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| author | David S. Miller <davem@davemloft.net> | 2006-02-01 03:34:51 +0100 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 10:11:29 +0100 |
| commit | 86b818687d4894063ecd1190e54717a0cce8c009 (patch) | |
| tree | d2951295358502c88f7fe0c02517d729cff4eb9a /arch/sparc64/kernel/winfixup.S | |
| parent | [SPARC64]: Kill swapper_pgd_zero, totally unused. (diff) | |
| download | linux-86b818687d4894063ecd1190e54717a0cce8c009.tar.xz linux-86b818687d4894063ecd1190e54717a0cce8c009.zip | |
[SPARC64]: Fix race in LOAD_PER_CPU_BASE()
Since we use %g5 itself as a temporary, it can get clobbered
if we take an interrupt mid-stream and thus cause end up with
the final %g5 value too early as a result of rtrap processing.
Set %g5 at the very end, atomically, to avoid this problem.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/winfixup.S')
| -rw-r--r-- | arch/sparc64/kernel/winfixup.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/sparc64/kernel/winfixup.S b/arch/sparc64/kernel/winfixup.S index c0545d089c96..ade991b7d079 100644 --- a/arch/sparc64/kernel/winfixup.S +++ b/arch/sparc64/kernel/winfixup.S @@ -86,7 +86,7 @@ fill_fixup: wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate mov %o7, %g6 ldx [%g6 + TI_TASK], %g4 - LOAD_PER_CPU_BASE(%g1, %g2) + LOAD_PER_CPU_BASE(%g1, %g2, %g3) /* This is the same as below, except we handle this a bit special * since we must preserve %l5 and %l6, see comment above. @@ -209,7 +209,7 @@ fill_fixup_mna: wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate mov %o7, %g6 ! Get current back. ldx [%g6 + TI_TASK], %g4 ! Finish it. - LOAD_PER_CPU_BASE(%g1, %g2) + LOAD_PER_CPU_BASE(%g1, %g2, %g3) call mem_address_unaligned add %sp, PTREGS_OFF, %o0 @@ -312,7 +312,7 @@ fill_fixup_dax: wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate mov %o7, %g6 ! Get current back. ldx [%g6 + TI_TASK], %g4 ! Finish it. - LOAD_PER_CPU_BASE(%g1, %g2) + LOAD_PER_CPU_BASE(%g1, %g2, %g3) call spitfire_data_access_exception add %sp, PTREGS_OFF, %o0 |