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powerpc: Ensure that ppc_md is empty before probing for machine type

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Anything in there will be overwritten, so it helps catching nasty
bugs if we check that it's indeed full of NULL's before we do so.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2016-07-05 15:03:59 +10:00 committed by Michael Ellerman
parent 7025776ed1
commit 84b62c72fa
1 changed files with 12 additions and 0 deletions
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12
arch/powerpc/kernel/setup-common.c
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@ -575,6 +575,7 @@ void probe_machine(void)
{
extern struct machdep_calls __machine_desc_start;
extern struct machdep_calls __machine_desc_end;
unsigned int i;
/*
* Iterate all ppc_md structures until we find the proper
@ -582,6 +583,17 @@ void probe_machine(void)
*/
DBG("Probing machine type ...\n");
/*
* Check ppc_md is empty, if not we have a bug, ie, we setup an
* entry before probe_machine() which will be overwritten
*/
for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
if (((void **)&ppc_md)[i]) {
printk(KERN_ERR "Entry %d in ppc_md non empty before"
" machine probe !\n", i);
}
}
for (machine_id = &__machine_desc_start;
machine_id < &__machine_desc_end;
machine_id++) {