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| author | Ralf Baechle <ralf@linux-mips.org> | 2009-10-13 23:23:28 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-11-02 12:00:07 +0100 |
| commit | c2ea1d56eaf084c66177eb5658ff4065e79b36ea (patch) | |
| tree | fcc0a634a194dba00f730b54bdf6cf5f0f3b9de1 /arch/mips/kernel/head.S | |
| parent | cd847b7857b835f9730d6fc93c3f423fcacc50f7 (diff) | |
| download | lwn-c2ea1d56eaf084c66177eb5658ff4065e79b36ea.tar.gz lwn-c2ea1d56eaf084c66177eb5658ff4065e79b36ea.zip | |
MIPS: Avoid potential hazard on Context register
set_saved_sp reads Context register. Avoid reading stale value from
earlier incomplete write.
Issue found and fixed for head.S by Chris Dearman <chris@mips.com>.
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/head.S')
| -rw-r--r-- | arch/mips/kernel/head.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S index 531ce7b16124..ea695d9605e9 100644 --- a/arch/mips/kernel/head.S +++ b/arch/mips/kernel/head.S @@ -191,6 +191,7 @@ NESTED(kernel_entry, 16, sp) # kernel entry point /* Set the SP after an empty pt_regs. */ PTR_LI sp, _THREAD_SIZE - 32 - PT_SIZE PTR_ADDU sp, $28 + back_to_back_c0_hazard set_saved_sp sp, t0, t1 PTR_SUBU sp, 4 * SZREG # init stack pointer |