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powerpc/powernv: Skip registering log region when CONFIG_PRINTK=n 

When CONFIG_PRINTK=n, log_buf_addr_get() returns NULL and log_buf_len_get()
return 0. Check for these return values and skip registering the dump buffer.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Pranith Kumar 2015-01-21 21:26:09 -05:00 committed by Michael Ellerman
parent 3df76a9dcc
commit 6501ab5e38
1 changed files with 6 additions and 0 deletions
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6
arch/powerpc/platforms/powernv/opal.c
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@ -667,7 +667,13 @@ static void __init opal_dump_region_init(void)
/* Register kernel log buffer */ /* Register kernel log buffer */
addr = log_buf_addr_get(); addr = log_buf_addr_get();
if (addr == NULL)
return;
size = log_buf_len_get(); size = log_buf_len_get();
if (size == 0)
return;
rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
__pa(addr), size); __pa(addr), size);
/* Don't warn if this is just an older OPAL that doesn't /* Don't warn if this is just an older OPAL that doesn't