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console: limit the range of VGACON_SOFT_SCROLLBACK_SIZE
BuraphaLinux reported that we will trigger a mm warning when we CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=65536, this is because mm cann't allocate so many pages. We should limit the range of CONFIG_VGACON_SOFT_SCROLLBACK_SIZE, don't give a user any chance to trigger that. Reported-by: BuraphaLinux Server <buraphalinuxserver@gmail.com> Tested-by: BuraphaLinux Server <buraphalinuxserver@gmail.com> Signed-off-by: WANG Cong <amwang@redhat.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -37,6 +37,7 @@ config VGACON_SOFT_SCROLLBACK
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config VGACON_SOFT_SCROLLBACK_SIZE
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int "Scrollback Buffer Size (in KB)"
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depends on VGACON_SOFT_SCROLLBACK
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range 1 1024
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default "64"
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help
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Enter the amount of System RAM to allocate for the scrollback
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