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s390/sysinfo,stsi: change return code handling

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Change return code handling of the stsi() function:

In case function code 0 was specified the return value is the
current configuration level (already shifted). That way all
the code that actually copied the stsi_0() function can go
away.

Otherwise the return value is 0 (success) or negative to
indicate an error (currently only -EOPNOTSUPP).

Also stsi() is no longer an inline function. The function is
not performance critical, but every caller would generate an
exception table entry for this function.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2012-09-06 14:42:13 +02:00
committed by Martin Schwidefsky
orang tua 94f2b9e25d
melakukan caf757c609
6 mengubah file dengan 51 tambahan dan 60 penghapusan
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41
arch/s390/kernel/sysinfo.c
Melihat File

@@ -24,18 +24,38 @@
int topology_max_mnest;
static inline int stsi_0(void)
/*
* stsi - store system information
*
* Returns the current configuration level if function code 0 was specified.
* Otherwise returns 0 on success or a negative value on error.
*/
int stsi(void *sysinfo, int fc, int sel1, int sel2)
{
int rc = stsi(NULL, 0, 0, 0);
register int r0 asm("0") = (fc << 28) | sel1;
register int r1 asm("1") = sel2;
int rc = 0;
return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
asm volatile(
" stsi 0(%3)\n"
"0: jz 2f\n"
"1: lhi %1,%4\n"
"2:\n"
EX_TABLE(0b, 1b)
: "+d" (r0), "+d" (rc)
: "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)
: "cc", "memory");
if (rc)
return rc;
return fc ? 0 : ((unsigned int) r0) >> 28;
}
EXPORT_SYMBOL(stsi);
static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
{
int i;
if (stsi(info, 1, 1, 1) == -ENOSYS)
if (stsi(info, 1, 1, 1))
return;
EBCASC(info->manufacturer, sizeof(info->manufacturer));
EBCASC(info->type, sizeof(info->type));
@@ -97,7 +117,8 @@ static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
seq_putc(m, '\n');
if (!MACHINE_HAS_TOPOLOGY)
return;
stsi(info, 15, 1, topology_max_mnest);
if (stsi(info, 15, 1, topology_max_mnest))
return;
seq_printf(m, "CPU Topology HW: ");
for (i = 0; i < TOPOLOGY_NR_MAG; i++)
seq_printf(m, " %d", info->mag[i]);
@@ -116,7 +137,7 @@ static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
struct sysinfo_1_2_2_extension *ext;
int i;
if (stsi(info, 1, 2, 2) == -ENOSYS)
if (stsi(info, 1, 2, 2))
return;
ext = (struct sysinfo_1_2_2_extension *)
((unsigned long) info + info->acc_offset);
@@ -152,7 +173,7 @@ static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
{
if (stsi(info, 2, 2, 2) == -ENOSYS)
if (stsi(info, 2, 2, 2))
return;
EBCASC(info->name, sizeof(info->name));
seq_putc(m, '\n');
@@ -179,7 +200,7 @@ static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
{
int i;
if (stsi(info, 3, 2, 2) == -ENOSYS)
if (stsi(info, 3, 2, 2))
return;
for (i = 0; i < info->count; i++) {
EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
@@ -202,7 +223,7 @@ static int sysinfo_show(struct seq_file *m, void *v)
if (!info)
return 0;
level = stsi_0();
level = stsi(NULL, 0, 0, 0);
if (level >= 1)
stsi_1_1_1(m, info);
if (level >= 1)
@@ -365,7 +386,7 @@ void s390_adjust_jiffies(void)
if (!info)
return;
if (stsi(info, 1, 2, 2) != -ENOSYS) {
if (stsi(info, 1, 2, 2) == 0) {
/*
* Major sigh. The cpu capability encoding is "special".
* If the first 9 bits of info->capability are 0 then it