Merge tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc updates from Helge Deller:
 "Lots of new features and fixes:

   - Added TOC (table of content) support, which is a debugging feature
     which is either initiated by pressing the TOC button or via command
     in the BMC. If pressed the Linux built-in KDB/KGDB will be called
     (Sven Schnelle)

   - Fix CONFIG_PREEMPT (Sven)

   - Fix unwinder on 64-bit kernels (Sven)

   - Various kgdb fixes (Sven)

   - Added KFENCE support (me)

   - Switch to ARCH_STACKWALK implementation (me)

   - Fix ptrace check on syscall return (me)

   - Fix kernel crash with fixmaps on PA1.x machines (me)

   - Move thread_info into task struct, aka CONFIG_THREAD_INFO_IN_TASK
     (me)

   - Updated defconfigs

   - Smaller cleanups, including Makefile cleanups (Masahiro Yamada),
     use kthread_run() macro (Cai Huoqing), use swap() macro (Yihao
     Han)"

* tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (36 commits)
  parisc: Fix set_fixmap() on PA1.x CPUs
  parisc: Use swap() to swap values in setup_bootmem()
  parisc: Update defconfigs
  parisc: decompressor: clean up Makefile
  parisc: decompressor: remove repeated depenency of misc.o
  parisc: Remove unused constants from asm-offsets.c
  parisc/ftrace: use static key to enable/disable function graph tracer
  parisc/ftrace: set function trace function
  parisc: Make use of the helper macro kthread_run()
  parisc: mark xchg functions notrace
  parisc: enhance warning regarding usage of O_NONBLOCK
  parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers
  parisc: Use PRIV_USER and PRIV_KERNEL in ptrace.h
  parisc: Use PRIV_USER in syscall.S
  parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling
  parisc: Move thread_info into task struct
  parisc: add support for TOC (transfer of control)
  parisc/firmware: add functions to retrieve TOC data
  parisc: add PIM TOC data structures
  parisc: move virt_map macro to assembly.h
  ...

1 files changed, 36 insertions, 51 deletions

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 39e02227e231..c61827e4928a 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -543,10 +543,33 @@ static inline pte_t *get_ptep(pgd_t *pgd, unsigned long addr)
 	return ptep;
 }
 
+static void flush_cache_pages(struct vm_area_struct *vma, struct mm_struct *mm,
+			      unsigned long start, unsigned long end)
+{
+	unsigned long addr, pfn;
+	pte_t *ptep;
+
+	for (addr = start; addr < end; addr += PAGE_SIZE) {
+		ptep = get_ptep(mm->pgd, addr);
+		if (ptep) {
+			pfn = pte_pfn(*ptep);
+			flush_cache_page(vma, addr, pfn);
+		}
+	}
+}
+
+static void flush_user_cache_tlb(struct vm_area_struct *vma,
+				 unsigned long start, unsigned long end)
+{
+	flush_user_dcache_range_asm(start, end);
+	if (vma->vm_flags & VM_EXEC)
+		flush_user_icache_range_asm(start, end);
+	flush_tlb_range(vma, start, end);
+}
+
 void flush_cache_mm(struct mm_struct *mm)
 {
 	struct vm_area_struct *vma;
-	pgd_t *pgd;
 
 	/* Flushing the whole cache on each cpu takes forever on
 	   rp3440, etc.  So, avoid it if the mm isn't too big.  */
@@ -558,45 +581,22 @@ void flush_cache_mm(struct mm_struct *mm)
 		return;
 	}
 
+	preempt_disable();
 	if (mm->context == mfsp(3)) {
-		for (vma = mm->mmap; vma; vma = vma->vm_next) {
-			flush_user_dcache_range_asm(vma->vm_start, vma->vm_end);
-			if (vma->vm_flags & VM_EXEC)
-				flush_user_icache_range_asm(vma->vm_start, vma->vm_end);
-			flush_tlb_range(vma, vma->vm_start, vma->vm_end);
-		}
+		for (vma = mm->mmap; vma; vma = vma->vm_next)
+			flush_user_cache_tlb(vma, vma->vm_start, vma->vm_end);
+		preempt_enable();
 		return;
 	}
 
-	pgd = mm->pgd;
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
-		unsigned long addr;
-
-		for (addr = vma->vm_start; addr < vma->vm_end;
-		     addr += PAGE_SIZE) {
-			unsigned long pfn;
-			pte_t *ptep = get_ptep(pgd, addr);
-			if (!ptep)
-				continue;
-			pfn = pte_pfn(*ptep);
-			if (!pfn_valid(pfn))
-				continue;
-			if (unlikely(mm->context)) {
-				flush_tlb_page(vma, addr);
-				__flush_cache_page(vma, addr, PFN_PHYS(pfn));
-			} else {
-				__purge_cache_page(vma, addr, PFN_PHYS(pfn));
-			}
-		}
-	}
+	for (vma = mm->mmap; vma; vma = vma->vm_next)
+		flush_cache_pages(vma, mm, vma->vm_start, vma->vm_end);
+	preempt_enable();
 }
 
 void flush_cache_range(struct vm_area_struct *vma,
 		unsigned long start, unsigned long end)
 {
-	pgd_t *pgd;
-	unsigned long addr;
-
 	if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
 	    end - start >= parisc_cache_flush_threshold) {
 		if (vma->vm_mm->context)
@@ -605,30 +605,15 @@ void flush_cache_range(struct vm_area_struct *vma,
 		return;
 	}
 
+	preempt_disable();
 	if (vma->vm_mm->context == mfsp(3)) {
-		flush_user_dcache_range_asm(start, end);
-		if (vma->vm_flags & VM_EXEC)
-			flush_user_icache_range_asm(start, end);
-		flush_tlb_range(vma, start, end);
+		flush_user_cache_tlb(vma, start, end);
+		preempt_enable();
 		return;
 	}
 
-	pgd = vma->vm_mm->pgd;
-	for (addr = vma->vm_start; addr < vma->vm_end; addr += PAGE_SIZE) {
-		unsigned long pfn;
-		pte_t *ptep = get_ptep(pgd, addr);
-		if (!ptep)
-			continue;
-		pfn = pte_pfn(*ptep);
-		if (pfn_valid(pfn)) {
-			if (unlikely(vma->vm_mm->context)) {
-				flush_tlb_page(vma, addr);
-				__flush_cache_page(vma, addr, PFN_PHYS(pfn));
-			} else {
-				__purge_cache_page(vma, addr, PFN_PHYS(pfn));
-			}
-		}
-	}
+	flush_cache_pages(vma, vma->vm_mm, vma->vm_start, vma->vm_end);
+	preempt_enable();
 }
 
 void