| Message ID | 1421797911-23650-2-git-send-email-bobby.prani@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 6501ab5e380cf25dad85705856bfdde439dbcbd2 |
| Headers | show |
Pranith Kumar <bobby.prani@gmail.com> writes: > 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> > CC: Michael Ellerman <mpe@ellerman.id.au> (investigating what would occur on systems with current firmware..) Looking at hw/fsp/fsp-mdst-table.c in skiboot it appears that we'd end up logging an error log about being passed the size 0 and return OPAL_PARAMETER back to Linux. While harmless, this is, naturally, not awesome to log an error about being unable to grab kernel log on crash every time you boot. Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com> > --- > arch/powerpc/platforms/powernv/opal.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c > index f10b9ec..1db119f0 100644 > --- a/arch/powerpc/platforms/powernv/opal.c > +++ b/arch/powerpc/platforms/powernv/opal.c > @@ -667,7 +667,13 @@ static void __init opal_dump_region_init(void) > > /* Register kernel log buffer */ > addr = log_buf_addr_get(); > + if (addr == NULL) > + return; > + > size = log_buf_len_get(); > + if (size == 0) > + return; > + > rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, > __pa(addr), size); > /* Don't warn if this is just an older OPAL that doesn't > -- > 1.9.1 > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index f10b9ec..1db119f0 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -667,7 +667,13 @@ static void __init opal_dump_region_init(void) /* Register kernel log buffer */ addr = log_buf_addr_get(); + if (addr == NULL) + return; + size = log_buf_len_get(); + if (size == 0) + return; + rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, __pa(addr), size); /* Don't warn if this is just an older OPAL that doesn't
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> CC: Michael Ellerman <mpe@ellerman.id.au> --- arch/powerpc/platforms/powernv/opal.c | 6 ++++++ 1 file changed, 6 insertions(+)