")
+		CHOOSE_EXPR(CONFIG_SMP, " SMP")
+		CHOOSE_EXPR(CONFIG_DEBUG_PAGEALLOC, " DEBUG_PAGEALLOC")
+		CHOOSE_EXPR(CONFIG_KASAN, " KASAN");
+
 	printk(KERN_DEFAULT
-	       "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
-#ifdef CONFIG_PREEMPT
-	printk("PREEMPT ");
-#endif
-#ifdef CONFIG_SMP
-	printk("SMP ");
-#endif
-#ifdef CONFIG_DEBUG_PAGEALLOC
-	printk("DEBUG_PAGEALLOC ");
-#endif
-#ifdef CONFIG_KASAN
-	printk("KASAN");
-#endif
-	printk("\n");
+	       "%s: %04lx [#%d]%s\n", str, err & 0xffff, ++die_counter,
+	       build_flags);
+
 	if (notify_die(DIE_OOPS, str, regs, err,
 			current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
 		return 1;
-- 
2.1.3