linux-dev/include/asm-cris/arch-v32/spinlock.h, branch masterLinux kernel development work - see feature brancheshttps://git.zx2c4.com/linux-dev/atom/include/asm-cris/arch-v32/spinlock.h?h=master2008-10-29T16:29:44Z[CRIS] Move header files from include to arch/cris/include.2008-10-29T16:29:44ZJesper Nilssonjesper.nilsson@axis.com2008-10-21T15:45:58Zurn:sha1:556dcee7b829e5c350c3ffdbdb87a8b15aa3c5d3
Change all users of header files to correct path.
Remove some unneeded headers for arch-v32.
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
CRIS v32: Completely rework spinlocks for ETRAX FS and ARTPEC-32008-02-08T10:06:39ZJesper Nilssonjesper.nilsson@axis.com2008-01-28T17:07:58Zurn:sha1:de1c1419f9eb8f9d719aaaa3e3f3073069ecd657[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks2006-10-01T07:39:21ZMartin Schwidefskyschwidefsky@de.ibm.com2006-10-01T06:27:43Zurn:sha1:ef6edc9746dc2bfdacf44eefd5f881179971c478
On systems running with virtual cpus there is optimization potential in
regard to spinlocks and rw-locks. If the virtual cpu that has taken a lock
is known to a cpu that wants to acquire the same lock it is beneficial to
yield the timeslice of the virtual cpu in favour of the cpu that has the
lock (directed yield).
With CONFIG_PREEMPT="n" this can be implemented by the architecture without
common code changes. Powerpc already does this.
With CONFIG_PREEMPT="y" the lock loops are coded with _raw_spin_trylock,
_raw_read_trylock and _raw_write_trylock in kernel/spinlock.c. If the lock
could not be taken cpu_relax is called. A directed yield is not possible
because cpu_relax doesn't know anything about the lock. To be able to
yield the lock in favour of the current lock holder variants of cpu_relax
for spinlocks and rw-locks are needed. The new _raw_spin_relax,
_raw_read_relax and _raw_write_relax primitives differ from cpu_relax
insofar that they have an argument: a pointer to the lock structure.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
[PATCH] CRIS update: new subarchitecture v322005-07-27T23:26:01ZMikael Starvikmikael.starvik@axis.com2005-07-27T18:44:44Zurn:sha1:51533b615e605d86154ec1b4e585c8ca1b0b15b7
New CRIS sub architecture named v32.
From: Dave Jones <davej@redhat.com>
Fix swapped kmalloc args
Signed-off-by: Mikael Starvik <starvik@axis.com>
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>