/*
 * Copyright (C) 2012 ARM Ltd.
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * Adapted for ARM and earlycon:
 * Copyright (C) 2014 Linaro Ltd.
 * Author: Rob Herring <robh@kernel.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/serial_core.h>

#ifdef CONFIG_THUMB2_KERNEL
#define SEMIHOST_SWI	"0xab"
#else
#define SEMIHOST_SWI	"0x123456"
#endif

/*
 * Semihosting-based debug console
 */
static void smh_putc(struct uart_port *port, int c)
{
#ifdef CONFIG_ARM64
	asm volatile("mov  x1, %0\n"
		     "mov  x0, #3\n"
		     "hlt  0xf000\n"
		     : : "r" (&c) : "x0", "x1", "memory");
#else
	asm volatile("mov  r1, %0\n"
		     "mov  r0, #3\n"
		     "svc  " SEMIHOST_SWI "\n"
		     : : "r" (&c) : "r0", "r1", "memory");
#endif
}

static void smh_write(struct console *con, const char *s, unsigned n)
{
	struct earlycon_device *dev = con->data;
	uart_console_write(&dev->port, s, n, smh_putc);
}

static int
__init early_smh_setup(struct earlycon_device *device, const char *opt)
{
	device->con->write = smh_write;
	return 0;
}
EARLYCON_DECLARE(smh, early_smh_setup);
46652318e16'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/?id=2aff4534b6c48c465c2ba3bca310646652318e16'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/?id=2aff4534b6c48c465c2ba3bca310646652318e16'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/'>
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<tr><th>author</th><td>Miklos Szeredi &lt;mszeredi@redhat.com&gt;</td><td class='right'>2016-12-16 11:02:55 +0100</td></tr>
<tr><th>committer</th><td>Miklos Szeredi &lt;mszeredi@redhat.com&gt;</td><td class='right'>2016-12-16 11:02:55 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=2aff4534b6c48c465c2ba3bca310646652318e16'>2aff4534b6c48c465c2ba3bca310646652318e16</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=2aff4534b6c48c465c2ba3bca310646652318e16'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=2aff4534b6c48c465c2ba3bca310646652318e16'>c804f35f78e281b322375f0873558b4daca2b741</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=c412ce498396097cb96b3e24e062752312a962c9'>c412ce498396097cb96b3e24e062752312a962c9</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=2aff4534b6c48c465c2ba3bca310646652318e16&amp;id2=c412ce498396097cb96b3e24e062752312a962c9'>diff</a>)</td></tr></table>
<div class='commit-subject'>ovl: check lower existence when removing</div><div class='commit-msg'>Currently ovl_lookup() checks existence of lower file even if there's a
non-directory on upper (which is always opaque).  This is done so that
remove can decide whether a whiteout is needed or not.

It would be better to defer this check to unlink, since most of the time
the gathered information about opaqueness will be unused.

This adds a helper ovl_lower_positive() that checks if there's anything on
the lower layer(s).

The following patches also introduce changes to how the "opaque" attribute
is updated on directories: this attribute is added when the directory is
creted or moved over a whiteout or object covering something on the lower
layer.  However following changes will allow the attribute to remain on the
directory after being moved, even if the new location doesn't cover
anything.  Because of this, we need to check lower layers even for opaque
directories, so that whiteout is only created when necessary.

This function will later be also used to decide about marking a directory
opaque, so deal with negative dentries as well.  When dealing with
negative, it's enough to check for being a whiteout

If the dentry is positive but not upper then it also obviously needs
whiteout/opaque.

Signed-off-by: Miklos Szeredi &lt;mszeredi@redhat.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=2aff4534b6c48c465c2ba3bca310646652318e16'>Diffstat</a></div><table summary='diffstat' class='diffstat'>