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authorDavid S. Miller <davem@davemloft.net>2012-05-10 11:00:46 -0700
committerDavid S. Miller <davem@davemloft.net>2012-05-10 11:00:46 -0700
commita5a737e090e25981e99d69f01400e3a80356581c (patch)
tree800716c007575b1c316299300e3316d0d94ed243 /arch/sparc/mm
parentbc46f9375a286d05f84a9464efc2b7f1f5614ff4 (diff)
downloadlinux-a5a737e090e25981e99d69f01400e3a80356581c.tar.gz
sparc64: Do not clobber %g2 in xcall_fetch_glob_regs().
%g2 is meant to hold the CPUID number throughout this routine, since at the very beginning, and at the very end, we use %g2 to calculate indexes into per-cpu arrays. However we erroneously clobber it in order to hold the %cwp register value mid-stream. Fix this code to use %g3 for the %cwp read and related calulcations instead. Reported-by: Meelis Roos <mroos@linux.ee> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm')
-rw-r--r--arch/sparc/mm/ultra.S6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S
index b57a5942ba6..874162a11ce 100644
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -495,11 +495,11 @@ xcall_fetch_glob_regs:
stx %o7, [%g1 + GR_SNAP_O7]
stx %i7, [%g1 + GR_SNAP_I7]
/* Don't try this at home kids... */
- rdpr %cwp, %g2
- sub %g2, 1, %g7
+ rdpr %cwp, %g3
+ sub %g3, 1, %g7
wrpr %g7, %cwp
mov %i7, %g7
- wrpr %g2, %cwp
+ wrpr %g3, %cwp
stx %g7, [%g1 + GR_SNAP_RPC]
sethi %hi(trap_block), %g7
or %g7, %lo(trap_block), %g7