[PATCH 09/41] powerpc: Update obsolete comments in setup_32.c about entry conditions

Benjamin Herrenschmidt benh at kernel.crashing.org
Tue Jul 5 15:03:45 AEST 2016

early_init() is called in-place before kernel relocation and using
whatever MMU setup exists at the point the kernel is entered.

machine_init() is called after relocation and after some initial
mapping of PAGE_OFFSET has been established (typically using BATs
on 6xx/7xx/7xxx processors or some form of bolted TLB on others).

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
 arch/powerpc/kernel/setup_32.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 34e61d68..3f0aca2 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -61,9 +61,7 @@ int icache_bsize;
 int ucache_bsize;
- * We're called here very early in the boot.  We determine the machine
- * type and call the appropriate low-level setup functions.
- *  -- Cort <cort at fsmlabs.com>
+ * We're called here very early in the boot.
  * Note that the kernel may be running at an address which is different
  * from the address that it was linked at, so we must use RELOC/PTRRELOC
@@ -91,6 +89,10 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
+ * This is run before start_kernel(), the kernel has been relocated
+ * and we are running with enough of the MMU enabled to have our
+ * proper kernel virtual addresses
+ *
  * Find out what kind of machine we're on and save any data we need
  * from the early boot process (devtree is copied on pmac by prom_init()).
  * This is called very early on the boot process, after a minimal

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