parisc architecture fixes for kernel v7.3-rc5:

- Increase kernel stack to 32kB on 64-bit kernel to avoid crashes
 - Parse early parameters in setup_arch() to enable huge page settings
 - Replace open-coded binary search with bsearch() in unwind code
 - Remove unused <asm/compat_ucontext.h> header
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Merge tag 'parisc-for-7.3-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc architecture fixes from Helge Deller:

 - Increase kernel stack to 32kB on 64-bit kernel to avoid crashes

 - Parse early parameters in setup_arch() to enable huge page settings

 - Replace open-coded binary search with bsearch() in unwind code

 - Remove unused <asm/compat_ucontext.h> header

* tag 'parisc-for-7.3-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Increase kernel stack size to 32kb
  parisc: parse early parameters in setup_arch()
  parisc: remove unused <asm/compat_ucontext.h> header
  parisc: unwind: Replace open-coded binary search with bsearch()

arch/parisc/include/asm/compat_ucontext.h

@@ -1,18 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_PARISC_COMPAT_UCONTEXT_H
-#define _ASM_PARISC_COMPAT_UCONTEXT_H
-
-#include <linux/compat.h>
-
-/* 32-bit ucontext as seen from an 64-bit kernel */
-struct compat_ucontext {
-	compat_uint_t uc_flags;
-	compat_uptr_t uc_link;
-	compat_stack_t uc_stack;	/* struct compat_sigaltstack (12 bytes)*/	
-	/* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */
-	compat_uint_t pad[1];
-	struct compat_sigcontext uc_mcontext;
-	compat_sigset_t uc_sigmask;	/* mask last for extensibility */
-};
-
-#endif /* !_ASM_PARISC_COMPAT_UCONTEXT_H */

arch/parisc/include/asm/thread_info.h

@@ -24,7 +24,7 @@ struct thread_info {
 
 /* thread information allocation */
 
-#ifdef CONFIG_IRQSTACKS
+#if defined(CONFIG_IRQSTACKS) && !defined(CONFIG_64BIT)
 #define THREAD_SIZE_ORDER	2 /* PA-RISC requires at least 16k stack */
 #else
 #define THREAD_SIZE_ORDER	3 /* PA-RISC requires at least 32k stack */

arch/parisc/kernel/setup.c

@@ -132,6 +132,18 @@ void __init setup_arch(char **cmdline_p)
 	parisc_cache_init();
 	paging_init();
 
+	/*
+	 * Parse early parameters before mm_core_init_early() runs.
+	 * Several early_param() handlers only record data that is consumed
+	 * from there - for example hugepages=, hugepagesz=,
+	 * default_hugepagesz=, hugetlb_cma= and hugetlb_free_vmemmap= - so
+	 * the generic parse_early_param() call in start_kernel() is too late
+	 * for them.  jump_label_init() must come first, since early param
+	 * handlers may enable or disable static keys.
+	 */
+	jump_label_init();
+	parse_early_param();
+
 #ifdef CONFIG_PA11
 	dma_ops_init();
 #endif

arch/parisc/kernel/unwind.c

@@ -14,6 +14,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/sort.h>
+#include <linux/bsearch.h>
 #include <linux/sched/task_stack.h>
 
 #include <linux/uaccess.h>
@@ -49,27 +50,23 @@ static DEFINE_SPINLOCK(unwind_lock);
 static struct unwind_table kernel_unwind_table __ro_after_init;
 static LIST_HEAD(unwind_tables);
 
+static int cmp_unwind_entry(const void *key, const void *elt)
+{
+	unsigned long addr = (unsigned long)key;
+	const struct unwind_table_entry *e = elt;
+
+	if (addr < e->region_start)
+		return -1;
+	if (addr > e->region_end)
+		return 1;
+	return 0;
+}
+
 static inline const struct unwind_table_entry *
 find_unwind_entry_in_table(const struct unwind_table *table, unsigned long addr)
 {
-	const struct unwind_table_entry *e = NULL;
-	unsigned long lo, hi, mid;
-
-	lo = 0; 
-	hi = table->length - 1; 
-	
-	while (lo <= hi) {
-		mid = (hi - lo) / 2 + lo;
-		e = &table->table[mid];
-		if (addr < e->region_start)
-			hi = mid - 1;
-		else if (addr > e->region_end)
-			lo = mid + 1;
-		else
-			return e;
-	}
-
-	return NULL;
+	return bsearch((void *)addr, table->table, table->length,
+		       sizeof(*table->table), cmp_unwind_entry);
 }
 
 static const struct unwind_table_entry *