arch: Remove Itanium (IA-64) architecture

The Itanium architecture is obsolete, and an informal survey [0] reveals
that any residual use of Itanium hardware in production is mostly HP-UX
or OpenVMS based. The use of Linux on Itanium appears to be limited to
enthusiasts that occasionally boot a fresh Linux kernel to see whether
things are still working as intended, and perhaps to churn out some
distro packages that are rarely used in practice.

None of the original companies behind Itanium still produce or support
any hardware or software for the architecture, and it is listed as
'Orphaned' in the MAINTAINERS file, as apparently, none of the engineers
that contributed on behalf of those companies (nor anyone else, for that
matter) have been willing to support or maintain the architecture
upstream or even be responsible for applying the odd fix. The Intel
firmware team removed all IA-64 support from the Tianocore/EDK2
reference implementation of EFI in 2018. (Itanium is the original
architecture for which EFI was developed, and the way Linux supports it
deviates significantly from other architectures.) Some distros, such as
Debian and Gentoo, still maintain [unofficial] ia64 ports, but many have
dropped support years ago.

While the argument is being made [1] that there is a 'for the common
good' angle to being able to build and run existing projects such as the
Grid Community Toolkit [2] on Itanium for interoperability testing, the
fact remains that none of those projects are known to be deployed on
Linux/ia64, and very few people actually have access to such a system in
the first place. Even if there were ways imaginable in which Linux/ia64
could be put to good use today, what matters is whether anyone is
actually doing that, and this does not appear to be the case.

There are no emulators widely available, and so boot testing Itanium is
generally infeasible for ordinary contributors. GCC still supports IA-64
but its compile farm [3] no longer has any IA-64 machines. GLIBC would
like to get rid of IA-64 [4] too because it would permit some overdue
code cleanups. In summary, the benefits to the ecosystem of having IA-64
be part of it are mostly theoretical, whereas the maintenance overhead
of keeping it supported is real.

So let's rip off the band aid, and remove the IA-64 arch code entirely.
This follows the timeline proposed by the Debian/ia64 maintainer [5],
which removes support in a controlled manner, leaving IA-64 in a known
good state in the most recent LTS release. Other projects will follow
once the kernel support is removed.

[0] https://lore.kernel.org/all/CAMj1kXFCMh_578jniKpUtx_j8ByHnt=s7S+yQ+vGbKt9ud7+kQ@mail.gmail.com/
[1] https://lore.kernel.org/all/0075883c-7c51-00f5-2c2d-5119c1820410@web.de/
[2] https://gridcf.org/gct-docs/latest/index.html
[3] https://cfarm.tetaneutral.net/machines/list/
[4] https://lore.kernel.org/all/87bkiilpc4.fsf@mid.deneb.enyo.de/
[5] https://lore.kernel.org/all/ff58a3e76e5102c94bb5946d99187b358def688a.camel@physik.fu-berlin.de/

Acked-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

1 files changed, 0 insertions, 646 deletions

diff --git a/arch/ia64/kernel/salinfo.c b/arch/ia64/kernel/salinfo.c
deleted file mode 100644
index 03b632c56899..000000000000
--- a/arch/ia64/kernel/salinfo.c
+++ /dev/null
@@ -1,646 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * salinfo.c
- *
- * Creates entries in /proc/sal for various system features.
- *
- * Copyright (c) 2003, 2006 Silicon Graphics, Inc.  All rights reserved.
- * Copyright (c) 2003 Hewlett-Packard Co
- *	Bjorn Helgaas <bjorn.helgaas@hp.com>
- *
- * 10/30/2001	jbarnes@sgi.com		copied much of Stephane's palinfo
- *					code to create this file
- * Oct 23 2003	kaos@sgi.com
- *   Replace IPI with set_cpus_allowed() to read a record from the required cpu.
- *   Redesign salinfo log processing to separate interrupt and user space
- *   contexts.
- *   Cache the record across multi-block reads from user space.
- *   Support > 64 cpus.
