Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6cc4525d29e22ab831387b6fac371e0118693a25
Commit: 6cc4525d29e22ab831387b6fac371e0118693a25
Parent: 873d50e2e56741406ff9d68c275f0c560e896a80
Author: Kyle McMartin <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 18 00:04:56 2007 -0700
Committer: Kyle McMartin <[EMAIL PROTECTED]>
CommitDate: Thu Oct 18 00:59:31 2007 -0700
[PARISC] Kill off broken irqstack code
It's been unfinished and broken long enough, and I have some ideas on how
to do it more cleanly.
Signed-off-by: Kyle McMartin <[EMAIL PROTECTED]>
---
arch/parisc/kernel/entry.S | 37 +++----------------------------------
arch/parisc/kernel/head.S | 4 ----
arch/parisc/kernel/init_task.c | 1 -
arch/parisc/kernel/smp.c | 12 ------------
arch/parisc/kernel/vmlinux.lds.S | 8 --------
include/asm-parisc/pgtable.h | 8 --------
6 files changed, 3 insertions(+), 67 deletions(-)
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index f324939..111d472 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -98,7 +98,6 @@
* The "get_stack" macros are responsible for determining the
* kernel stack value.
*
- * For Faults:
* If sr7 == 0
* Already using a kernel stack, so call the
* get_stack_use_r30 macro to push a pt_regs structure
@@ -110,26 +109,6 @@
* task pointer pointed to by cr30. Set the stack
* pointer to point to the end of the task structure.
*
- * For Interrupts:
- * If sr7 == 0
- * Already using a kernel stack, check to see if r30
- * is already pointing to the per processor interrupt
- * stack. If it is, call the get_stack_use_r30 macro
- * to push a pt_regs structure on the stack, and store
- * registers there. Otherwise, call get_stack_use_cr31
- * to get a pointer to the base of the interrupt stack
- * and push a pt_regs structure on that stack.
- * else
- * Need to set up a kernel stack, so call the
- * get_stack_use_cr30 macro to set up a pointer
- * to the pt_regs structure contained within the
- * task pointer pointed to by cr30. Set the stack
- * pointer to point to the end of the task structure.
- * N.B: We don't use the interrupt stack for the
- * first interrupt from userland, because signals/
- * resched's are processed when returning to userland,
- * and we can sleep in those cases.
- *
* Note that we use shadowed registers for temps until
* we can save %r26 and %r29. %r26 is used to preserve
* %r8 (a shadowed register) which temporarily contained
@@ -1086,23 +1065,13 @@ intr_do_preempt:
intr_extint:
CMPIB=,n 0,%r16,1f
+
get_stack_use_cr30
- b,n 3f
+ b,n 2f
1:
-#if 0 /* Interrupt Stack support not working yet! */
- mfctl %cr31,%r1
- copy %r30,%r17
- /* FIXME! depi below has hardcoded idea of interrupt stack size (32k)*/
- DEPI 0,31,15,%r17
- CMPB=,n %r1,%r17,2f
- get_stack_use_cr31
- b,n 3f
-#endif
-2:
get_stack_use_r30
-
-3:
+2:
save_specials %r29
virt_map
save_general %r29
diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S
index 369919d..a7b8859 100644
--- a/arch/parisc/kernel/head.S
+++ b/arch/parisc/kernel/head.S
@@ -128,10 +128,6 @@ $pgt_fill_loop:
/* And the stack pointer too */
ldo THREAD_SZ_ALGN(%r6),%sp
- /* And the interrupt stack */
- load32 interrupt_stack,%r6
- mtctl %r6,%cr31
-
#ifdef CONFIG_SMP
/* Set the smp rendevous address into page zero.
** It would be safer to do this in init_smp_config() but
diff --git a/arch/parisc/kernel/init_task.c b/arch/parisc/kernel/init_task.c
index 3b2f7d3..26198a0 100644
--- a/arch/parisc/kernel/init_task.c
+++ b/arch/parisc/kernel/init_task.c
@@ -49,7 +49,6 @@ EXPORT_SYMBOL(init_mm);
* way process stacks are handled. This is done by having a special
* "init_task" linker map entry..
*/
-unsigned char interrupt_stack[ISTACK_SIZE] __attribute__
((section("init_istack"), aligned(PAGE_SIZE)));
union thread_union init_thread_union
__attribute__((aligned(128)))
__attribute__((__section__(".data.init_task"))) =
{ INIT_THREAD_INFO(init_task) };
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index d7bc7bb..85fc775 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -432,22 +432,10 @@ smp_cpu_init(int cpunum)
void __init smp_callin(void)
{
int slave_id = cpu_now_booting;
-#if 0
- void *istack;
-#endif
smp_cpu_init(slave_id);
preempt_disable();
-#if 0 /* NOT WORKING YET - see entry.S */
- istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER);
- if (istack == NULL) {
- printk(KERN_CRIT "Failed to allocate interrupt stack for cpu
%d\n",slave_id);
- BUG();
- }
- mtctl(istack,31);
-#endif
-
flush_cache_all_local(); /* start with known state */
flush_tlb_all_local(NULL);
diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
index d6dbcbc..40d0ff9 100644
--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -153,14 +153,6 @@ SECTIONS
*(.data.init_task)
}
- /* The interrupt stack is currently partially coded, but not yet
- * implemented
- */
- . = ALIGN(16384);
- init_istack : {
- *(init_istack)
- }
-
#ifdef CONFIG_64BIT
. = ALIGN(16);
/* Linkage tables */
diff --git a/include/asm-parisc/pgtable.h b/include/asm-parisc/pgtable.h
index 33ed0e7..b5a8797 100644
--- a/include/asm-parisc/pgtable.h
+++ b/include/asm-parisc/pgtable.h
@@ -49,14 +49,6 @@
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned
long)pgd_val(e))
- /* Note: If you change ISTACK_SIZE, you need to change the corresponding
- * values in vmlinux.lds and vmlinux64.lds (init_istack section). Also,
- * the "order" and size need to agree.
- */
-
-#define ISTACK_SIZE 32768 /* Interrupt Stack Size */
-#define ISTACK_ORDER 3
-
/* This is the size of the initially mapped kernel memory */
#ifdef CONFIG_64BIT
#define KERNEL_INITIAL_ORDER 24 /* 0 to 1<<24 = 16MB */
-
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