linux-stable.git/arch/powerpc/include/asm/entry-common.h, branch master

powerpc/entry: Disable interrupts before irqentry_exit

2026-06-08T10:28:03+00:00

Venkat reported a panic on powerpc-next tree where GENERIC_ENTRY has
been enabled.

kernel BUG at kernel/sched/core.c:7512!
NIP  preempt_schedule_irq+0x44/0x118
LR   dynamic_irqentry_exit_cond_resched+0x40/0x1a4
Call Trace:
 dynamic_irqentry_exit_cond_resched+0x40/0x1a4
 do_page_fault+0xc0/0x104
 data_access_common_virt+0x210/0x220

This happens since __do_page_fault ends up enabling the interrupts and
it could take significant time such that need_resched could be set. This
leads to schedule call in irqentry_exit leading to the bug.

There are many such irq handlers which enables the interrupts.
Fix it by disabling the irq before calling irqentry_exit. The same
pattern exists today in interrupt_exit_kernel_prepare.

Fixes: bee25f97ad24 ("powerpc: Enable GENERIC_ENTRY feature")
Reported-by: Venkat Rao Bagalkote 
Closes: https://lore.kernel.org/all/7904105b-9dfa-4efd-a5ef-bc0276ed255d@linux.ibm.com/
Signed-off-by: Shrikanth Hegde 
Tested-by: Venkat Rao Bagalkote 
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260603131054.216235-1-sshegde@linux.ibm.com

powerpc: Prepare for IRQ entry exit

2026-05-20T01:27:14+00:00

Move interrupt entry and exit helper routines from interrupt.h into the
PowerPC-specific entry-common.h header as a preparatory step for enabling
the generic entry/exit framework.

This consolidation places all PowerPC interrupt entry/exit handling in a
single common header, aligning with the generic entry infrastructure.
The helpers provide architecture-specific handling for interrupt and NMI
entry/exit sequences, including:

 - arch_interrupt_enter/exit_prepare()
 - arch_interrupt_async_enter/exit_prepare()
 - arch_interrupt_nmi_enter/exit_prepare()
 - Supporting helpers such as nap_adjust_return(), check_return_regs_valid(),
   debug register maintenance, and soft mask handling.

The functions are copied verbatim from interrupt.h.Subsequent patches will
integrate these routines into the generic entry/exit flow.

No functional change intended.

Signed-off-by: Mukesh Kumar Chaurasiya 
Tested-by: Samir M 
Tested-by: David Gow 
Tested-by: Venkat Rao Bagalkote 
Reviewed-by: Shrikanth Hegde 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260427122742.210074-7-mkchauras@gmail.com

powerpc: Introduce syscall exit arch functions

2026-05-20T01:27:14+00:00

Add PowerPC-specific implementations of the generic syscall exit hooks
used by the generic entry/exit framework:

 - arch_exit_to_user_mode_work_prepare()
 - arch_exit_to_user_mode_work()

These helpers handle user state restoration when returning from the
kernel to userspace, including FPU/VMX/VSX state, transactional memory,
KUAP restore, and per-CPU accounting.

Additionally, move check_return_regs_valid() from interrupt.c to
interrupt.h so it can be shared by the new entry/exit logic.

No functional change is intended with this patch.

Signed-off-by: Mukesh Kumar Chaurasiya 
Tested-by: Samir M 
Tested-by: David Gow 
Tested-by: Venkat Rao Bagalkote 
Reviewed-by: Shrikanth Hegde 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260427122742.210074-5-mkchauras@gmail.com

powerpc: introduce arch_enter_from_user_mode

2026-05-20T01:27:13+00:00

Implement the arch_enter_from_user_mode() hook required by the generic
entry/exit framework. This helper prepares the CPU state when entering
the kernel from userspace, ensuring correct handling of KUAP/KUEP,
transactional memory, and debug register state.

This patch contains no functional changes, it is purely preparatory for
enabling the generic syscall and interrupt entry path on PowerPC.

Signed-off-by: Mukesh Kumar Chaurasiya 
Tested-by: Samir M 
Tested-by: David Gow 
Tested-by: Venkat Rao Bagalkote 
Reviewed-by: Shrikanth Hegde 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260427122742.210074-4-mkchauras@gmail.com

powerpc: Prepare to build with generic entry/exit framework

2026-05-20T01:27:13+00:00

This patch introduces preparatory changes needed to support building
PowerPC with the generic entry/exit (irqentry) framework.

The following infrastructure updates are added:
 - Add a syscall_work field to struct thread_info to hold SYSCALL_WORK_* flags.
 - Provide a stub implementation of arch_syscall_is_vdso_sigreturn(),
   returning false for now.
 - Introduce on_thread_stack() helper to detect if the current stack pointer
   lies within the task’s kernel stack.

These additions enable later integration with the generic entry/exit
infrastructure while keeping existing PowerPC behavior unchanged.

No functional change is intended in this patch.

Signed-off-by: Mukesh Kumar Chaurasiya 
Tested-by: Samir M 
Tested-by: David Gow 
Tested-by: Venkat Rao Bagalkote 
Reviewed-by: Shrikanth Hegde 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260427122742.210074-3-mkchauras@gmail.com