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| author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2008-08-06 10:27:30 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-06 20:48:02 +0200 |
| commit | d04ec773d7ca1bbc05a2768be95c1cebe2b07757 (patch) | |
| tree | 7f44aad93d8f8a526f5a16f42feab080b3ecb9da /arch/x86 | |
| parent | e4a6be4d2850da032a782b5296c07dfdf583af86 (diff) | |
| download | linux-d04ec773d7ca1bbc05a2768be95c1cebe2b07757.tar.gz linux-d04ec773d7ca1bbc05a2768be95c1cebe2b07757.tar.bz2 linux-d04ec773d7ca1bbc05a2768be95c1cebe2b07757.zip | |
x86: pda_init(): fix memory leak when using CPU hotplug
pda->irqstackptr is allocated whenever a CPU is set online.
But it is never freed. This results in a memory leak of 16K
for each CPU offline/online cycle.
Fix is to allocate pda->irqstackptr only once.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: akpm@linux-foundation.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/common_64.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/x86/kernel/cpu/common_64.c b/arch/x86/kernel/cpu/common_64.c index c3afba5a81a7..4f2eeb5652ea 100644 --- a/arch/x86/kernel/cpu/common_64.c +++ b/arch/x86/kernel/cpu/common_64.c @@ -529,17 +529,20 @@ void pda_init(int cpu) /* others are initialized in smpboot.c */ pda->pcurrent = &init_task; pda->irqstackptr = boot_cpu_stack; + pda->irqstackptr += IRQSTACKSIZE - 64; } else { - pda->irqstackptr = (char *) - __get_free_pages(GFP_ATOMIC, IRQSTACK_ORDER); - if (!pda->irqstackptr) - panic("cannot allocate irqstack for cpu %d", cpu); + if (!pda->irqstackptr) { + pda->irqstackptr = (char *) + __get_free_pages(GFP_ATOMIC, IRQSTACK_ORDER); + if (!pda->irqstackptr) + panic("cannot allocate irqstack for cpu %d", + cpu); + pda->irqstackptr += IRQSTACKSIZE - 64; + } if (pda->nodenumber == 0 && cpu_to_node(cpu) != NUMA_NO_NODE) pda->nodenumber = cpu_to_node(cpu); } - - pda->irqstackptr += IRQSTACKSIZE-64; } char boot_exception_stacks[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + |