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tty/serial: Migrate dz to use has_sysrq

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The SUPPORT_SYSRQ ifdeffery is not nice as:
- May create misunderstanding about sizeof(struct uart_port) between
  different objects
- Prevents moving functions from serial_core.h
- Reduces readability (well, it's ifdeffery - it's hard to follow)

In order to remove SUPPORT_SYSRQ, has_sysrq variable has been added.
Initialise it in driver's probe and remove ifdeffery.

Cc: "Maciej W. Rozycki" <macro@linux-mips.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20191213000657.931618-16-dima@arista.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Safonov 2019-12-13 00:06:14 +00:00 committed by Greg Kroah-Hartman
parent 410090d2f4
commit 881bdb443b
1 changed files with 1 additions and 4 deletions
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5
drivers/tty/serial/dz.c
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@ -29,10 +29,6 @@
#undef DEBUG_DZ #undef DEBUG_DZ
#if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/bitops.h> #include <linux/bitops.h>
#include <linux/compiler.h> #include <linux/compiler.h>
#include <linux/console.h> #include <linux/console.h>
@ -787,6 +783,7 @@ static void __init dz_init_ports(void)
uport->ops = &dz_ops; uport->ops = &dz_ops;
uport->line = line; uport->line = line;
uport->mapbase = base; uport->mapbase = base;
uport->has_sysrq = IS_ENABLED(CONFIG_SERIAL_DZ_CONSOLE);
} }
} }