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Message-ID: <20150513162757.GA21894@x> Date: Wed, 13 May 2015 09:27:57 -0700 From: Josh Triplett <josh@...htriplett.org> To: Ingo Molnar <mingo@...nel.org> Cc: Borislav Petkov <bp@...en8.de>, Andrew Morton <akpm@...ux-foundation.org>, Jonathan Corbet <corbet@....net>, Peter Zijlstra <peterz@...radead.org>, Andy Lutomirski <luto@...capital.net>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-api@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org, linux-arch@...r.kernel.org Subject: Re: [RFC PATCH v6] Documentation/arch: Add Documentation/arch-features.txt On Wed, May 13, 2015 at 03:48:42PM +0200, Ingo Molnar wrote: > From 93f6bd67b4348bf4bf27cbac8ffa9f1def4fa6aa Mon Sep 17 00:00:00 2001 > From: Ingo Molnar <mingo@...nel.org> > Date: Wed, 13 May 2015 10:30:11 +0200 > Subject: [PATCH] Documentation/arch: Add Documentation/arch-features.txt > > Add a support matrix for various generic kernel features that need > architecture support. > > Signed-off-by: Ingo Molnar <mingo@...nel.org> Could you add a column for the bpf JIT? Should this file track syscalls not wired up on architectures? How likely is this to get out of date? Are people going to remember to patch this when they add a feature to their architecture? If they found out they had work to do by reading this file, which is the goal, then they'll likely remember to edit the file; however, if they find the feature and fix it without knowing about the file, will someone notice? Is there any way we can *generate* this file from Kconfig? Can we extract the necessary "this is possible to enable" or "this arch selects this symbol" information from Kconfig, and together with the list of symbols for features needing architecture support, generate the table? If we can't generate this, then the ASCII-art style and right-aligned feature names seems *really* likely to produce spurious conflicts, especially when adding a feature to the list. Even though it would produce a much longer file, would you consider dropping the tables and just having a section per feature? That also avoids the need to abbreviate as much. For instance: Transparent huge pages HAVE_ARCH_TRANSPARENT_HUGEPAGE && 64BIT alpha TODO arc .. arm ok arm64 ok avr32 .. blackfin .. c6x .. cris .. frv .. hexagon .. ia64 TODO m32r .. m68k .. metag .. microblaze .. mips ok mn10300 .. nios2 .. openrisc .. parisc TODO powerpc ok s390 ok score .. sh .. sparc ok tile TODO um .. unicore32 .. x86 ok xtensa .. Or alternatively: Transparent huge pages HAVE_ARCH_TRANSPARENT_HUGEPAGE && 64BIT TODO: alpha ia64 parisc tile Done: arm arm64 mips powerpc s390 sparc x86 Not possible: arc avr32 blackfin c6x cris frv hexagon m32r m68k metag microblaze mn10300 nios2 openrisc score sh um unicore32 xtensa After all, the point of this document isn't to look at, it's to use as a TODO list and actively edit. So anything that makes it prettier but more painful to edit seems like a bug. > Documentation/arch-features.txt | 222 ++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 222 insertions(+) > > diff --git a/Documentation/arch-features.txt b/Documentation/arch-features.txt > new file mode 100644 > index 000000000000..4f6430bc552b > --- /dev/null > +++ b/Documentation/arch-features.txt > @@ -0,0 +1,222 @@ > + > +For generic kernel features that need architecture support, this is > +the feature support matrix, for all upstream Linux architectures. > + > +Meaning of entries in the tables: > + > + ' ok ': feature supported by the architecture > + 'TODO': feature not yet supported by the architecture > + ' .. ': feature cannot be supported by the hardware > + > + > + > + lockdep: LOCKDEP_SUPPORT > + stackprotector: HAVE_CC_STACKPROTECTOR > + jump labels: HAVE_ARCH_JUMP_LABEL > + seccomp filter: HAVE_ARCH_SECCOMP_FILTER > + context tracking: