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Subject[RFC PATCH 0/3] Documentation/features: Provide and apply "features-refresh.sh"
Date
In Ingo's words [1]:

"[...] what should be done instead is to write a script that refreshes
all the arch-support.txt files in-place. [...]

It's OK for the script to have various quirks for weirdly implemented
features and exceptions: i.e. basically whenever it gets a feature wrong,
we can just tweak the script with quirks to make it all work out of box.

[...] But in the end there should only be a single new script:

Documentation/features/scripts/features-refresh.sh

... which operates on the arch-support.txt files and refreshes them in
place, and which, after all the refreshes have been committed, should
produce an empty 'git diff' result."

"[...] New features can then be added by basically just creating a
header-only arch-support.txt file, such as:

triton:~/tip/Documentation/features> cat foo/bar/arch-support.txt
#
# Feature name: shiny new fubar kernel feature
# Kconfig: ARCH_USE_FUBAR
# description: arch supports the fubar feature
#

And running Documentation/features/scripts/features-refresh.sh would
auto-generate the arch support matrix. [...]

This way we soft- decouple the refreshing of the entries from the
introduction of the features, while still making it all easy to keep
sync and to extend."

This RFC presents a first attempt to implement such a feature/script, and
applies it script on top of Arnd's:

git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git arch-removal

Patch 1/3 provides the "features-refresh.sh" script. Patch 2/3 removes the
"BPF-JIT" feature file and it creates header-only files for "cBPF-JIT" and
"eBPF-JIT". Patch 3/3 presents the results of running the script; this run
also printed to standard output the following warnings:

WARNING: '__HAVE_ARCH_STRNCASECMP' is not a valid Kconfig
WARNING: 'Optimized asm/rwsem.h' is not a valid Kconfig
WARNING: '!ARCH_USES_GETTIMEOFFSET' is not a valid Kconfig
WARNING: '__HAVE_ARCH_PTE_SPECIAL' is not a valid Kconfig

(I'm sending these patches with empty commit messagges, for early feedback:
I'll fill in these messages in subsequent versions if this makes sense...)

Cheers,
Andrea

Andrea Parri (3):
Documentation/features: Add script that refreshes the arch support
status files in place
Documentation/features/core: Add arch support status files for
'cBPF-JIT' and 'eBPF-JIT'
Documentation/features: Refresh and auto-generate the arch support
status files in place

.../features/core/BPF-JIT/arch-support.txt | 31 ------------
.../features/core/cBPF-JIT/arch-support.txt | 32 +++++++++++++
.../features/core/eBPF-JIT/arch-support.txt | 32 +++++++++++++
.../core/generic-idle-thread/arch-support.txt | 3 +-
.../features/core/jump-labels/arch-support.txt | 1 +
.../features/core/tracehook/arch-support.txt | 1 +
.../features/debug/KASAN/arch-support.txt | 3 +-
.../debug/gcov-profile-all/arch-support.txt | 1 +
Documentation/features/debug/kgdb/arch-support.txt | 3 +-
.../debug/kprobes-on-ftrace/arch-support.txt | 1 +
.../features/debug/kprobes/arch-support.txt | 3 +-
.../features/debug/kretprobes/arch-support.txt | 3 +-
.../features/debug/optprobes/arch-support.txt | 3 +-
.../features/debug/stackprotector/arch-support.txt | 1 +
.../features/debug/uprobes/arch-support.txt | 5 +-
.../debug/user-ret-profiler/arch-support.txt | 1 +
.../features/io/dma-api-debug/arch-support.txt | 1 +
.../features/io/dma-contiguous/arch-support.txt | 3 +-
.../features/io/sg-chain/arch-support.txt | 1 +
.../features/lib/strncasecmp/arch-support.txt | 1 +
.../locking/cmpxchg-local/arch-support.txt | 3 +-
.../features/locking/lockdep/arch-support.txt | 3 +-
.../locking/queued-rwlocks/arch-support.txt | 9 ++--
.../locking/queued-spinlocks/arch-support.txt | 7 +--
.../locking/rwsem-optimized/arch-support.txt | 1 +
.../features/perf/kprobes-event/arch-support.txt | 5 +-
.../features/perf/perf-regs/arch-support.txt | 3 +-
.../features/perf/perf-stackdump/arch-support.txt | 3 +-
.../sched/membarrier-sync-core/arch-support.txt | 1 +
.../features/sched/numa-balancing/arch-support.txt | 5 +-
Documentation/features/scripts/features-refresh.sh | 55 ++++++++++++++++++++++
.../seccomp/seccomp-filter/arch-support.txt | 5 +-
.../time/arch-tick-broadcast/arch-support.txt | 3 +-
.../features/time/clockevents/arch-support.txt | 3 +-
.../time/context-tracking/arch-support.txt | 1 +
.../features/time/irq-time-acct/arch-support.txt | 3 +-
.../time/modern-timekeeping/arch-support.txt | 1 +
.../features/time/virt-cpuacct/arch-support.txt | 1 +
.../features/vm/ELF-ASLR/arch-support.txt | 3 +-
.../features/vm/PG_uncached/arch-support.txt | 1 +
Documentation/features/vm/THP/arch-support.txt | 1 +
Documentation/features/vm/TLB/arch-support.txt | 1 +
.../features/vm/huge-vmap/arch-support.txt | 1 +
.../features/vm/ioremap_prot/arch-support.txt | 1 +
.../features/vm/numa-memblock/arch-support.txt | 3 +-
.../features/vm/pte_special/arch-support.txt | 1 +
46 files changed, 192 insertions(+), 62 deletions(-)
delete mode 100644 Documentation/features/core/BPF-JIT/arch-support.txt
create mode 100644 Documentation/features/core/cBPF-JIT/arch-support.txt
create mode 100644 Documentation/features/core/eBPF-JIT/arch-support.txt
create mode 100755 Documentation/features/scripts/features-refresh.sh

--
2.7.4

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