summaryrefslogtreecommitdiff
path: root/common/env_callback.c
diff options
context:
space:
mode:
authorHeiko Schocher <hs@denx.de>2013-12-19 13:45:04 +0100
committerTom Rini <trini@ti.com>2014-01-14 09:01:06 -0500
commit1b6102718bc5514cf974abeecebebe95c6a9ecc6 (patch)
tree2ebd35092871e6f5dce93498d9ad8e0899848aa3 /common/env_callback.c
parenta113fb39df43546c704aa8eba55720da9a9dfedd (diff)
downloadu-boot-imx-1b6102718bc5514cf974abeecebebe95c6a9ecc6.zip
u-boot-imx-1b6102718bc5514cf974abeecebebe95c6a9ecc6.tar.gz
u-boot-imx-1b6102718bc5514cf974abeecebebe95c6a9ecc6.tar.bz2
common, env: optimize boottime
when creating the hashtable, for each environmentvariable getenv(ENV_CALLBACK_VAR) and getenv(ENV_FLAGS_VAR) is called, which costs at this point a lot of time. So call this two getenv() calls only once. Boottime on the ids8313 board without this patch: 2013-12-19 13:38:22,894: NAND: 128 MiB 2013-12-19 13:38:27,659: In: serial (~4.8 sec) Bootime with this patch on the ids8313 board: 2013-12-19 13:40:25,332: NAND: 128 MiB 2013-12-19 13:40:25,546: In: serial (~0.2 sec) Signed-off-by: Heiko Schocher <hs@denx.de> Cc: Tom Rini <trini@ti.com> Cc: Joe Hershberger <joe.hershberger@ni.com> Cc: Wolfgang Denk <wd@denx.de>
Diffstat (limited to 'common/env_callback.c')
-rw-r--r--common/env_callback.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/common/env_callback.c b/common/env_callback.c
index 34bb58e..d03fa03 100644
--- a/common/env_callback.c
+++ b/common/env_callback.c
@@ -35,6 +35,9 @@ static struct env_clbk_tbl *find_env_callback(const char *name)
return NULL;
}
+static int first_call = 1;
+static const char *callback_list;
+
/*
* Look for a possible callback for a newly added variable
* This is called specifically when the variable did not exist in the hash
@@ -43,11 +46,15 @@ static struct env_clbk_tbl *find_env_callback(const char *name)
void env_callback_init(ENTRY *var_entry)
{
const char *var_name = var_entry->key;
- const char *callback_list = getenv(ENV_CALLBACK_VAR);
char callback_name[256] = "";
struct env_clbk_tbl *clbkp;
int ret = 1;
+ if (first_call) {
+ callback_list = getenv(ENV_CALLBACK_VAR);
+ first_call = 0;
+ }
+
/* look in the ".callbacks" var for a reference to this variable */
if (callback_list != NULL)
ret = env_attr_lookup(callback_list, var_name, callback_name);