The patch titled
x86: increase interrupt vector range
has been removed from the -mm tree. Its filename is
x86-increase-interrupt-vector-range.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: x86: increase interrupt vector range
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Remove the limit of 256 interrupt vectors by changing the value stored in
orig_{e,r}ax to be the complemented interrupt vector. The orig_{e,r}ax
needs to be < 0 to allow the signal code to distinguish between return from
interrupt and return from syscall. With this change applied, NR_IRQS can
be > 256.
Xen extends the IRQ numbering space to include room for dynamically
allocated virtual interrupts (in the range 256-511), which requires a more
permissive interface to do_IRQ.
Signed-off-by: Ian Pratt <ian.pratt@xxxxxxxxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: "Protasevich, Natalie" <Natalie.Protasevich@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/entry.S | 4 ++--
arch/i386/kernel/irq.c | 4 ++--
arch/x86_64/kernel/entry.S | 2 +-
arch/x86_64/kernel/irq.c | 4 ++--
arch/x86_64/kernel/smp.c | 4 ++--
include/asm-x86_64/hw_irq.h | 2 +-
6 files changed, 10 insertions(+), 10 deletions(-)
diff -puN arch/i386/kernel/entry.S~x86-increase-interrupt-vector-range arch/i386/kernel/entry.S
--- a/arch/i386/kernel/entry.S~x86-increase-interrupt-vector-range
+++ a/arch/i386/kernel/entry.S
@@ -515,7 +515,7 @@ ENTRY(irq_entries_start)
.if vector
CFI_ADJUST_CFA_OFFSET -4
.endif
-1: pushl $vector-256
+1: pushl $~(vector)
CFI_ADJUST_CFA_OFFSET 4
jmp common_interrupt
.data
@@ -535,7 +535,7 @@ common_interrupt:
#define BUILD_INTERRUPT(name, nr) \
ENTRY(name) \
RING0_INT_FRAME; \
- pushl $nr-256; \
+ pushl $~(nr); \
CFI_ADJUST_CFA_OFFSET 4; \
SAVE_ALL; \
movl %esp,%eax; \
diff -puN arch/i386/kernel/irq.c~x86-increase-interrupt-vector-range arch/i386/kernel/irq.c
--- a/arch/i386/kernel/irq.c~x86-increase-interrupt-vector-range
+++ a/arch/i386/kernel/irq.c
@@ -53,8 +53,8 @@ static union irq_ctx *softirq_ctx[NR_CPU
*/
fastcall unsigned int do_IRQ(struct pt_regs *regs)
{
- /* high bits used in ret_from_ code */
- int irq = regs->orig_eax & 0xff;
+ /* high bit used in ret_from_ code */
+ int irq = ~regs->orig_eax;
#ifdef CONFIG_4KSTACKS
union irq_ctx *curctx, *irqctx;
u32 *isp;
diff -puN arch/x86_64/kernel/entry.S~x86-increase-interrupt-vector-range arch/x86_64/kernel/entry.S
--- a/arch/x86_64/kernel/entry.S~x86-increase-interrupt-vector-range
+++ a/arch/x86_64/kernel/entry.S
@@ -588,7 +588,7 @@ END(common_interrupt)
*/
.macro apicinterrupt num,func
INTR_FRAME
- pushq $\num-256
+ pushq $~(\num)
CFI_ADJUST_CFA_OFFSET 8
interrupt \func
jmp ret_from_intr
diff -puN arch/x86_64/kernel/irq.c~x86-increase-interrupt-vector-range arch/x86_64/kernel/irq.c
--- a/arch/x86_64/kernel/irq.c~x86-increase-interrupt-vector-range
+++ a/arch/x86_64/kernel/irq.c
@@ -115,8 +115,8 @@ skip:
*/
asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
{
- /* high bits used in ret_from_ code */
- unsigned irq = regs->orig_rax & 0xff;
+ /* high bit used in ret_from_ code */
+ unsigned irq = ~regs->orig_rax;
exit_idle();
irq_enter();
diff -puN arch/x86_64/kernel/smp.c~x86-increase-interrupt-vector-range arch/x86_64/kernel/smp.c
--- a/arch/x86_64/kernel/smp.c~x86-increase-interrupt-vector-range
+++ a/arch/x86_64/kernel/smp.c
@@ -135,10 +135,10 @@ asmlinkage void smp_invalidate_interrupt
cpu = smp_processor_id();
/*
- * orig_rax contains the interrupt vector - 256.
+ * orig_rax contains the negated interrupt vector.
* Use that to determine where the sender put the data.
*/
- sender = regs->orig_rax + 256 - INVALIDATE_TLB_VECTOR_START;
+ sender = ~regs->orig_rax - INVALIDATE_TLB_VECTOR_START;
f = &per_cpu(flush_state, sender);
if (!cpu_isset(cpu, f->flush_cpumask))
diff -puN include/asm-x86_64/hw_irq.h~x86-increase-interrupt-vector-range include/asm-x86_64/hw_irq.h
--- a/include/asm-x86_64/hw_irq.h~x86-increase-interrupt-vector-range
+++ a/include/asm-x86_64/hw_irq.h
@@ -124,7 +124,7 @@ asmlinkage void IRQ_NAME(nr); \
__asm__( \
"\n.p2align\n" \
"IRQ" #nr "_interrupt:\n\t" \
- "push $" #nr "-256 ; " \
+ "push $~(" #nr ") ; " \
"jmp common_interrupt");
#if defined(CONFIG_X86_IO_APIC)
_
Patches currently in -mm which might be from rusty@xxxxxxxxxxxxxxx are
origin.patch
x86-do_irq-check-irq-number.patch
lockdep-add-is_module_address.patch
lockdep-add-per_cpu_offset.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