- *   Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module.
- *
- * Jan 28 2004	kaos@sgi.com
- *   Periodically check for outstanding MCA or INIT records.
- *
- * Dec  5 2004	kaos@sgi.com
- *   Standardize which records are cleared automatically.
- *
- * Aug 18 2005	kaos@sgi.com
- *   mca.c may not pass a buffer, a NULL buffer just indicates that a new
- *   record is available in SAL.
- *   Replace some NR_CPUS by cpus_online, for hotplug cpu.
- *
- * Jan  5 2006        kaos@sgi.com
- *   Handle hotplug cpus coming online.
- *   Handle hotplug cpus going offline while they still have outstanding records.
- *   Use the cpu_* macros consistently.
- *   Replace the counting semaphore with a mutex and a test if the cpumask is non-empty.
- *   Modify the locking to make the test for "work to do" an atomic operation.
- */
-
-#include <linux/capability.h>
-#include <linux/cpu.h>
-#include <linux/types.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/module.h>
-#include <linux/smp.h>
-#include <linux/timer.h>
-#include <linux/vmalloc.h>
-#include <linux/semaphore.h>
-
-#include <asm/sal.h>
-#include <linux/uaccess.h>
-
-MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
-MODULE_DESCRIPTION("/proc interface to IA-64 SAL features");
-MODULE_LICENSE("GPL");
-
-typedef struct {
-	const char		*name;		/* name of the proc entry */
-	unsigned long           feature;        /* feature bit */
-	struct proc_dir_entry	*entry;		/* registered entry (removal) */
-} salinfo_entry_t;
-
-/*
- * List {name,feature} pairs for every entry in /proc/sal/<feature>
- * that this module exports
- */
-static const salinfo_entry_t salinfo_entries[]={
-	{ "bus_lock",           IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, },
-	{ "irq_redirection",	IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, },
-	{ "ipi_redirection",	IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, },
-	{ "itc_drift",		IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, },
-};
-
-#define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries)
-
-static char *salinfo_log_name[] = {
-	"mca",
-	"init",
-	"cmc",
-	"cpe",
-};
-
-static struct proc_dir_entry *salinfo_proc_entries[
-	ARRAY_SIZE(salinfo_entries) +			/* /proc/sal/bus_lock */
-	ARRAY_SIZE(salinfo_log_name) +			/* /proc/sal/{mca,...} */
-	(2 * ARRAY_SIZE(salinfo_log_name)) +		/* /proc/sal/mca/{event,data} */
-	1];						/* /proc/sal */
-
-/* Some records we get ourselves, some are accessed as saved data in buffers
- * that are owned by mca.c.
- */
-struct salinfo_data_saved {
-	u8*			buffer;
-	u64			size;
-	u64			id;
-	int			cpu;
-};
-
-/* State transitions.  Actions are :-
- *   Write "read <cpunum>" to the data file.
- *   Write "clear <cpunum>" to the data file.
- *   Write "oemdata <cpunum> <offset> to the data file.
- *   Read from the data file.
- *   Close the data file.
- *
- * Start state is NO_DATA.
- *
- * NO_DATA
- *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "oemdata <cpunum> <offset> -> return -EINVAL.
- *    read data -> return EOF.
- *    close -> unchanged.  Free record areas.
- *
- * LOG_RECORD
- *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
- *    read data -> return the INIT/MCA/CMC/CPE record.
- *    close -> unchanged.  Keep record areas.
- *
- * OEMDATA
- *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
- *    read data -> return the formatted oemdata.
- *    close -> unchanged.  Keep record areas.
- *
- * Closing the data file does not change the state.  This allows shell scripts
- * to manipulate salinfo data, each shell redirection opens the file, does one
- * action then closes it again.  The record areas are only freed at close when
- * the state is NO_DATA.
