[PATCH] Add documentation to some preprocessor directives in init/*.c.

["Robert P. J. Day" <rpjday@mindspring.com>]

Add some documentation to potentially confusing preprocessor
directives in some source files in the init/ directory to show their
proper association and nesting.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>

---

  not all of them, just those that are sufficiently distant from their
initial tests or are nested, to make perusing the code easier.

 init/calibrate.c |    2 +-
 init/initramfs.c |    4 ++--
 init/main.c      |    6 +++---
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/init/calibrate.c b/init/calibrate.c
index 40ff3b4..783a907 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -101,7 +101,7 @@ static unsigned long __devinit calibrate_delay_direct(void)
 	       "estimate for loops_per_jiffy.\nProbably due to long platform interrupts. Consider using \"lpj=\" boot option.\n");
 	return 0;
 }
-#else
+#else /* !ARCH_HAS_READ_CURRENT_TIMER */
 static unsigned long __devinit calibrate_delay_direct(void) {return 0;}
 #endif

diff --git a/init/initramfs.c b/init/initramfs.c
index 1db02a0..2493c5b 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -539,7 +539,7 @@ skip:
 	initrd_end = 0;
 }

-#endif
+#endif /* CONFIG_BLK_DEV_INITRD */

 static int __init populate_rootfs(void)
 {
@@ -579,7 +579,7 @@ static int __init populate_rootfs(void)
 		free_initrd();
 #endif
 	}
-#endif
+#endif /* CONFIG_BLK_DEV_INITRD */
 	return 0;
 }
 rootfs_initcall(populate_rootfs);
diff --git a/init/main.c b/init/main.c
index 450e6ee..781b1fb 100644
--- a/init/main.c
+++ b/init/main.c
@@ -169,7 +169,7 @@ static int __init maxcpus(char *str)
 }

 early_param("maxcpus", maxcpus);
-#else
+#else /* !CONFIG_SMP */
 #define max_cpus NR_CPUS
 #endif

@@ -367,7 +367,7 @@ static void __init smp_init(void)
 static inline void setup_per_cpu_areas(void) { }
 static inline void smp_prepare_cpus(unsigned int maxcpus) { }

-#else
+#else /* CONFIG_SMP */

 #ifdef __GENERIC_PER_CPU
 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
@@ -414,7 +414,7 @@ static void __init smp_init(void)
 	smp_cpus_done(max_cpus);
 }

-#endif
+#endif /* CONFIG_SMP */

 /*
  * We need to store the untouched command line for future reference.
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://crashcourse.ca
========================================================================
-
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