The patch titled
genirq: irq: generalize the check for HARDIRQ_BITS
has been removed from the -mm tree. Its filename is
genirq-irq-generalize-the-check-for-hardirq_bits.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: genirq: irq: generalize the check for HARDIRQ_BITS
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
This patch adds support for systems that cannot receive every interrupt on a
single cpu simultaneously, in the check to see if we have enough HARDIRQ_BITS.
MAX_HARDIRQS_PER_CPU becomes the count of the maximum number of hardare
generated interrupts per cpu.
On architectures that support per cpu interrupt delivery this can be a
significant space savings and scalability bonus.
This patch adds support for systems that cannot receive every interrupt on
Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Rajesh Shah <rajesh.shah@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Cc: "Protasevich, Natalie" <Natalie.Protasevich@xxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/asm-x86_64/hardirq.h | 3 +++
include/linux/hardirq.h | 7 ++++++-
2 files changed, 9 insertions(+), 1 deletion(-)
diff -puN include/asm-x86_64/hardirq.h~genirq-irq-generalize-the-check-for-hardirq_bits include/asm-x86_64/hardirq.h
--- a/include/asm-x86_64/hardirq.h~genirq-irq-generalize-the-check-for-hardirq_bits
+++ a/include/asm-x86_64/hardirq.h
@@ -6,6 +6,9 @@
#include <asm/pda.h>
#include <asm/apic.h>
+/* We can have at most NR_VECTORS irqs routed to a cpu at a time */
+#define MAX_HARDIRQS_PER_CPU NR_VECTORS
+
#define __ARCH_IRQ_STAT 1
#define local_softirq_pending() read_pda(__softirq_pending)
diff -puN include/linux/hardirq.h~genirq-irq-generalize-the-check-for-hardirq_bits include/linux/hardirq.h
--- a/include/linux/hardirq.h~genirq-irq-generalize-the-check-for-hardirq_bits
+++ a/include/linux/hardirq.h
@@ -28,11 +28,16 @@
#ifndef HARDIRQ_BITS
#define HARDIRQ_BITS 12
+
+#ifndef MAX_HARDIRQS_PER_CPU
+#define MAX_HARDIRQS_PER_CPU NR_IRQS
+#endif
+
/*
* The hardirq mask has to be large enough to have space for potentially
* all IRQ sources in the system nesting on a single CPU.
*/
-#if (1 << HARDIRQ_BITS) < NR_IRQS
+#if (1 << HARDIRQ_BITS) < MAX_HARDIRQS_PER_CPU
# error HARDIRQ_BITS is too low!
#endif
#endif
_
Patches currently in -mm which might be from ebiederm@xxxxxxxxxxxx are
origin.patch
git-scsi-misc.patch
insert-local-and-io-apics-into-resource-map.patch
i386-distinguish-absolute-symbols.patch
i386-define-__pa_symbol.patch
i386-setupc-reserve-kernel-memory-starting-from-_text.patch
i386-config_physical_start-cleanup.patch
make-linux-elfh-safe-to-be-included-in-assembly-files.patch
elf-add-elfosabi_standalone-to-elfh.patch
kallsyms-generate-relocatable-symbols.patch
i386-relocatable-kernel-support.patch
genirq-clean-up-irq-flow-type-naming.patch
pidhash-temporary-debug-checks.patch
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