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kdump: print a message in case parse_crashkernel_mem resulted in zero bytes

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parse_crashkernel_mem() silently returns if we get zero bytes in the
parsing function.  It is useful for debugging to add a message,
especially if the kernel cannot boot correctly.

Add a pr_info instead of pr_warn because it is expected behavior for
size = 0, eg.  crashkernel=2G-4G:128M, size will be 0 in case system
memory is less than 2G.

Link: http://lkml.kernel.org/r/20171114080129.GA6115@dhcp-128-65.nay.redhat.com
Signed-off-by: Dave Young <dyoung@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Bhupesh Sharma <bhsharma@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Young 2017-11-17 15:30:12 -08:00 committed by Linus Torvalds
parent 426915796c
commit de40ccefd1
1 changed files with 2 additions and 1 deletions
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3
kernel/crash_core.c
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@ -108,7 +108,8 @@ static int __init parse_crashkernel_mem(char *cmdline,
return -EINVAL;
}
}
}
} else
pr_info("crashkernel size resulted in zero bytes\n");
return 0;
}