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Remove the gawk dependency.

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This reverts commit 1814251453.

Demote the gawk call back to awk and ensure that stderr is attached.  GNU gawk
tolerates a missing stderr handle, but many utilities do not, which could be
why a regular awk call was unexplainably failing on some systems.

Use argv[0] instead of sh_path for consistency internally and with other Linux
drivers.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Darik Horn
2011-04-14 14:01:22 -05:00
committed by Brian Behlendorf
parent fa6f7d8f9d
commit ad35b6a6e9
3 changed files with 18 additions and 59 deletions
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module/spl/spl-generic.c
+15 -11
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@@ -414,21 +414,25 @@ EXPORT_SYMBOL(zone_get_hostid);
#ifndef HAVE_KALLSYMS_LOOKUP_NAME
/*
* Because kallsyms_lookup_name() is no longer exported in the
* mainline kernel we are forced to resort to somewhat drastic
* measures. This function replaces the functionality by performing
* an upcall to user space where /proc/kallsyms is consulted for
* the requested address.
* The kallsyms_lookup_name() kernel function is not an exported symbol in
* Linux 2.6.19 through 2.6.32 inclusive.
*
* This function replaces the functionality by performing an upcall to user
* space where /proc/kallsyms is consulted for the requested address.
*
*/
#define GET_KALLSYMS_ADDR_CMD \
"gawk '{ if ( $3 == \"kallsyms_lookup_name\") { print $1 } }' " \
"/proc/kallsyms >/proc/sys/kernel/spl/kallsyms_lookup_name"
#define GET_KALLSYMS_ADDR_CMD \
"exec 0</dev/null " \
" 1>/proc/sys/kernel/spl/kallsyms_lookup_name " \
" 2>/dev/null; " \
"awk '{ if ( $3 == \"kallsyms_lookup_name\" ) { print $1 } }' " \
" /proc/kallsyms "
static int
set_kallsyms_lookup_name(void)
{
char sh_path[] = "/bin/sh";
char *argv[] = { sh_path,
char *argv[] = { "/bin/sh",
"-c",
GET_KALLSYMS_ADDR_CMD,
NULL };
@@ -438,7 +442,7 @@ set_kallsyms_lookup_name(void)
NULL };
int rc;
rc = call_usermodehelper(sh_path, argv, envp, 1);
rc = call_usermodehelper(argv[0], argv, envp, 1);
if (rc)
printk("SPL: Failed user helper '%s %s %s', rc = %d\n",
argv[0], argv[1], argv[2], rc);