R0dn3yS/android_kernel_xiaomi_sm7250
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

of: Keep the phandle cache around after boot

Browse Source 
Phandle lookups still occur frequently after boot (like in the regulator
subsystem), and they can be quite expensive if the device tree is
complex. Lookups disable IRQs and have been observed to take over a
millisecond on a mobile arm64 device, which is very bad for system
latency.

Keep the phandle cache around after boot to retain O(1) lookup times.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
This commit is contained in:
Sultan Alsawaf 2021-10-21 00:41:45 -07:00 committed by spakkkk
parent 3f9503e8f6
commit bbe528de02
1 changed files with 0 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/of/base.c
View File

@ -145,22 +145,6 @@ static void __of_free_phandle_cache(void)
phandle_cache = NULL;
}
int of_free_phandle_cache(void)
{
unsigned long flags;
raw_spin_lock_irqsave(&devtree_lock, flags);
__of_free_phandle_cache();
raw_spin_unlock_irqrestore(&devtree_lock, flags);
return 0;
}
#if !defined(CONFIG_MODULES)
late_initcall_sync(of_free_phandle_cache);
#endif
/*
* Caller must hold devtree_lock.
*/