On Wed, 13 May 2015 09:27:57 -0700 Josh Triplett <josh@xxxxxxxxxxxxxxxx> wrote:
> 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?
me2. The patch conflicts are going to be pretty bad.
I'd also prefer a format which allows us to add useful notes - it's a
bit hostile to say "thou shalt implement X" without providing any info
about how to do so. Where do we tell maintainers that there's a handy
test app in tools/testing/selftests which they should use?
This way, I can bug patch submitters with "hey, you forgot to update
Documentation/arch-features.txt" and they will add useful info while
it's all still hot in their minds.
And there's a ton of stuff which can go in here, much of it not
immediately apparent.
Just grepping 9 months worth of the stuff I've handled, I'm seeing
things like
HAVE_ARCH_KASAN
__HAVE_ARCH_PMDP_SPLITTING_FLUSH
__HAVE_ARCH_PTE_SPECIAL
__HAVE_ARCH_GATE_AREA
ARCH_HAVE_ELF_ASLR
ARCH_HAS_GCOV_PROFILE_ALL
CONFIG_ARCH_USE_BUILTIN_BSWAP
HAVE_ARCH_HUGE_VMAP
ARCH_HAS_SG_CHAIN
__HAVE_ARCH_STRNCASECMP
ARCH_HAS_ELF_RANDOMIZE
CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
CONFIG_ARCH_USES_PG_UNCACHED
CONFIG_ARCH_HAS_WALK_MEMORY
and things which don't contain ARCH
HAVE_GENERIC_RCU_GUP
HAVE_RCU_TABLE_FREE
HAVE_GENERIC_RCU_GUP
CONFIG_HAVE_CLK
CONFIG_HAVE_IOREMAP_PROT
CONFIG_HAVE_MEMBLOCK_NODE_MAP
And then there's the increasingly common
arch/include/asm/foo.h:
static inline void wibble(...)
{
...
}
#define wibble wibble
include/linux/foo.h:
#ifndef wibble
static inline void wibble(...)
{
...
}
#define wibble
#endif
which is going to be hard to grep for....
ugh, this thing's going to be enormous. People will go insane reading
it, so each section should have a sentence describing what the feature
does so maintainers can make quick decisions about whether they should
bother.
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