android_kernel_xiaomi_sm8350/include/asm-s390/scatterlist.h
Jens Axboe 18dabf473e Change table chaining layout
Change the page member of the scatterlist structure to be an unsigned
long, and encode more stuff in the lower bits:

- Bits 0 and 1 zero: this is a normal sg entry. Next sg entry is located
  at sg + 1.
- Bit 0 set: this is a chain entry, the next real entry is at ->page_link
  with the two low bits masked off.
- Bit 1 set: this is the final entry in the sg entry. sg_next() will return
  NULL when passed such an entry.

It's thus important that sg table users use the proper accessors to get
and set the page member.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-22 21:20:01 +02:00

17 lines
325 B
C

#ifndef _ASMS390_SCATTERLIST_H
#define _ASMS390_SCATTERLIST_H
struct scatterlist {
unsigned long page_link;
unsigned int offset;
unsigned int length;
};
#ifdef __s390x__
#define ISA_DMA_THRESHOLD (0xffffffffffffffffUL)
#else
#define ISA_DMA_THRESHOLD (0xffffffffUL)
#endif
#endif /* _ASMS390X_SCATTERLIST_H */