[PATCH v2] MIPS: get rid of 'kgdb_early_setup' cruft

[PATCH v2] MIPS: get rid of 'kgdb_early_setup' cruft

[Sergei Shtylyov]

Commit 854700115ecf ([MIPS] kgdb: add arch support for the kernel's kgdb core)
added the 'kgdb_early_setup' flag to avoid  calling trap_init() and init_IRQ()
the second time, however the code that called these functions earlier,  from
kgdb_arch_init(), had been already removed by that  time,  so the flag never
served any useful purpose. Remove the related code along with ugly #ifdef'ery
at last.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
The patch is against the recent Linus' repo.  Tell me if you want it to be
rebased against some MIPS repo...

Changes in version 2:
- fixed typo in the summary.

 arch/mips/include/asm/kgdb.h |    1 -
 arch/mips/kernel/irq.c       |   15 ---------------
 arch/mips/kernel/kgdb.c      |    4 ----
 arch/mips/kernel/traps.c     |    6 ------
 4 files changed, 26 deletions(-)

Index: linux/arch/mips/include/asm/kgdb.h
===================================================================
--- linux.orig/arch/mips/include/asm/kgdb.h
+++ linux/arch/mips/include/asm/kgdb.h
@@ -33,7 +33,6 @@
 #define CACHE_FLUSH_IS_SAFE	0
 
 extern void arch_kgdb_breakpoint(void);
-extern int kgdb_early_setup;
 extern void *saved_vectors[32];
 extern void handle_exception(struct pt_regs *regs);
 extern void breakinst(void);
Index: linux/arch/mips/kernel/irq.c
===================================================================
--- linux.orig/arch/mips/kernel/irq.c
+++ linux/arch/mips/kernel/irq.c
@@ -19,16 +19,11 @@
 #include <linux/sched.h>
 #include <linux/seq_file.h>
 #include <linux/kallsyms.h>
-#include <linux/kgdb.h>
 #include <linux/ftrace.h>
 
 #include <linux/atomic.h>
 #include <asm/uaccess.h>
 
-#ifdef CONFIG_KGDB
-int kgdb_early_setup;
-#endif
-
 static DECLARE_BITMAP(irq_map, NR_IRQS);
 
 int allocate_irqno(void)
@@ -93,20 +88,10 @@ void __init init_IRQ(void)
 {
 	int i;
 
-#ifdef CONFIG_KGDB
-	if (kgdb_early_setup)
-		return;
-#endif
-
 	for (i = 0; i < NR_IRQS; i++)
 		irq_set_noprobe(i);
 
 	arch_init_irq();
-
-#ifdef CONFIG_KGDB
-	if (!kgdb_early_setup)
-		kgdb_early_setup = 1;
-#endif
 }
 
 #ifdef DEBUG_STACKOVERFLOW
Index: linux/arch/mips/kernel/kgdb.c
===================================================================
--- linux.orig/arch/mips/kernel/kgdb.c
+++ linux/arch/mips/kernel/kgdb.c
@@ -378,10 +378,6 @@ int kgdb_arch_handle_exception(int vecto
 
 struct kgdb_arch arch_kgdb_ops;
 
-/*
- * We use kgdb_early_setup so that functions we need to call now don't
- * cause trouble when called again later.
- */
 int kgdb_arch_init(void)
 {
 	union mips_instruction insn = {
Index: linux/arch/mips/kernel/traps.c
===================================================================
--- linux.orig/arch/mips/kernel/traps.c
+++ linux/arch/mips/kernel/traps.c
@@ -29,7 +29,6 @@
 #include <linux/bootmem.h>
 #include <linux/interrupt.h>
 #include <linux/ptrace.h>
-#include <linux/kgdb.h>
 #include <linux/kdebug.h>
 #include <linux/kprobes.h>
 #include <linux/notifier.h>
@@ -2184,11 +2183,6 @@ void __init trap_init(void)
 
 	check_wait();
 
-#if defined(CONFIG_KGDB)
-	if (kgdb_early_setup)
-		return; /* Already done */
-#endif
-
 	if (cpu_has_veic || cpu_has_vint) {
 		unsigned long size = 0x200 + VECTORSPACING*64;
 		ebase = (unsigned long)

Re: [PATCH v2] MIPS: get rid of 'kgdb_early_setup' cruft

[Ralf Baechle]

On Mon, Jun 01, 2015 at 12:40:32AM +0300, Sergei Shtylyov wrote:

> Commit 854700115ecf ([MIPS] kgdb: add arch support for the kernel's kgdb core)
> added the 'kgdb_early_setup' flag to avoid  calling trap_init() and init_IRQ()
> the second time, however the code that called these functions earlier,  from
> kgdb_arch_init(), had been already removed by that  time,  so the flag never
> served any useful purpose. Remove the related code along with ugly #ifdef'ery
> at last.
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
> 
> ---
> The patch is against the recent Linus' repo.  Tell me if you want it to be
> rebased against some MIPS repo...

There's been a minor conflict which was trivial to reslve.

Thanks,

  Ralf