3843384a05
With dma based spi transmission, data corruption is observed occasionally. With dma buffers located right next to msg and xfer fields, cache lines correctly flushed in preparation for dma usage may be polluted again when writing to fields in the same cache line. Make sure cache fields used with dma do not share cache lines with fields changed during dma handling. As both fields are part of a struct that is allocated via kzalloc, thus cache aligned, moving the fields to the 1st position and insert padding for alignment does the job. Signed-off-by: Oskar Schirmer <os@emlix.com> Signed-off-by: Daniel Glöckner <dg@emlix.com> Signed-off-by: Oliver Schneidewind <osw@emlix.com> Signed-off-by: Johannes Weiner <jw@emlix.com> Acked-by: Mike Frysinger <vapier@gentoo.org> [dtor@mail.ru - changed to use ___cacheline_aligned as suggested by akpm] Signed-off-by: Dmitry Torokhov <dtor@mail.ru> |
||
|---|---|---|
| .. | ||
| gameport | ||
| joystick | ||
| keyboard | ||
| misc | ||
| mouse | ||
| serio | ||
| tablet | ||
| touchscreen | ||
| apm-power.c | ||
| evbug.c | ||
| evdev.c | ||
| ff-core.c | ||
| ff-memless.c | ||
| fixp-arith.h | ||
| input-compat.c | ||
| input-compat.h | ||
| input-polldev.c | ||
| input.c | ||
| joydev.c | ||
| Kconfig | ||
| Makefile | ||
| mousedev.c | ||
| sparse-keymap.c | ||
| xen-kbdfront.c | ||