Re: __kernel_suseconds_t is int on PA-RISC (and SPARC64)?

From: Helge Deller
Date: Thu Sep 04 2008 - 17:03:29 EST


Geert Uytterhoeven wrote:
On Tue, 26 Aug 2008, Helge Deller wrote:
Geert Uytterhoeven wrote:
Apparently __kernel_suseconds_t is `int' on PA-RISC (and on SPARC64),
while it's `long' on all other platforms.

Is there a specific reason for that?
I don't know for sure, but arch/parisc/kernel/syscall_table.S states:
/* even though manpage says struct timeval contains longs, ours has
* time_t and suseconds_t -- both of which are safe wide/narrow */
ENTRY_COMP(setitimer)

So it was probably chosen to be int so that it can be easily used in 32- and
64bit kernels (or compat code).

This causes compiler warnings in the HP SDC Real Time Clock driver,
which is shared between PA-RISC and m68k:

Here's a patch to fix the compiler warnings. Is this OK for PA-RISC?

SUbject: [PATCH] HP input: kill warnings due to suseconds_t differences

Kill compiler warnings related to printf() formats in the input drivers for
various HP9000 machines, which are shared between PA-RISC (suseconds_t is int)
and m68k (suseconds_t is long). As both are 32-bit, it's safe to cast to int.

Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Thanks Geert.
Tested and OK for PA-RISC.

Acked-by: Helge Deller <deller@xxxxxx>


---
drivers/input/misc/hp_sdc_rtc.c | 10 +++++-----
drivers/input/serio/hp_sdc.c | 2 +-
2 files changed, 6 insertions(+), 6 deletions(-)

--- a/drivers/input/misc/hp_sdc_rtc.c
+++ b/drivers/input/misc/hp_sdc_rtc.c
@@ -458,35 +458,35 @@ static int hp_sdc_rtc_proc_output (char p += sprintf(p, "i8042 rtc\t: READ FAILED!\n");
} else {
p += sprintf(p, "i8042 rtc\t: %ld.%02d seconds\n", - tv.tv_sec, tv.tv_usec/1000);
+ tv.tv_sec, (int)tv.tv_usec/1000);
}
if (hp_sdc_rtc_read_fhs(&tv)) {
p += sprintf(p, "handshake\t: READ FAILED!\n");
} else {
p += sprintf(p, "handshake\t: %ld.%02d seconds\n", - tv.tv_sec, tv.tv_usec/1000);
+ tv.tv_sec, (int)tv.tv_usec/1000);
}
if (hp_sdc_rtc_read_mt(&tv)) {
p += sprintf(p, "alarm\t\t: READ FAILED!\n");
} else {
p += sprintf(p, "alarm\t\t: %ld.%02d seconds\n", - tv.tv_sec, tv.tv_usec/1000);
+ tv.tv_sec, (int)tv.tv_usec/1000);
}
if (hp_sdc_rtc_read_dt(&tv)) {
p += sprintf(p, "delay\t\t: READ FAILED!\n");
} else {
p += sprintf(p, "delay\t\t: %ld.%02d seconds\n", - tv.tv_sec, tv.tv_usec/1000);
+ tv.tv_sec, (int)tv.tv_usec/1000);
}
if (hp_sdc_rtc_read_ct(&tv)) {
p += sprintf(p, "periodic\t: READ FAILED!\n");
} else {
p += sprintf(p, "periodic\t: %ld.%02d seconds\n", - tv.tv_sec, tv.tv_usec/1000);
+ tv.tv_sec, (int)tv.tv_usec/1000);
}
p += sprintf(p,
--- a/drivers/input/serio/hp_sdc.c
+++ b/drivers/input/serio/hp_sdc.c
@@ -323,7 +323,7 @@ static void hp_sdc_tasklet(unsigned long
* it back to the application. and be less verbose.
*/
printk(KERN_WARNING PREFIX "read timeout (%ius)!\n",
- tv.tv_usec - hp_sdc.rtv.tv_usec);
+ (int)(tv.tv_usec - hp_sdc.rtv.tv_usec));
curr->idx += hp_sdc.rqty;
hp_sdc.rqty = 0;
tmp = curr->seq[curr->actidx];

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds


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