- */
-enum salinfo_state {
-	STATE_NO_DATA,
-	STATE_LOG_RECORD,
-	STATE_OEMDATA,
-};
-
-struct salinfo_data {
-	cpumask_t		cpu_event;	/* which cpus have outstanding events */
-	wait_queue_head_t	read_wait;
-	u8			*log_buffer;
-	u64			log_size;
-	u8			*oemdata;	/* decoded oem data */
-	u64			oemdata_size;
-	int			open;		/* single-open to prevent races */
-	u8			type;
-	u8			saved_num;	/* using a saved record? */
-	enum salinfo_state	state :8;	/* processing state */
-	u8			padding;
-	int			cpu_check;	/* next CPU to check */
-	struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */
-};
-
-static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)];
-
-static DEFINE_SPINLOCK(data_lock);
-static DEFINE_SPINLOCK(data_saved_lock);
-
-/** salinfo_platform_oemdata - optional callback to decode oemdata from an error
- * record.
- * @sect_header: pointer to the start of the section to decode.
- * @oemdata: returns vmalloc area containing the decoded output.
- * @oemdata_size: returns length of decoded output (strlen).
- *
- * Description: If user space asks for oem data to be decoded by the kernel
- * and/or prom and the platform has set salinfo_platform_oemdata to the address
- * of a platform specific routine then call that routine.  salinfo_platform_oemdata
- * vmalloc's and formats its output area, returning the address of the text
- * and its strlen.  Returns 0 for success, -ve for error.  The callback is
- * invoked on the cpu that generated the error record.
- */
-int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size);
-
-struct salinfo_platform_oemdata_parms {
-	const u8 *efi_guid;
-	u8 **oemdata;
-	u64 *oemdata_size;
-};
-
-static long
-salinfo_platform_oemdata_cpu(void *context)
-{
-	struct salinfo_platform_oemdata_parms *parms = context;
-
-	return salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
-}
-
-static void
-shift1_data_saved (struct salinfo_data *data, int shift)
-{
-	memcpy(data->data_saved+shift, data->data_saved+shift+1,
-	       (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0]));
-	memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0,
-	       sizeof(data->data_saved[0]));
-}
-
-/* This routine is invoked in interrupt context.  Note: mca.c enables
- * interrupts before calling this code for CMC/CPE.  MCA and INIT events are
- * not irq safe, do not call any routines that use spinlocks, they may deadlock.
- * MCA and INIT records are recorded, a timer event will look for any
- * outstanding events and wake up the user space code.
- *
- * The buffer passed from mca.c points to the output from ia64_log_get. This is
- * a persistent buffer but its contents can change between the interrupt and
- * when user space processes the record.  Save the record id to identify
- * changes.  If the buffer is NULL then just update the bitmap.
- */
-void
-salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
-{
-	struct salinfo_data *data = salinfo_data + type;
-	struct salinfo_data_saved *data_saved;
-	unsigned long flags = 0;
-	int i;
-	int saved_size = ARRAY_SIZE(data->data_saved);
-
-	BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
-
-	if (irqsafe)
-		spin_lock_irqsave(&data_saved_lock, flags);
-	if (buffer) {
-		for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
-			if (!data_saved->buffer)
-				break;
-		}
-		if (i == saved_size) {
-			if (!data->saved_num) {
-				shift1_data_saved(data, 0);
-				data_saved = data->data_saved + saved_size - 1;
-			} else
-				data_saved = NULL;
-		}
-		if (data_saved) {
