diff options
| author | Alex Chiang <achiang@hp.com> | 2008-05-08 14:03:23 -0600 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2008-05-14 15:42:07 -0700 |
| commit | f13ae30e1397e3bfb38feb3b6e889af5d021f13d (patch) | |
| tree | 4b82d1ee1e8bbb5f21d5f81bb0a73cf3daa8efb4 | |
| parent | 8a3360f06cd4d3b1d57f73e029f2f8b6057fdcba (diff) | |
[IA64] allow user to force_pal_cache_flush
The sequence executed in check_sal_cache_flush:
- pend a timer interrupt
- call SAL_CACHE_FLUSH
- see if interrupt is still pending
can hang HP machines with buggy SAL_CACHE_FLUSH implementations.
Provide a kernel command-line argument to allow users skip this
check if desired. Using this parameter will force ia64_sal_cache_flush
to call ia64_pal_cache_flush() instead of SAL_CACHE_FLUSH.
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 6 | ||||
| -rw-r--r-- | arch/ia64/kernel/sal.c | 11 |
2 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index cdd5b934f43..654d630f675 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -689,6 +689,12 @@ and is between 256 and 4096 characters. It is defined in the file floppy= [HW] See Documentation/floppy.txt. + force_pal_cache_flush + [IA-64] Avoid check_sal_cache_flush which may hang on + buggy SAL_CACHE_FLUSH implementations. Using this + parameter will force ia64_sal_cache_flush to call + ia64_pal_cache_flush instead of SAL_CACHE_FLUSH. + gamecon.map[2|3]= [HW,JOY] Multisystem joystick and NES/SNES/PSX pad support via parallel port (up to 5 devices per port) diff --git a/arch/ia64/kernel/sal.c b/arch/ia64/kernel/sal.c index a3022dc48ef..7e0259709c0 100644 --- a/arch/ia64/kernel/sal.c +++ b/arch/ia64/kernel/sal.c @@ -229,6 +229,14 @@ static void __init sal_desc_ap_wakeup(void *p) { } */ static int sal_cache_flush_drops_interrupts; +static int __init +force_pal_cache_flush(char *str) +{ + sal_cache_flush_drops_interrupts = 1; + return 0; +} +early_param("force_pal_cache_flush", force_pal_cache_flush); + void __init check_sal_cache_flush (void) { @@ -237,6 +245,9 @@ check_sal_cache_flush (void) u64 vector, cache_type = 3; struct ia64_sal_retval isrv; + if (sal_cache_flush_drops_interrupts) + return; + cpu = get_cpu(); local_irq_save(flags); |