diff options
| author | Mark Salyzyn <salyzyn@android.com> | 2016-09-01 08:13:46 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2016-09-08 15:01:10 -0700 |
| commit | 5bf6d1b92715f224ef6e1c3abca5dd63eeb4915d (patch) | |
| tree | 09139364ae61fbb0b188c0a762861bf800b70d23 /include/linux/pstore_ram.h | |
| parent | 79d955af711a6e20207783590a2cfddbd649568b (diff) | |
| download | lwn-5bf6d1b92715f224ef6e1c3abca5dd63eeb4915d.tar.gz lwn-5bf6d1b92715f224ef6e1c3abca5dd63eeb4915d.zip | |
pstore/pmsg: drop bounce buffer
Removing a bounce buffer copy operation in the pmsg driver path is
always better. We also gain in overall performance by not requesting
a vmalloc on every write as this can cause precious RT tasks, such
as user facing media operation, to stall while memory is being
reclaimed. Added a write_buf_user to the pstore functions, a backup
platform write_buf_user that uses the small buffer that is part of
the instance, and implemented a ramoops write_buf_user that only
supports PSTORE_TYPE_PMSG.
Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'include/linux/pstore_ram.h')
| -rw-r--r-- | include/linux/pstore_ram.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h index 4660aaa3195e..c668c861c96c 100644 --- a/include/linux/pstore_ram.h +++ b/include/linux/pstore_ram.h @@ -17,11 +17,12 @@ #ifndef __LINUX_PSTORE_RAM_H__ #define __LINUX_PSTORE_RAM_H__ +#include <linux/compiler.h> #include <linux/device.h> +#include <linux/init.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/types.h> -#include <linux/init.h> struct persistent_ram_buffer; struct rs_control; @@ -59,7 +60,9 @@ void persistent_ram_free(struct persistent_ram_zone *prz); void persistent_ram_zap(struct persistent_ram_zone *prz); int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, - unsigned int count); + unsigned int count); +int persistent_ram_write_user(struct persistent_ram_zone *prz, + const void __user *s, unsigned int count); void persistent_ram_save_old(struct persistent_ram_zone *prz); size_t persistent_ram_old_size(struct persistent_ram_zone *prz); |