-			data_saved->cpu = smp_processor_id();
-			data_saved->id = ((sal_log_record_header_t *)buffer)->id;
-			data_saved->size = size;
-			data_saved->buffer = buffer;
-		}
-	}
-	cpumask_set_cpu(smp_processor_id(), &data->cpu_event);
-	if (irqsafe) {
-		wake_up_interruptible(&data->read_wait);
-		spin_unlock_irqrestore(&data_saved_lock, flags);
-	}
-}
-
-/* Check for outstanding MCA/INIT records every minute (arbitrary) */
-#define SALINFO_TIMER_DELAY (60*HZ)
-static struct timer_list salinfo_timer;
-extern void ia64_mlogbuf_dump(void);
-
-static void
-salinfo_timeout_check(struct salinfo_data *data)
-{
-	if (!data->open)
-		return;
-	if (!cpumask_empty(&data->cpu_event))
-		wake_up_interruptible(&data->read_wait);
-}
-
-static void
-salinfo_timeout(struct timer_list *unused)
-{
-	ia64_mlogbuf_dump();
-	salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA);
-	salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT);
-	salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
-	add_timer(&salinfo_timer);
-}
-
-static int
-salinfo_event_open(struct inode *inode, struct file *file)
-{
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-	return 0;
-}
-
-static ssize_t
-salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
-{
-	struct salinfo_data *data = pde_data(file_inode(file));
-	char cmd[32];
-	size_t size;
-	int i, n, cpu = -1;
-
-retry:
-	if (cpumask_empty(&data->cpu_event)) {
-		if (file->f_flags & O_NONBLOCK)
-			return -EAGAIN;
-		if (wait_event_interruptible(data->read_wait,
-					     !cpumask_empty(&data->cpu_event)))
-			return -EINTR;
-	}
-
-	n = data->cpu_check;
-	for (i = 0; i < nr_cpu_ids; i++) {
-		if (cpumask_test_cpu(n, &data->cpu_event)) {
-			if (!cpu_online(n)) {
-				cpumask_clear_cpu(n, &data->cpu_event);
-				continue;
-			}
-			cpu = n;
-			break;
-		}
-		if (++n == nr_cpu_ids)
-			n = 0;
-	}
-
-	if (cpu == -1)
-		goto retry;
-
-	ia64_mlogbuf_dump();
-
-	/* for next read, start checking at next CPU */
-	data->cpu_check = cpu;
-	if (++data->cpu_check == nr_cpu_ids)
-		data->cpu_check = 0;
-
-	snprintf(cmd, sizeof(cmd), "read %d\n", cpu);
-
-	size = strlen(cmd);
-	if (size > count)
-		size = count;
-	if (copy_to_user(buffer, cmd, size))
-		return -EFAULT;
-
-	return size;
-}
-
-static const struct proc_ops salinfo_event_proc_ops = {
-	.proc_open	= salinfo_event_open,
-	.proc_read	= salinfo_event_read,
-	.proc_lseek	= noop_llseek,
-};
-
-static int
-salinfo_log_open(struct inode *inode, struct file *file)
-{
-	struct salinfo_data *data = pde_data(inode);
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	spin_lock(&data_lock);
-	if (data->open) {
-		spin_unlock(&data_lock);
-		return -EBUSY;
-	}
-	data->open = 1;
-	spin_unlock(&data_lock);
-
-	if (data->state == STATE_NO_DATA &&
-	    !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) {
-		data->open = 0;
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static int
-salinfo_log_release(struct inode *inode, struct file *file)
-{
-	struct salinfo_data *data = pde_data(inode);
-
-	if (data->state == STATE_NO_DATA) {
-		vfree(data->log_buffer);
-		vfree(data->oemdata);
-		data->log_buffer = NULL;
-		data->oemdata = NULL;
-	}
-	spin_lock(&data_lock);
-	data->open = 0;
-	spin_unlock(&data_lock);
-	return 0;
-}
-
-static long
-salinfo_log_read_cpu(void *context)
-{
-	struct salinfo_data *data = context;
-	sal_log_record_header_t *rh;
-	data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer);
-	rh = (sal_log_record_header_t *)(data->log_buffer);
-	/* Clear corrected errors as they are read from SAL */
