[PATCH] printk: Make it compile with !CONFIG_PRINTK

Peter Zijlstra
2012-03-15T11:35:58Z

On Thu, 2012-03-15 at 07:19 +1100, Stephen Rothwell wrote:
> On Wed, 14 Mar 2012 08:56:22 -0700 Randy Dunlap <rdunlap@xenotime.net> wrote:
> >
> > on x86_64:
> >
> > kernel/printk.c:1230:5: error: redefinition of 'printk_sched'
> > include/linux/printk.h:136:5: note: previous definition of 'printk_sched' was here
>
> Caused by commit 3ccf3e830615 ("printk/sched: Introduce special
> printk_sched() for those awkward moments") from the tip tree. The
> declaration in include/linux/printk.h has alternatives determined by
> CONFIG_PRINTK, but the definition in kernel/printk.c is not so
> protected ...

Ingo, could you stick this on top.. ?

---
Subject: printk: Make it compile with !CONFIG_PRINTK

Commit 3ccf3e830615 ("printk/sched: Introduce special printk_sched() for
those awkward moments") overlooked an #ifdef, so move code around to
respect these directives.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
kernel/printk.c | 40 ++++++++++++++++++++--------------------
1 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/kernel/printk.c b/kernel/printk.c
index 8b6981e..b663c2c 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1227,26 +1227,6 @@ int is_console_locked(void)
static DEFINE_PER_CPU(int, printk_pending);
static DEFINE_PER_CPU(char [PRINTK_BUF_SIZE], printk_sched_buf);

-int printk_sched(const char *fmt, ...)
-{
- unsigned long flags;
- va_list args;
- char *buf;
- int r;
-
- local_irq_save(flags);
- buf = __get_cpu_var(printk_sched_buf);
-
- va_start(args, fmt);
- r = vsnprintf(buf, PRINTK_BUF_SIZE, fmt, args);
- va_end(args);
-
- __this_cpu_or(printk_pending, PRINTK_PENDING_SCHED);
- local_irq_restore(flags);
-
- return r;
-}
-
void printk_tick(void)
{
if (__this_cpu_read(printk_pending)) {
@@ -1663,6 +1643,26 @@ late_initcall(printk_late_init);

#if defined CONFIG_PRINTK

+int printk_sched(const char *fmt, ...)
+{
+ unsigned long flags;
+ va_list args;
+ char *buf;
+ int r;
+
+ local_irq_save(flags);
+ buf = __get_cpu_var(printk_sched_buf);
+
+ va_start(args, fmt);
+ r = vsnprintf(buf, PRINTK_BUF_SIZE, fmt, args);
+ va_end(args);
+
+ __this_cpu_or(printk_pending, PRINTK_PENDING_SCHED);
+ local_irq_restore(flags);
+
+ return r;
+}
+
/*
* printk rate limiting, lifted from the networking subsystem.
*