The patch titled
genirq: irq: generalize the check for HARDIRQ_BITS
has been added to the -mm tree. Its filename is
genirq-irq-generalize-the-check-for-hardirq_bits.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
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
@@ -27,11 +27,16 @@
#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
add-a-sysfs-file-to-determine-if-a-kexec-kernel-is-loaded.patch
avoid-tasklist_lock-at-getrusage-for-multithreaded-case-too.patch
ptrace-document-the-locking-rules.patch
proc-fix-the-inode-number-on-proc-pid-fd.patch
proc-remove-useless-bkl-in-proc_pid_readlink.patch
proc-remove-unnecessary-and-misleading-assignments.patch
proc-simplify-the-ownership-rules-for-proc.patch
proc-replace-proc_inodetype-with-proc_inodefd.patch
proc-remove-bogus-proc_task_permission.patch
proc-kill-proc_mem_inode_operations.patch
proc-properly-filter-out-files-that-are-not-visible.patch
proc-fix-the-link-count-for-proc-pid-task.patch
proc-move-proc_maps_operations-into-task_mmuc.patch
proc-rewrite-the-proc-dentry-flush-on-exit.patch
proc-close-the-race-of-a-process-dying-durning.patch
proc-refactor-reading-directories-of-tasks.patch
proc-remove-tasklist_lock-from-proc_pid_readdir.patch
proc-remove-tasklist_lock-from-proc_pid_lookup-and.patch
proc-remove-tasklist_lock-from-proc_pid_readdir-simply-fix-first_tgid.patch
proc-make-proc_numbuf-the-buffer-size-for-holding-a.patch
proc-dont-lock-task_structs-indefinitely.patch
proc-dont-lock-task_structs-indefinitely-task_mmu-small-fixes.patch
proc-use-struct-pid-not-struct-task_ref.patch
proc-optimize-proc_check_dentry_visible.patch
proc-use-sane-permission-checks-on-the-proc-pid-fd.patch
proc-cleanup-proc_fd_access_allowed.patch
proc-remove-tasklist_lock-from-proc_task_readdir.patch
simplify-fix-first_tid.patch
cleanup-next_tid.patch
de_thread-fix-lockless-do_each_thread.patch
coredump-optimize-mm-users-traversal.patch
coredump-speedup-sigkill-sending.patch
coredump-kill-ptrace-related-stuff.patch
coredump-kill-ptrace-related-stuff-fix.patch
coredump-dont-take-tasklist_lock.patch
proc-sysctl-add-_proc_do_string-helper.patch
namespaces-add-nsproxy.patch
namespaces-add-nsproxy-dont-include-compileh.patch
namespaces-incorporate-fs-namespace-into-nsproxy.patch
namespaces-utsname-introduce-temporary-helpers.patch
namespaces-utsname-switch-to-using-uts-namespaces.patch
namespaces-utsname-switch-to-using-uts-namespaces-alpha-fix.patch
namespaces-utsname-switch-to-using-uts-namespaces-cleanup.patch
namespaces-utsname-use-init_utsname-when-appropriate.patch
namespaces-utsname-use-init_utsname-when-appropriate-cifs-update.patch
namespaces-utsname-implement-utsname-namespaces.patch
namespaces-utsname-implement-utsname-namespaces-export.patch
namespaces-utsname-implement-utsname-namespaces-dont-include-compileh.patch
namespaces-utsname-sysctl-hack.patch
namespaces-utsname-sysctl-hack-cleanup.patch
namespaces-utsname-sysctl-hack-cleanup-2.patch
namespaces-utsname-sysctl-hack-cleanup-2-fix.patch
namespaces-utsname-remove-system_utsname.patch
namespaces-utsname-implement-clone_newuts-flag.patch
uts-copy-nsproxy-only-when-needed.patch
ipc-namespace-core-fix.patch
ipc-namespace-core-unshare-fix.patch
ipc-namespace-utils-compilation-fix.patch
genirq-irq-convert-the-move_irq-flag-from-a-32bit-word-to-a-single-bit.patch
genirq-irq-add-moved_masked_irq.patch
genirq-x86_64-irq-reenable-migrating-irqs-to-other-cpus.patch
genirq-msi-simplify-msi-enable-and-disable.patch
genirq-msi-simplify-msi-enable-and-disable-fix.patch
genirq-msi-make-the-msi-boolean-tests-return-either-0-or-1.patch
genirq-msi-implement-helper-functions-read_msi_msg-and-write_msi_msg.patch
genirq-msi-refactor-the-msi_ops.patch
genirq-msi-simplify-the-msi-irq-limit-policy.patch
genirq-irq-add-a-dynamic-irq-creation-api.patch
genirq-ia64-irq-dynamic-irq-support.patch
genirq-i386-irq-dynamic-irq-support.patch
genirq-i386-irq-dynamic-irq-support-fix.patch
genirq-x86_64-irq-dynamic-irq-support.patch
genirq-msi-make-the-msi-code-irq-based-and-not-vector-based.patch
genirq-x86_64-irq-move-msi-message-composition-into-io_apicc.patch
genirq-i386-irq-move-msi-message-composition-into-io_apicc.patch
genirq-msi-only-build-msi-apicc-on-ia64.patch
genirq-x86_64-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-i386-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-i386-irq-remove-the-msi-assumption-that-irq-==-vector-fix.patch
genirq-irq-remove-msi-hacks.patch
genirq-irq-generalize-the-check-for-hardirq_bits.patch
genirq-x86_64-irq-make-the-external-irq-handlers-report-their-vector-not-the-irq-number.patch
genirq-x86_64-irq-make-vector_irq-per-cpu.patch
genirq-x86_64-irq-kill-gsi_irq_sharing.patch
genirq-x86_64-irq-kill-irq-compression.patch
genirq-irq-document-what-an-irq-is.patch
pidhash-temporary-debug-checks.patch
genirq-i386-irq-remove-the-msi-assumption-that-irq-==-vector-fix-tidies.patch
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