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authorJiri Olsa <jolsa@redhat.com>2011-02-07 21:31:25 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-17 22:13:19 +0300
commitfcdba07ee390d9d9c15de8b2a17baef689284fcc (patch)
tree607e8d1ca60006fd97c11e5c07740273d5b91895 /include/linux/vt_kern.h
parentdc1892c4bc6960121ca4c8023a07c815cfd689be (diff)
downloadlinux-fcdba07ee390d9d9c15de8b2a17baef689284fcc.tar.xz
tty,vcs removing con_buf/conf_buf_mtx
seems there's no longer need for using con_buf/conf_buf_mtx as vcs_read/vcs_write buffer for user's data. The do_con_write function, that was the other user of this, is currently using its own kmalloc-ed buffer. Not sure when this got changed, as I was able to find this code in 2.6.9, but it's already gone as far as current git history goes - 2.6.12-rc2. AFAICS there's a behaviour change with the current change. The lseek is not completely mutually exclusive with the vcs_read/vcs_write - the file->f_pos might get updated via lseek callback during the vcs_read/vcs_write processing. I tried to find out if the prefered behaviour is to keep this in sync within read/write/lseek functions, but I did not find any pattern on different places. I guess if user end up calling write/lseek from different threads she should know what she's doing. If needed we could use dedicated fd mutex/buffer. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/vt_kern.h')
-rw-r--r--include/linux/vt_kern.h8
1 files changed, 0 insertions, 8 deletions
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index 6625cc1ab758..4d05e14ea60c 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -142,14 +142,6 @@ static inline bool vt_force_oops_output(struct vc_data *vc)
return false;
}
-/*
- * vc_screen.c shares this temporary buffer with the console write code so that
- * we can easily avoid touching user space while holding the console spinlock.
- */
-
-#define CON_BUF_SIZE (CONFIG_BASE_SMALL ? 256 : PAGE_SIZE)
-extern char con_buf[CON_BUF_SIZE];
-extern struct mutex con_buf_mtx;
extern char vt_dont_switch;
extern int default_utf8;
extern int global_cursor_default;