[PATCH -next V12 0/3] riscv: Add independent irq/softirq stacks

[guoren]

From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

This patch series adds independent irq/softirq stacks to decrease the
press of the thread stack. Also, add a thread STACK_SIZE config for
users to adjust the proper size during compile time.

This patch series belonged to the generic entry, which has been merged
to for-next now.

v12:
 - Rebase on palmer/for-next (20230529)
 - Move DECLARE_PER_CPU(ulong *, irq_stack_ptr) into irq_stack.h (Thx Conor)
 - Optimize commit msg

v11:
https://lore.kernel.org/linux-riscv/20230324071239.151677-1-guoren@xxxxxxxxxx/
 - Rebase on palmer/for-next (20230324)
 - Separate from generic entry patch series.

v10:
https://lore.kernel.org/linux-riscv/20221208025816.138712-1-guoren@xxxxxxxxxx/
 - Rebase on palmer/for-next branch (20221208)
 - Remove unrelated patches from the series (Suggested-by: Bjorn)
 - Fixup Typos.

v9:
https://lore.kernel.org/linux-riscv/20221130034059.826599-1-guoren@xxxxxxxxxx/
 - Fixup NR_syscalls check (by Ben Hutchings)
 - Add Tested-by: Jisheng Zhang

v8:
https://lore.kernel.org/linux-riscv/20221103075047.1634923-1-guoren@xxxxxxxxxx/
 - Rebase on palmer/for-next branch (20221102)
 - Add save/restore_from_x5_to_x31 .macro (JishengZhang)
 - Consolidate ret_from_kernel_thread into ret_from_fork (JishengZhang)
 - Optimize __noinstr_section comment (JiangshanLai)

v7:
https://lore.kernel.org/linux-riscv/20221015114702.3489989-1-guoren@xxxxxxxxxx/
 - Fixup regs_irqs_disabled with SR_PIE
 - Optimize stackleak_erase -> stackleak_erase_on_task_stack (Thx Mark
   Rutland)
 - Add BUG_ON(!irqs_disabled()) in trap handlers
 - Using regs_irqs_disabled in __do_page_fault
 - Remove unnecessary irq disable in ret_from_exception and add comment

v6:
https://lore.kernel.org/linux-riscv/20221002012451.2351127-1-guoren@xxxxxxxxxx/
 - Use THEAD_SIZE_ORDER for thread size adjustment in kconfig (Thx Arnd)
 - Move call_on_stack to inline style (Thx Peter Zijlstra)
 - Fixup fp chain broken (Thx Chen Zhongjin)
 - Remove common entry modification, and fixup page_fault entry (Thx
   Peter Zijlstra)
 - Treat some traps as nmi entry (Thx Peter Zijlstra)

v5:
https://lore.kernel.org/linux-riscv/20220918155246.1203293-1-guoren@xxxxxxxxxx/
 - Add riscv own stackleak patch instead of generic entry modification
   (by Mark Rutland)
 - Add EXPERT dependency for THREAD_SIZE (by Arnd)
 - Add EXPERT dependency for IRQ_STACK (by Sebastian, David Laight)
 - Corrected __trap_section (by Peter Zijlstra)
 - Add Tested-by (Yipeng Zou)
 - Use CONFIG_SOFTIRQ_ON_OWN_STACK replace "#ifndef CONFIG_PREEMPT_RT"
 - Fixup systrace_enter compile error
 - Fixup exit_to_user_mode_prepare preempt_disable warning

V4:
https://lore.kernel.org/linux-riscv/20220908022506.1275799-1-guoren@xxxxxxxxxx/
 - Fixup entry.S with "la" bug (by Conor.Dooley)
 - Fixup missing noinstr bug (by Peter Zijlstra)

V3:
https://lore.kernel.org/linux-riscv/20220906035423.634617-1-guoren@xxxxxxxxxx/
 - Fixup CONFIG_COMPAT=n compile error
 - Add THREAD_SIZE_ORDER config
 - Optimize elf_kexec.c warning fixup
 - Add static to irq_stack_ptr definition

V2:
https://lore.kernel.org/linux-riscv/20220904072637.8619-1-guoren@xxxxxxxxxx/
 - Fixup compile error by include "riscv: ptrace: Remove duplicate
   operation"
 - Fixup compile warning
   Reported-by: kernel test robot <lkp@xxxxxxxxx>
 - Add test repo link in cover letter

V1:
https://lore.kernel.org/linux-riscv/20220903163808.1954131-1-guoren@xxxxxxxxxx/

Guo Ren (3):
  riscv: stack: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
  riscv: stack: Support HAVE_SOFTIRQ_ON_OWN_STACK
  riscv: stack: Add config of thread stack size

 arch/riscv/Kconfig                   | 19 ++++++++
 arch/riscv/include/asm/irq_stack.h   | 32 +++++++++++++
 arch/riscv/include/asm/thread_info.h | 14 ++----
 arch/riscv/kernel/irq.c              | 68 ++++++++++++++++++++++++++++
 arch/riscv/kernel/traps.c            | 35 +++++++++++++-
 5 files changed, 155 insertions(+), 13 deletions(-)
 create mode 100644 arch/riscv/include/asm/irq_stack.h

-- 
2.36.1