Pallipadi, Venkatesh e888d7facd x86, delay: tsc based udelay should have rdtsc_barrier ... delay_tsc needs rdtsc_barrier to provide proper delay. Output from a test driver using hpet to cross check delay provided by udelay(). Before: [ 86.794363] Expected delay 5us actual 4679ns [ 87.154362] Expected delay 5us actual 698ns [ 87.514162] Expected delay 5us actual 4539ns [ 88.653716] Expected delay 5us actual 4539ns [ 94.664106] Expected delay 10us actual 9638ns [ 95.049351] Expected delay 10us actual 10126ns [ 95.416110] Expected delay 10us actual 9568ns [ 95.799216] Expected delay 10us actual 9638ns [ 103.624104] Expected delay 10us actual 9707ns [ 104.020619] Expected delay 10us actual 768ns [ 104.419951] Expected delay 10us actual 9707ns After: [ 50.983320] Expected delay 5us actual 5587ns [ 51.261807] Expected delay 5us actual 5587ns [ 51.565715] Expected delay 5us actual 5657ns [ 51.861171] Expected delay 5us actual 5587ns [ 52.164704] Expected delay 5us actual 5726ns [ 52.487457] Expected delay 5us actual 5657ns [ 52.789338] Expected delay 5us actual 5726ns [ 57.119680] Expected delay 10us actual 10755ns [ 57.893997] Expected delay 10us actual 10615ns [ 58.261287] Expected delay 10us actual 10755ns [ 58.620505] Expected delay 10us actual 10825ns [ 58.941035] Expected delay 10us actual 10755ns [ 59.320903] Expected delay 10us actual 10615ns [ 61.306311] Expected delay 10us actual 10755ns [ 61.520542] Expected delay 10us actual 10615ns Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>		2009-06-25 16:47:40 -07:00
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checksum_32.S
clear_page_64.S
copy_page_64.S
copy_user_64.S
copy_user_nocache_64.S
csum-copy_64.S
csum-partial_64.c
csum-wrappers_64.c
delay.c	x86, delay: tsc based udelay should have rdtsc_barrier	2009-06-25 16:47:40 -07:00
getuser.S
io_64.c
iomap_copy_64.S
Makefile	x86: MSR: add a struct representation of an MSR	2009-06-10 12:18:42 +02:00
memcpy_32.c
memcpy_64.S	x86: memcpy, clean up	2009-03-12 12:21:17 +01:00
memmove_64.c
memset_64.S
mmx_32.c
msr.c	x86: MSR: add methods for writing of an MSR on several CPUs	2009-06-10 12:18:43 +02:00
putuser.S
rwlock_64.S
semaphore_32.S
string_32.c
strstr_32.c
thunk_32.S
thunk_64.S
usercopy_32.c
usercopy_64.c	x86, 64-bit: Clean up user address masking	2009-06-20 15:40:00 -07:00