linux.git/kernel/irq/generic-chip.c, branch v7.1

Convert 'alloc_flex' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This is the exact same thing as the 'alloc_obj()' version, only much
smaller because there are a lot fewer users of the *alloc_flex()
interface.

As with alloc_obj() version, this was done entirely with mindless brute
force, using the same script, except using 'flex' in the pattern rather
than 'objs*'.

Signed-off-by: Linus Torvalds

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from
scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to
avoid scalar types (which need careful case-by-case checking), and
instead replace kmalloc-family calls that allocate struct or union
object instances:

Single allocations:	kmalloc(sizeof(TYPE), ...)
are replaced with:	kmalloc_obj(TYPE, ...)

Array allocations:	kmalloc_array(COUNT, sizeof(TYPE), ...)
are replaced with:	kmalloc_objs(TYPE, COUNT, ...)

Flex array allocations:	kmalloc(struct_size(PTR, FAM, COUNT), ...)
are replaced with:	kmalloc_flex(*PTR, FAM, COUNT, ...)

(where TYPE may also be *VAR)

The resulting allocations no longer return "void *", instead returning
"TYPE *".

Signed-off-by: Kees Cook

syscore: Pass context data to callbacks

2025-11-14T09:01:52+00:00

Several drivers can benefit from registering per-instance data along
with the syscore operations. To achieve this, move the modifiable fields
out of the syscore_ops structure and into a separate struct syscore that
can be registered with the framework. Add a void * driver data field for
drivers to store contextual data that will be passed to the syscore ops.

Acked-by: Rafael J. Wysocki (Intel) 
Signed-off-by: Thierry Reding

genirq/generic-chip: Fix incorrect lock guard conversions

2025-04-08T20:49:02+00:00

When booting BeagleBone Black:

    ------------[ cut here ]------------
    WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:4398 lockdep_hardirqs_on_prepare+0x23c/0x280
    DEBUG_LOCKS_WARN_ON(early_boot_irqs_disabled)
    CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0-rc1-boneblack-00004-g195298c3b116 #209 NONE
    Hardware name: Generic AM33XX (Flattened Device Tree)
    Call trace:
     _raw_spin_unlock_irq from irq_map_generic_chip+0x144/0x190
     irq_map_generic_chip from irq_domain_associate_locked+0x68/0x164
     irq_domain_associate_locked from irq_create_fwspec_mapping+0x34c/0x43c
     irq_create_fwspec_mapping from irq_create_of_mapping+0x64/0x8c
     irq_create_of_mapping from irq_of_parse_and_map+0x54/0x7c
     irq_of_parse_and_map from dmtimer_clkevt_init_common+0x54/0x15c
     dmtimer_clkevt_init_common from dmtimer_systimer_init+0x41c/0x5b8
     dmtimer_systimer_init from timer_probe+0x68/0xf0
     timer_probe from start_kernel+0x4a4/0x6bc
     start_kernel from 0x0
    irq event stamp: 0
    hardirqs last  enabled at (0): [<00000000>] 0x0
    hardirqs last disabled at (0): [<00000000>] 0x0
    softirqs last  enabled at (0): [<00000000>] 0x0
    softirqs last disabled at (0): [<00000000>] 0x0
    ---[ end trace 0000000000000000 ]---

and:

    ------------[ cut here ]------------
    WARNING: CPU: 0 PID: 0 at init/main.c:1022 start_kernel+0x4e8/0x6bc
    Interrupts were enabled early
    CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G        W           6.15.0-rc1-boneblack-00004-g195298c3b116 #209 NONE
    Tainted: [W]=WARN
    Hardware name: Generic AM33XX (Flattened Device Tree)
    Call trace:
     unwind_backtrace from show_stack+0x10/0x14
     show_stack from dump_stack_lvl+0x6c/0x90
     dump_stack_lvl from __warn+0x70/0x1b0
     __warn from warn_slowpath_fmt+0x1d4/0x1ec
     warn_slowpath_fmt from start_kernel+0x4e8/0x6bc
     start_kernel from 0x0
    irq event stamp: 0
    hardirqs last  enabled at (0): [<00000000>] 0x0
    hardirqs last disabled at (0): [<00000000>] 0x0
    softirqs last  enabled at (0): [<00000000>] 0x0
    softirqs last disabled at (0): [<00000000>] 0x0
    ---[ end trace 0000000000000000 ]---

Fix this by correcting two misconversions of
raw_spin_{,un}lock_irq{save,restore}() to lock guards.

Fixes: 195298c3b11628a6 ("genirq/generic-chip: Convert core code to lock guards")
Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/514f94c5891c61ac0a4a7fdad113e75db1eea367.1744135467.git.geert+renesas@glider.be

genirq/generic-chip: Convert core code to lock guards

2025-04-07T07:43:19+00:00

Replace the irq_gc_lock/unlock() pairs with guards. There is no point to
implement a guard wrapper for them as they just wrap around raw_spin_lock*().

Switch the other lock instances in the core code to guards as well.

Conversion was done with Coccinelle plus manual fixups.

No functional change.

Signed-off-by: Thomas Gleixner 
Reviewed-by: Linus Walleij 
Link: https://lore.kernel.org/all/20250313142524.073826193@linutronix.de

genirq/generic_chip: Export irq_gc_mask_disable_and_ack_set()

2025-01-16T08:10:17+00:00

The recent conversion of brcmstb_l2_mask_and_ack() to
irq_gc_mask_disable_and_ack_set() missed that the driver can be built as a
module, but the generic function is not exported.

Add the missing export.

[ tglx: Converted it to a fix ]

Fixes: dd1f17a9faf5 ("irqchip/irq-brcmstb-l2: Replace brcmstb_l2_mask_and_ack() by generic function")
Signed-off-by: Dr. David Alan Gilbert 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20250116005920.626822-1-linux@treblig.org

genirq/generic_chip: Introduce init() and exit() hooks

2024-06-17T13:48:14+00:00

Most of generic chip drivers need to perform some more additional
initializations on the generic chips allocated before they can be fully
ready.

These additional initializations need to be performed before the IRQ
domain is published to avoid a race condition between IRQ consumers and
suppliers.

Introduce the init() hook to perform these initializations at the right
place just after the generic chip creation. Also introduce the exit() hook
to allow reverting operations done by the init() hook just before the
generic chip is destroyed.

Suggested-by: Thomas Gleixner 
Signed-off-by: Herve Codina 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/20240614173232.1184015-15-herve.codina@bootlin.com

genirq/generic_chip: Introduce irq_domain_{alloc,remove}_generic_chips()

2024-06-17T13:48:14+00:00

The existing __irq_alloc_domain_generic_chips() uses a bunch of parameters
to describe the generic chips that need to be allocated.

Adding more parameters and wrappers to hide new parameters in the existing
code leads to more and more code without any relevant values and without
any flexibility.

Introduce irq_domain_alloc_generic_chips() where the generic chips
description is done using the irq_domain_chip_generic_info structure
instead of the bunch of parameters to allow flexibility and easy evolution.

Also introduce irq_domain_remove_generic_chips() to revert the operations
done by irq_domain_alloc_generic_chips().

Suggested-by: Thomas Gleixner 
Signed-off-by: Herve Codina 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/20240614173232.1184015-14-herve.codina@bootlin.com

genirq/generic_chip: Make irq_remove_generic_chip() irqdomain aware

2023-10-27T07:15:44+00:00

irq_remove_generic_chip() calculates the Linux interrupt number for removing the
handler and interrupt chip based on gc::irq_base as a linear function of
the bit positions of set bits in the @msk argument.

When the generic chip is present in an irq domain, i.e. created with a call
to irq_alloc_domain_generic_chips(), gc::irq_base contains not the base
Linux interrupt number.  It contains the base hardware interrupt for this
chip. It is set to 0 for the first chip in the domain, 0 + N for the next
chip, where $N is the number of hardware interrupts per chip.

That means the Linux interrupt number cannot be calculated based on
gc::irq_base for irqdomain based chips without a domain map lookup, which
is currently missing.

Rework the code to take the irqdomain case into account and calculate the
Linux interrupt number by a irqdomain lookup of the domain specific
hardware interrupt number.

[ tglx: Massage changelog. Reshuffle the logic and add a proper comment. ]

Fixes: cfefd21e693d ("genirq: Add chip suspend and resume callbacks")
Signed-off-by: Herve Codina 
Signed-off-by: Thomas Gleixner 
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20231024150335.322282-1-herve.codina@bootlin.com

genirq/generic-chip: Fix the irq_chip name for /proc/interrupts

2023-10-13T10:25:31+00:00

irq_init_generic_chip() only sets the name for the first chip type, which
leads to empty names for other chip types.  Eventually, these names will be
shown as "-" /proc/interrupts.

Set the name for all chip types by default.

Signed-off-by: Keguang Zhang 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/20230925121734.93017-1-keguang.zhang@gmail.com