This is v2 of "alpha: catch up on architecture Kconfig options"
(https://lore.kernel.org/linux-alpha/caedq38foupzftf9vdcjk8l38j+cdztyxdl+fj-3oaqhmmox...@mail.gmail.com/T/#t),
addressing Magnus Lindholm's review and rebased onto v7.3-rc1 plus his
GENERIC_ENTRY v5
(https://lore.kernel.org/linux-alpha/[email protected]/T/#t),
per his request.
Changes since v1:
- Dropped "fix arch_irqs_disabled_flags() to treat any raised IPL as
disabled". Magnus's objection was right: per the Architecture
Reference Manual an intermediate IPL only masks interrupts at or
below that level, and do_entInt() already drives PS.IPL to IPL_MAX
itself before reporting hardirq state to lockdep, so the original
arch_irqs_disabled_flags() was correct as it stood.
- Dropped "add TRACE_IRQFLAGS_SUPPORT". It conflicted with
GENERIC_ENTRY exactly where Magnus expected: the entInt, entSys, and
restore_all instrumentation it added is now redundant with the
hardirq-state transitions GENERIC_ENTRY performs on those paths
itself. I want to work out separately, and with real testing,
whether the remaining synchronous-exception entry points need
anything at all here, rather than resend a patch I can't fully
justify.
- Fixed "add ARCH_SUPPORTS_PAGE_TABLE_CHECK support", which no longer
built against v7.3-rc1: commit cf8771ca4cdb ("mm/page_table_check:
Pass mm_struct to pxx_user_accessible_page()") changed the callback
signature, and Alpha's copy is now updated to match.
- Added the Signed-off-by that was missing from "select SPARSE_IRQ".
- Folded the corresponding arch-support.txt updates into "select
ARCH_HAS_GCOV_PROFILE_ALL", "select HAVE_DEBUG_KMEMLEAK", "add
ARCH_HAS_PTE_SPECIAL support", and "select ARCH_HAS_DEBUG_VM_PGTABLE",
and added ALPHA to the memtest= parameter list in
kernel-parameters.txt.
- Did not touch "add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP
support" beyond rebasing it. Magnus found real gaps there
(tools/perf has no Alpha register mask, and regs->usp isn't
snapshotted on the interrupt path), so I've left the corresponding
feature matrices alone rather than claim it's done.
- Picked up Tested-by/Reviewed-by from Magnus on the patches he gave
them for.
Not yet addressed: whether do_entInt() should own hardirq context for
both interrupt paths and drop the irq_enter()/irq_exit() pair from
handle_irq(), which Magnus asked about on "enter hardirq context before
looking up the irq descriptor". No code change there yet; I'll follow up
on that thread separately.
Tested by cross-building with alpha-unknown-linux-gnu-gcc against
defconfig and, for the page-table-check fix, against a config with
CONFIG_PAGE_TABLE_CHECK=y. Boot tested on an AlphaServer ES47.
Also available at:
git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha.git
arch-kconfig-options-v2
Signed-off-by: Matt Turner <[email protected]>
---
Matt Turner (22):
alpha: enter hardirq context before looking up the irq descriptor
alpha: select ARCH_HAS_UBSAN
alpha: select ARCH_HAS_GCOV_PROFILE_ALL
alpha: select HAVE_DEBUG_KMEMLEAK
alpha: select EDAC_SUPPORT
alpha: select ARCH_SUPPORTS_ATOMIC_RMW
alpha: select ARCH_HAS_FAST_MULTIPLIER
alpha: select ARCH_SUPPORTS_INT128
alpha: select HAVE_ARCH_COMPILER_H
alpha: select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
alpha: add HAVE_ARCH_THREAD_STRUCT_WHITELIST support
alpha: add ARCH_HAS_PTE_SPECIAL support
alpha: add ARCH_SUPPORTS_PAGE_TABLE_CHECK support
alpha: select ARCH_HAS_DEBUG_VM_PGTABLE
alpha: select HAVE_GUP_FAST
alpha: select ARCH_USE_MEMTEST
alpha: select SYSCTL_EXCEPTION_TRACE
alpha: discard .eh_frame and the relocation sections
alpha: select ARCH_WANT_LD_ORPHAN_WARN
alpha: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
alpha: add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP support
alpha: select SPARSE_IRQ
Documentation/admin-guide/kernel-parameters.txt | 2 +-
.../debug/debug-vm-pgtable/arch-support.txt | 2 +-
.../debug/gcov-profile-all/arch-support.txt | 2 +-
.../features/debug/kmemleak/arch-support.txt | 2 +-
.../features/vm/pte_special/arch-support.txt | 2 +-
arch/alpha/Kconfig | 21 ++++++
arch/alpha/include/asm/perf_regs.h | 7 ++
arch/alpha/include/asm/pgtable.h | 24 +++++-
arch/alpha/include/asm/processor.h | 7 ++
arch/alpha/include/uapi/asm/perf_regs.h | 34 +++++++++
arch/alpha/kernel/Makefile | 1 +
arch/alpha/kernel/irq.c | 9 ++-
arch/alpha/kernel/irq_alpha.c | 13 ++++
arch/alpha/kernel/perf_regs.c | 86 ++++++++++++++++++++++
arch/alpha/kernel/vmlinux.lds.S | 11 +++
arch/alpha/mm/fault.c | 29 ++++++++
arch/alpha/mm/init.c | 5 ++
17 files changed, 248 insertions(+), 9 deletions(-)
---
base-commit: f321329c1b70835e6b0807fddac6d4117e5604fc
change-id: 20260904-arch-kconfig-options-v2-8efa959ffcbd
Best regards,
--
Matt Turner <[email protected]>
