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authorDavid S. Miller <davem@sunset.davemloft.net>2007-09-16 11:51:15 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-09-16 11:51:15 -0700
commit301feb652441a7168b59256fc44918075dcab0d5 (patch)
tree68721bebf1375659be165c4810bb439785d6e96f /arch/sparc64/prom
parent[SPARC64]: Update defconfig. (diff)
downloadlinux-dev-301feb652441a7168b59256fc44918075dcab0d5.tar.xz
linux-dev-301feb652441a7168b59256fc44918075dcab0d5.zip
[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>
Diffstat (limited to 'arch/sparc64/prom')
-rw-r--r--arch/sparc64/prom/misc.c16
1 files changed, 0 insertions, 16 deletions
diff --git a/arch/sparc64/prom/misc.c b/arch/sparc64/prom/misc.c
index 68c83ad04ad9..bbec7522826c 100644
--- a/arch/sparc64/prom/misc.c
+++ b/arch/sparc64/prom/misc.c
@@ -143,22 +143,6 @@ unsigned char prom_get_idprom(char *idbuf, int num_bytes)
return 0xff;
}
-/* Install Linux trap table so PROM uses that instead of its own. */
-void prom_set_trap_table(unsigned long tba)
-{
- p1275_cmd("SUNW,set-trap-table",
- (P1275_ARG(0, P1275_ARG_IN_64B) |
- P1275_INOUT(1, 0)), tba);
-}
-
-void prom_set_trap_table_sun4v(unsigned long tba, unsigned long mmfsa)
-{
- p1275_cmd("SUNW,set-trap-table",
- (P1275_ARG(0, P1275_ARG_IN_64B) |
- P1275_ARG(1, P1275_ARG_IN_64B) |
- P1275_INOUT(2, 0)), tba, mmfsa);
-}
-
int prom_get_mmu_ihandle(void)
{
int node, ret;