On Tue, 1 Nov 2016, Lu Baolu wrote:
> +static void early_xdbc_write(struct console *con, const char *str, u32 n)
> +{
> + int chunk, ret;
> + static char buf[XDBC_MAX_PACKET];
> + int use_cr = 0;
> +
> + if (!xdbc.xdbc_reg)
> + return;
> + memset(buf, 0, XDBC_MAX_PACKET);
How is that dealing with reentrancy?
early_printk() does not protect against it. Peter has a patch to prevent
concurrent access from different cpus, but it cannot and will never prevent
reentrancy on the same cpu (interrupt, nmi).
Thanks,
tglx
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