From 5bf6d1b92715f224ef6e1c3abca5dd63eeb4915d Mon Sep 17 00:00:00 2001 From: Mark Salyzyn Date: Thu, 1 Sep 2016 08:13:46 -0700 Subject: 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 Signed-off-by: Kees Cook --- include/linux/pstore_ram.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'include/linux/pstore_ram.h') 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 #include +#include #include #include #include -#include 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); -- cgit v1.2.3