cpumask: fix CONFIG_CPUMASK_OFFSTACK=y cpu hotunplug crash

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Impact: Fix cpu offline when CONFIG_MAXSMP=y

Changeset bc9b83dd1f "cpumask: convert
c1e_mask in arch/x86/kernel/process.c to cpumask_var_t" contained a
bug: c1e_mask is manipulated even if C1E isn't detected (and hence
not allocated).

This is simply fixed by checking for NULL (which gcc optimizes out
anyway of CONFIG_CPUMASK_OFFSTACK=n, since it knows ce1_mask can never
be NULL).

In addition, fix a leak where select_idle_routine re-allocates
(and re-clears) c1e_mask on every cpu init.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Mike Travis <travis@sgi.com>
LKML-Reference: <200903171450.34549.rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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Rusty Russell 2009-03-17 14:50:34 +10:30 • committed by Ingo Molnar

parent 082edb7bf4

commit 30e1e6d1af

3 changed files with 13 additions and 3 deletions

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1

arch/x86/include/asm/processor.h

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1

arch/x86/kernel/cpu/common.c

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14

arch/x86/kernel/process.c

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