-	if (rh->severity == sal_log_severity_corrected)
-		ia64_sal_clear_state_info(data->type);
-	return 0;
-}
-
-static void
-salinfo_log_new_read(int cpu, struct salinfo_data *data)
-{
-	struct salinfo_data_saved *data_saved;
-	unsigned long flags;
-	int i;
-	int saved_size = ARRAY_SIZE(data->data_saved);
-
-	data->saved_num = 0;
-	spin_lock_irqsave(&data_saved_lock, flags);
-retry:
-	for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
-		if (data_saved->buffer && data_saved->cpu == cpu) {
-			sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer);
-			data->log_size = data_saved->size;
-			memcpy(data->log_buffer, rh, data->log_size);
-			barrier();	/* id check must not be moved */
-			if (rh->id == data_saved->id) {
-				data->saved_num = i+1;
-				break;
-			}
-			/* saved record changed by mca.c since interrupt, discard it */
-			shift1_data_saved(data, i);
-			goto retry;
-		}
-	}
-	spin_unlock_irqrestore(&data_saved_lock, flags);
-
-	if (!data->saved_num)
-		work_on_cpu_safe(cpu, salinfo_log_read_cpu, data);
-	if (!data->log_size) {
-		data->state = STATE_NO_DATA;
-		cpumask_clear_cpu(cpu, &data->cpu_event);
-	} else {
-		data->state = STATE_LOG_RECORD;
-	}
-}
-
-static ssize_t
-salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
-{
-	struct salinfo_data *data = pde_data(file_inode(file));
-	u8 *buf;
-	u64 bufsize;
-
-	if (data->state == STATE_LOG_RECORD) {
-		buf = data->log_buffer;
-		bufsize = data->log_size;
-	} else if (data->state == STATE_OEMDATA) {
-		buf = data->oemdata;
-		bufsize = data->oemdata_size;
-	} else {
-		buf = NULL;
-		bufsize = 0;
-	}
-	return simple_read_from_buffer(buffer, count, ppos, buf, bufsize);
-}
-
-static long
-salinfo_log_clear_cpu(void *context)
-{
-	struct salinfo_data *data = context;
-
-	ia64_sal_clear_state_info(data->type);
-	return 0;
-}
-
-static int
-salinfo_log_clear(struct salinfo_data *data, int cpu)
-{
-	sal_log_record_header_t *rh;
-	unsigned long flags;
-	spin_lock_irqsave(&data_saved_lock, flags);
-	data->state = STATE_NO_DATA;
-	if (!cpumask_test_cpu(cpu, &data->cpu_event)) {
-		spin_unlock_irqrestore(&data_saved_lock, flags);
-		return 0;
-	}
-	cpumask_clear_cpu(cpu, &data->cpu_event);
-	if (data->saved_num) {
-		shift1_data_saved(data, data->saved_num - 1);
-		data->saved_num = 0;
-	}
-	spin_unlock_irqrestore(&data_saved_lock, flags);
-	rh = (sal_log_record_header_t *)(data->log_buffer);
-	/* Corrected errors have already been cleared from SAL */
-	if (rh->severity != sal_log_severity_corrected)
-		work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
-	/* clearing a record may make a new record visible */
-	salinfo_log_new_read(cpu, data);
-	if (data->state == STATE_LOG_RECORD) {
-		spin_lock_irqsave(&data_saved_lock, flags);
-		cpumask_set_cpu(cpu, &data->cpu_event);
-		wake_up_interruptible(&data->read_wait);
-		spin_unlock_irqrestore(&data_saved_lock, flags);
-	}
-	return 0;
-}
-
-static ssize_t
-salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
-{
-	struct salinfo_data *data = pde_data(file_inode(file));
-	char cmd[32];
-	size_t size;
-	u32 offset;
-	int cpu;
-
-	size = sizeof(cmd);
-	if (count < size)
-		size = count;
-	if (copy_from_user(cmd, buffer, size))
-		return -EFAULT;
-
-	if (sscanf(cmd, "read %d", &cpu) == 1) {
-		salinfo_log_new_read(cpu, data);
-	} else if (sscanf(cmd, "clear %d", &cpu) == 1) {
-		int ret;
-		if ((ret = salinfo_log_clear(data, cpu)))
-			count = ret;
-	} else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) {
