Skip to main content

Browse the archive

https://github.com/torvalds/linux
23 October 2021, 00:29:24 UTC
Revision 301feb652441a7168b59256fc44918075dcab0d5 authored by David S. Miller on 16 September 2007, 18:51:15 UTC, committed by David S. Miller on 16 September 2007, 18:51:15 UTC 
[SPARC64]: Fix lockdep, particularly on SMP.
 
As noted by Al Viro, when we try to call prom_set_trap_table()
in the SMP trampoline code we try to take the PROM call spinlock
which doesn't work because the current thread pointer isn't
valid yet and lockdep depends upon that being correct.

Furthermore, we cannot set the current thread pointer register
because it can't be properly dereferenced until we return from
prom_set_trap_table().  Kernel TLB misses only work after that
call.

So do the PROM call to set the trap table directly instead of
going through the OBP library C code, and thus avoid the lock
altogether.

These calls are guarenteed to be serialized fully.

Since there are now no calls to the prom_set_trap_table{_sun4v}()
library functions, they can be deleted.

Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 58ea1aa
History
Tip revision: 301feb652441a7168b59256fc44918075dcab0d5 authored by David S. Miller on 16 September 2007, 18:51:15 UTC
[SPARC64]: Fix lockdep, particularly on SMP.
Tip revision: 301feb6
File Mode Size
Documentation
arch
block
crypto
drivers
fs
include
init
ipc
kernel
lib
mm
net
scripts
security
sound
usr
.gitignore -rw-r--r-- 607 bytes
.mailmap -rw-r--r-- 3.6 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 89.3 KB
Kbuild -rw-r--r-- 1.5 KB
MAINTAINERS -rw-r--r-- 91.2 KB
Makefile -rw-r--r-- 50.1 KB
README -rw-r--r-- 16.5 KB
REPORTING-BUGS -rw-r--r-- 3.0 KB

README

back to top