2011-06-04 20:52:05 +02:00
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2012-04-10 10:49:13 +02:00
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header-y += ucontext.h
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2011-06-04 20:52:05 +02:00
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generic-y += atomic.h
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generic-y += auxvec.h
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2012-03-28 19:30:03 +02:00
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generic-y += barrier.h
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2011-06-04 20:52:05 +02:00
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generic-y += bitsperlong.h
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generic-y += bug.h
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generic-y += bugs.h
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generic-y += cacheflush.h
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generic-y += checksum.h
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2012-09-05 06:04:14 +02:00
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generic-y += clkdev.h
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2011-06-04 20:52:05 +02:00
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generic-y += cmpxchg-local.h
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2014-01-22 00:36:16 +01:00
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generic-y += cmpxchg.h
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2011-06-04 20:52:05 +02:00
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generic-y += cputime.h
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generic-y += current.h
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generic-y += device.h
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generic-y += div64.h
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generic-y += dma.h
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generic-y += emergency-restart.h
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generic-y += errno.h
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2012-03-28 19:30:03 +02:00
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generic-y += exec.h
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2011-06-04 20:52:05 +02:00
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generic-y += fb.h
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generic-y += fcntl.h
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generic-y += ftrace.h
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generic-y += futex.h
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generic-y += hardirq.h
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2014-01-22 00:36:16 +01:00
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generic-y += hash.h
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2011-06-04 20:52:05 +02:00
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generic-y += hw_irq.h
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generic-y += ioctl.h
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generic-y += ioctls.h
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generic-y += ipcbuf.h
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generic-y += irq_regs.h
|
2014-09-06 15:43:02 +02:00
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generic-y += irq_work.h
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2011-06-04 20:52:05 +02:00
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generic-y += kdebug.h
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generic-y += kmap_types.h
|
2012-10-24 17:56:33 +02:00
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generic-y += kvm_para.h
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2011-06-04 20:52:05 +02:00
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generic-y += local.h
|
2014-01-22 00:36:22 +01:00
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generic-y += mcs_spinlock.h
|
2011-06-04 20:52:05 +02:00
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generic-y += mman.h
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generic-y += module.h
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generic-y += msgbuf.h
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generic-y += pci.h
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generic-y += percpu.h
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generic-y += poll.h
|
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generic-y += posix_types.h
|
2014-01-22 00:36:16 +01:00
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generic-y += preempt.h
|
2011-06-04 20:52:05 +02:00
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|
|
generic-y += resource.h
|
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generic-y += scatterlist.h
|
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|
generic-y += sections.h
|
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|
generic-y += segment.h
|
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|
|
generic-y += sembuf.h
|
|
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|
|
generic-y += setup.h
|
|
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|
|
generic-y += shmbuf.h
|
|
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|
|
generic-y += shmparam.h
|
|
|
|
|
generic-y += siginfo.h
|
|
|
|
|
generic-y += signal.h
|
|
|
|
|
generic-y += socket.h
|
|
|
|
|
generic-y += sockios.h
|
|
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|
|
generic-y += stat.h
|
2014-01-22 00:36:16 +01:00
|
|
|
generic-y += statfs.h
|
2011-06-04 20:52:05 +02:00
|
|
|
generic-y += string.h
|
|
|
|
|
generic-y += swab.h
|
2014-01-22 00:36:16 +01:00
|
|
|
generic-y += switch_to.h
|
2011-06-04 20:52:05 +02:00
|
|
|
generic-y += termbits.h
|
|
|
|
|
generic-y += termios.h
|
|
|
|
|
generic-y += topology.h
|
2012-11-13 21:18:21 +01:00
|
|
|
generic-y += trace_clock.h
|
2011-06-04 20:52:05 +02:00
|
|
|
generic-y += types.h
|
|
|
|
|
generic-y += ucontext.h
|
|
|
|
|
generic-y += user.h
|
2013-07-30 09:58:11 +02:00
|
|
|
generic-y += vga.h
|
word-at-a-time: make the interfaces truly generic
This changes the interfaces in <asm/word-at-a-time.h> to be a bit more
complicated, but a lot more generic.
In particular, it allows us to really do the operations efficiently on
both little-endian and big-endian machines, pretty much regardless of
machine details. For example, if you can rely on a fast population
count instruction on your architecture, this will allow you to make your
optimized <asm/word-at-a-time.h> file with that.
NOTE! The "generic" version in include/asm-generic/word-at-a-time.h is
not truly generic, it actually only works on big-endian. Why? Because
on little-endian the generic algorithms are wasteful, since you can
inevitably do better. The x86 implementation is an example of that.
(The only truly non-generic part of the asm-generic implementation is
the "find_zero()" function, and you could make a little-endian version
of it. And if the Kbuild infrastructure allowed us to pick a particular
header file, that would be lovely)
The <asm/word-at-a-time.h> functions are as follows:
- WORD_AT_A_TIME_CONSTANTS: specific constants that the algorithm
uses.
- has_zero(): take a word, and determine if it has a zero byte in it.
It gets the word, the pointer to the constant pool, and a pointer to
an intermediate "data" field it can set.
This is the "quick-and-dirty" zero tester: it's what is run inside
the hot loops.
- "prep_zero_mask()": take the word, the data that has_zero() produced,
and the constant pool, and generate an *exact* mask of which byte had
the first zero. This is run directly *outside* the loop, and allows
the "has_zero()" function to answer the "is there a zero byte"
question without necessarily getting exactly *which* byte is the
first one to contain a zero.
If you do multiple byte lookups concurrently (eg "hash_name()", which
looks for both NUL and '/' bytes), after you've done the prep_zero_mask()
phase, the result of those can be or'ed together to get the "either
or" case.
- The result from "prep_zero_mask()" can then be fed into "find_zero()"
(to find the byte offset of the first byte that was zero) or into
"zero_bytemask()" (to find the bytemask of the bytes preceding the
zero byte).
The existence of zero_bytemask() is optional, and is not necessary
for the normal string routines. But dentry name hashing needs it, so
if you enable DENTRY_WORD_AT_A_TIME you need to expose it.
This changes the generic strncpy_from_user() function and the dentry
hashing functions to use these modified word-at-a-time interfaces. This
gets us back to the optimized state of the x86 strncpy that we lost in
the previous commit when moving over to the generic version.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-26 19:43:17 +02:00
|
|
|
generic-y += word-at-a-time.h
|
2013-05-14 09:26:17 +02:00
|
|
|
generic-y += xor.h
|
