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sh: smp: shove a cpu_relax() in the plat_start_cpu() busy loop.

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Without this, certain versions of GCC will happily optimize the entire
loop out.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2008-08-06 18:39:32 +09:00
parent 8c24594dea
commit 71f0bdcab6
1 changed files with 1 additions and 1 deletions
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2
arch/sh/kernel/cpu/sh4a/smp-shx3.c
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@@ -82,7 +82,7 @@ void plat_start_cpu(unsigned int cpu, unsigned long entry_point)
ctrl_outl(STBCR_MSTP, STBCR_REG(cpu)); ctrl_outl(STBCR_MSTP, STBCR_REG(cpu));
while (!(ctrl_inl(STBCR_REG(cpu)) & STBCR_MSTP)) while (!(ctrl_inl(STBCR_REG(cpu)) & STBCR_MSTP))
; cpu_relax();
/* Start up secondary processor by sending a reset */ /* Start up secondary processor by sending a reset */
ctrl_outl(STBCR_AP_VAL, STBCR_REG(cpu)); ctrl_outl(STBCR_AP_VAL, STBCR_REG(cpu));