HAVE_CONTEXT_TRACKING > + kgdb: HAVE_ARCH_KGDB > + modern timekeeping: !ARCH_USES_GETTIMEOFFSET > + clockevents: GENERIC_CLOCKEVENTS > + ELF ASLR: ARCH_HAS_ELF_RANDOMIZE > + > + lockdep:---------------------------------------------------------. > + stackprotector:--------------------------------------------------. | > + jump labels:-------------------------------------------. | | > + seccomp filter:------------------------------------. | | | > + context tracking:-----------------------------. | | | | > + kgdb:----------------------. | | | | | > + modern timekeeping:---------------. | | | | | | > + clockevents:--------. | | | | | | | > + ELF ASLR:-. | | | | | | | | > + | | | | | | | | | > +---------------------------------------------------------------------------------- > + alpha | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | TODO | > + arc | TODO | ok | ok | ok | TODO | TODO | TODO | TODO | ok | > + arm | ok | ok | TODO | ok | ok | ok | ok | ok | ok | > + arm64 | ok | ok | ok | ok | ok | ok | ok | ok | ok | > + avr32 | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | ok | > + blackfin | TODO | ok | TODO | ok | TODO | TODO | TODO | TODO | ok | > + c6x | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | TODO | > + cris | TODO | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + frv | TODO | TODO | ok | TODO | TODO | TODO | TODO | TODO | TODO | > + hexagon | TODO | ok | ok | ok | TODO | TODO | TODO | TODO | ok | > + ia64 | TODO | TODO | ok | TODO | TODO | TODO | TODO | TODO | TODO | > + m32r | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + m68k | TODO | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + metag | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | ok | > + microblaze | TODO | ok | ok | ok | TODO | TODO | TODO | TODO | ok | > + mips | ok | ok | ok | ok | ok | ok | ok | ok | ok | > + mn10300 | TODO | ok | ok | ok | TODO | TODO | TODO | TODO | TODO | > + nios2 | TODO | ok | ok | ok | TODO | TODO | TODO | TODO | TODO | > + openrisc | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | TODO | > + parisc | TODO | TODO | ok | TODO | TODO | TODO | TODO | TODO | TODO | > + powerpc | ok | ok | ok | ok | ok | TODO | ok | TODO | ok | > + s390 | ok | ok | ok | TODO | TODO | ok | ok | TODO | ok | > + score | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | ok | > + sh | TODO | ok | ok | ok | TODO | TODO | TODO | ok | ok | > + sparc | TODO | ok | ok | ok | ok | TODO | ok | TODO | ok | > + tile | TODO | ok | ok | ok | ok | TODO | TODO | TODO | ok | > + um | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | ok | > + unicore32 | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | ok | > + x86 | ok | ok | ok | ok | ok | ok | ok | ok | ok | > + xtensa | TODO | ok | ok | TODO | TODO | TODO | TODO | TODO | ok | > +---------------------------------------------------------------------------------- > + > + > +arch tick broadcast: ARCH_HAS_TICK_BROADCAST > + kprobes: HAVE_KPROBES > + optprobes: HAVE_OPTPROBES > + kprobes on ftrace: HAVE_KPROBES_ON_FTRACE > + uprobes: ARCH_SUPPORTS_UPROBES > + kretprobes: HAVE_KRETPROBES > + user ret profiler: HAVE_USER_RETURN_NOTIFIER > + ioremap_prot(): HAVE_IOREMAP_PROT > + tracehook: HAVE_ARCH_TRACEHOOK > + > +arch tick broadcast:---------------------------------------------------------. > + kprobes:--------------------------------------------------. | > + optprobes:-------------------------------------------. | | > + kprobes on ftrace:------------------------------------. | | | > + uprobes:-----------------------------. | | | | > + kretprobes:----------------------. | | | | | > + user ret profiler:---------------. | | | | | | > + ioremap_prot():--------. | | | | | | | > + tracehook:-. | | | | | | | | > + | | | | | | | | | > +---------------------------------------------------------------------------------- > + alpha | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + arc | ok | ok | TODO | ok | TODO | TODO | TODO | ok | TODO | > + arm | ok | TODO | TODO | ok | ok | TODO | ok | ok | ok | > + arm64 | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | > + avr32 | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | TODO | > + blackfin | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + c6x | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + cris | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + frv | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + hexagon | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + ia64 | ok | TODO | TODO | ok | TODO | TODO | TODO | ok | TODO | > + m32r | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + m68k | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + metag | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + microblaze | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + mips | ok | TODO | TODO | ok | TODO | TODO | TODO | ok | ok | > + mn10300 | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + nios2 | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + openrisc | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + parisc | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + powerpc | ok | ok | TODO | ok | ok | TODO | TODO | ok | ok | > + s390 | ok | TODO | TODO | ok | ok | TODO | TODO | ok | TODO | > + score | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + sh | ok | ok | TODO | ok | TODO | TODO | TODO | ok | TODO | > + sparc | ok | TODO | TODO | ok | TODO | TODO | TODO | ok | TODO | > + tile | ok | ok | ok | ok | TODO | TODO | ok | ok | TODO | > + um | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + unicore32 | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + x86 | ok | ok | ok | ok | ok | ok | ok | ok | TODO | > + xtensa | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > +---------------------------------------------------------------------------------- > + > + > +generic idle thread: GENERIC_SMP_IDLE_THREAD > + dma_*map*_attrs(): HAVE_DMA_ATTRS > + dma contiguous: HAVE_DMA_CONTIGUOUS > + kprobes event: HAVE_REGS_AND_STACK_ACCESS_API > + dma api debug: HAVE_DMA_API_DEBUG > + perf regs: HAVE_PERF_REGS > + perf stackdump: HAVE_PERF_USER_STACK_DUMP > + cmpxchg local: HAVE_CMPXCHG_LOCAL > + virt cpuacct: HAVE_VIRT_CPU_ACCOUNTING || 64BIT > + > +generic idle thread:---------------------------------------------------------. > + dma_*map*_attrs():--------------------------------------------------. | > + dma contiguous:-------------------------------------------. | | > + kprobes event:------------------------------------. | | | > + dma api debug:-----------------------------. | | | | > + perf regs:----------------------. | | | | | > + perf stackdump:---------------. | | | | | | > + cmpxchg local:--------. | | | | | | | > + virt cpuacct:-. | | | | | | | | > + | | | | | | | | | > +---------------------------------------------------------------------------------- > + alpha | ok | TODO | TODO | TODO | TODO | TODO | TODO | ok | ok | > + arc | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | > + arm | ok | TODO | ok | ok | ok | ok | ok | ok | ok | > + arm64 | ok | TODO | ok | ok | ok | TODO | ok | ok | ok | > + avr32 | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + blackfin | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | > + c6x | TODO | TODO | TODO | TODO | ok | TODO | TODO | TODO | TODO | > + cris | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + frv | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + hexagon | TODO | TODO | TODO | TODO | TODO | ok | TODO | ok | ok | > + ia64 | ok | TODO | TODO | TODO | ok | TODO | TODO | ok | ok | > + m32r | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + m68k | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + