openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[PARISC] Untangle <asm/processor.h> header include mess 

asm/processor.h on parisc wants spinlocks for cpuinfo, but
linux/spinlock_types.h needs lockdep, and lockdep wants prefetch.

This leads to a horrible circular dependancy, because <asm/processor.h>
is including something which depends on things which are not defined
until the end of the file.

Kludge around this by moving prefetch related code into <asm/prefetch.h>
and including it before <linux/spinlock_types.h>, however this is just
a temporary solution until this mess can be cleaned up.

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Kyle McMartin 2006-08-13 22:15:47 -04:00 committed by Matthew Wilcox
parent 78b656b8bf
commit 4068d93cd1
2 changed files with 38 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
include/asm-parisc/prefetch.h Normal file
View File

@ -0,0 +1,36 @@
/*
* include/asm-parisc/prefetch.h
*
* PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book.
* In addition, many implementations do hardware prefetching of both
* instructions and data.
*
* PA7300LC (page 14-4 of the ERS) also implements prefetching by a load
* to gr0 but not in a way that Linux can use. If the load would cause an
* interruption (eg due to prefetching 0), it is suppressed on PA2.0
* processors, but not on 7300LC.
*
*/
#ifndef __ASM_PARISC_PREFETCH_H
#define __ASM_PARISC_PREFETCH_H
#ifndef __ASSEMBLY__
#ifdef CONFIG_PREFETCH
#define ARCH_HAS_PREFETCH
extern inline void prefetch(const void *addr)
{
__asm__("ldw 0(%0), %%r0" : : "r" (addr));
}
#define ARCH_HAS_PREFETCHW
extern inline void prefetchw(const void *addr)
{
__asm__("ldd 0(%0), %%r0" : : "r" (addr));
}
#endif /* CONFIG_PREFETCH */
#endif /* __ASSEMBLY__ */
#endif /* __ASM_PARISC_PROCESSOR_H */

28
include/asm-parisc/processor.h
View File

@ -9,6 +9,8 @@
#define __ASM_PARISC_PROCESSOR_H
#ifndef __ASSEMBLY__
#include <asm/prefetch.h> /* lockdep.h needs <linux/prefetch.h> */
#include <linux/threads.h>
#include <linux/spinlock_types.h>
@ -328,32 +330,6 @@ extern unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
/*
* PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book.
* In addition, many implementations do hardware prefetching of both
* instructions and data.
*
* PA7300LC (page 14-4 of the ERS) also implements prefetching by a load
* to gr0 but not in a way that Linux can use. If the load would cause an
* interruption (eg due to prefetching 0), it is suppressed on PA2.0
* processors, but not on 7300LC.
*/
#ifdef CONFIG_PREFETCH
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
extern inline void prefetch(const void *addr)
{
__asm__("ldw 0(%0), %%r0" : : "r" (addr));
}
extern inline void prefetchw(const void *addr)
{
__asm__("ldd 0(%0), %%r0" : : "r" (addr));
}
#endif
#define cpu_relax() barrier()
#endif /* __ASSEMBLY__ */