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| 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 /arch | |
| parent | 8a3360f06cd4d3b1d57f73e029f2f8b6057fdcba (diff) | |
| download | op-kernel-dev-f13ae30e1397e3bfb38feb3b6e889af5d021f13d.zip op-kernel-dev-f13ae30e1397e3bfb38feb3b6e889af5d021f13d.tar.gz | |
[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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/ia64/kernel/sal.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/ia64/kernel/sal.c b/arch/ia64/kernel/sal.c index a3022dc..7e02597 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); |