metag | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | > + microblaze | TODO | TODO | TODO | TODO | ok | TODO | TODO | ok | TODO | > + mips | ok | TODO | TODO | TODO | ok | TODO | ok | ok | ok | > + mn10300 | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + nios2 | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + openrisc | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | TODO | > + parisc | ok | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | > + powerpc | ok | TODO | TODO | TODO | ok | ok | TODO | ok | ok | > + s390 | ok | ok | TODO | TODO | ok | ok | TODO | ok | ok | > + score | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + sh | TODO | TODO | TODO | TODO | ok | ok | TODO | ok | ok | > + sparc | ok | TODO | TODO | TODO | ok | TODO | TODO | ok | ok | > + tile | ok | TODO | TODO | TODO | ok | ok | TODO | ok | TODO | > + um | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + unicore32 | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | TODO | > + x86 | ok | ok | ok | ok | ok | ok | ok | ok | ok | > + xtensa | TODO | TODO | TODO | TODO | TODO | TODO | TODO | TODO | ok | > +---------------------------------------------------------------------------------- > + > + > + irq time acct: HAVE_IRQ_TIME_ACCOUNTING > + THP: HAVE_ARCH_TRANSPARENT_HUGEPAGE && 64BIT > + gcov profile all: ARCH_HAS_GCOV_PROFILE_ALL > + rwsem optimized: Optimized asm/rwsem.h > + queued spinlocks: ARCH_USE_QUEUED_SPINLOCKS > + queued rwlocks: ARCH_USE_QUEUED_RWLOCKS > + numa balancing: ARCH_SUPPORTS_NUMA_BALANCING && 64BIT && NUMA > + > + irq time acct:-------------------------------------------. > + THP:------------------------------------. | > + gcov profile all:-----------------------------. | | > + rwsem optimized:----------------------. | | | > + queued spinlocks:---------------. | | | | > + queued rwlocks:--------. | | | | | > + numa balancing:-. | | | | | | > + | | | | | | | > +-------------------------------------------------------------------- > + alpha | TODO | TODO | TODO | ok | TODO | TODO | TODO | > + arc | .. | TODO | TODO | TODO | TODO | .. | TODO | > + arm | .. | TODO | TODO | TODO | ok | ok | ok | > + arm64 | .. | TODO | TODO | TODO | ok | ok | TODO | > + avr32 | .. | TODO | TODO | TODO | TODO | .. | TODO | > + blackfin | .. | TODO | TODO | TODO | TODO | .. | TODO | > + c6x | .. | TODO | TODO | TODO | TODO | .. | TODO | > + cris | .. | TODO | TODO | TODO | TODO | .. | TODO | > + frv | .. | TODO | TODO | TODO | TODO | .. | TODO | > + hexagon | .. | TODO | TODO | TODO | TODO | .. | TODO | > + ia64 | TODO | TODO | TODO | ok | TODO | TODO | TODO | > + m32r | .. | TODO | TODO | TODO | TODO | .. | TODO | > + m68k | .. | TODO | TODO | TODO | TODO | .. | TODO | > + metag | .. | TODO | TODO | TODO | TODO | .. | TODO | > + microblaze | .. | TODO | TODO | TODO | ok | .. | TODO | > + mips | TODO | TODO | TODO | TODO | TODO | ok | ok | > + mn10300 | .. | TODO | TODO | TODO | TODO | .. | TODO | > + nios2 | .. | TODO | TODO | TODO | TODO | .. | TODO | > + openrisc | .. | TODO | TODO | TODO | TODO | .. | TODO | > + parisc | .. | TODO | TODO | TODO | TODO | TODO | TODO | > + powerpc | ok | TODO | TODO | TODO | ok | ok | TODO | > + s390 | .. | TODO | TODO | ok | ok | ok | TODO | > + score | .. | TODO | TODO | TODO | TODO | .. | TODO | > + sh | .. | TODO | TODO | ok | ok | .. | TODO | > + sparc | TODO | TODO | TODO | ok | TODO | ok | TODO | > + tile | TODO | TODO | TODO | TODO | TODO | TODO | TODO | > + um | .. | TODO | TODO | TODO | TODO | .. | TODO | > + unicore32 | .. | TODO | TODO | TODO | TODO | .. | TODO | > + x86 | ok | ok | ok | ok | ok | ok | ok | > + xtensa | .. | TODO | TODO | ok | TODO | .. | ok | > +-------------------------------------------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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