-		if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA)
-			return -EINVAL;
-		if (offset > data->log_size - sizeof(efi_guid_t))
-			return -EINVAL;
-		data->state = STATE_OEMDATA;
-		if (salinfo_platform_oemdata) {
-			struct salinfo_platform_oemdata_parms parms = {
-				.efi_guid = data->log_buffer + offset,
-				.oemdata = &data->oemdata,
-				.oemdata_size = &data->oemdata_size
-			};
-			count = work_on_cpu_safe(cpu, salinfo_platform_oemdata_cpu,
-						 &parms);
-		} else
-			data->oemdata_size = 0;
-	} else
-		return -EINVAL;
-
-	return count;
-}
-
-static const struct proc_ops salinfo_data_proc_ops = {
-	.proc_open	= salinfo_log_open,
-	.proc_release	= salinfo_log_release,
-	.proc_read	= salinfo_log_read,
-	.proc_write	= salinfo_log_write,
-	.proc_lseek	= default_llseek,
-};
-
-static int salinfo_cpu_online(unsigned int cpu)
-{
-	unsigned int i, end = ARRAY_SIZE(salinfo_data);
-	struct salinfo_data *data;
-
-	spin_lock_irq(&data_saved_lock);
-	for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
-		cpumask_set_cpu(cpu, &data->cpu_event);
-		wake_up_interruptible(&data->read_wait);
-	}
-	spin_unlock_irq(&data_saved_lock);
-	return 0;
-}
-
-static int salinfo_cpu_pre_down(unsigned int cpu)
-{
-	unsigned int i, end = ARRAY_SIZE(salinfo_data);
-	struct salinfo_data *data;
-
-	spin_lock_irq(&data_saved_lock);
-	for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
-		struct salinfo_data_saved *data_saved;
-		int j = ARRAY_SIZE(data->data_saved) - 1;
-
-		for (data_saved = data->data_saved + j; j >= 0;
-		     --j, --data_saved) {
-			if (data_saved->buffer && data_saved->cpu == cpu)
-				shift1_data_saved(data, j);
-		}
-		cpumask_clear_cpu(cpu, &data->cpu_event);
-	}
-	spin_unlock_irq(&data_saved_lock);
-	return 0;
-}
-
-/*
- * 'data' contains an integer that corresponds to the feature we're
- * testing
- */
-static int __maybe_unused proc_salinfo_show(struct seq_file *m, void *v)
-{
-	unsigned long data = (unsigned long)v;
-	seq_puts(m, (sal_platform_features & data) ? "1\n" : "0\n");
-	return 0;
-}
-
-static int __init
-salinfo_init(void)
-{
-	struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */
-	struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */
-	struct proc_dir_entry *dir, *entry;
-	struct salinfo_data *data;
-	int i;
-
-	salinfo_dir = proc_mkdir("sal", NULL);
-	if (!salinfo_dir)
-		return 0;
-
-	for (i=0; i < NR_SALINFO_ENTRIES; i++) {
-		/* pass the feature bit in question as misc data */
-		*sdir++ = proc_create_single_data(salinfo_entries[i].name, 0,
-				salinfo_dir, proc_salinfo_show,
-				(void *)salinfo_entries[i].feature);
-	}
-
-	for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
-		data = salinfo_data + i;
-		data->type = i;
-		init_waitqueue_head(&data->read_wait);
-		dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
-		if (!dir)
-			continue;
-
-		entry = proc_create_data("event", S_IRUSR, dir,
-					 &salinfo_event_proc_ops, data);
-		if (!entry)
-			continue;
-		*sdir++ = entry;
-
-		entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir,
-					 &salinfo_data_proc_ops, data);
-		if (!entry)
-			continue;
-		*sdir++ = entry;
-
-		*sdir++ = dir;
-	}
-
-	*sdir++ = salinfo_dir;
-
-	timer_setup(&salinfo_timer, salinfo_timeout, 0);
-	salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
-	add_timer(&salinfo_timer);
-
-	i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/salinfo:online",
-			      salinfo_cpu_online, salinfo_cpu_pre_down);
-	WARN_ON(i < 0);
-	return 0;
-}
-
-module_init(salinfo_init);