Merge branch 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc updates from Helge Deller:
 "Many great new features, fixes and optimizations, including:

   - Convert page table updates to use per-pagetable spinlocks which
     overall improves performance on SMP machines a lot, by Mikulas
     Patocka

   - Kernel debugger (KGDB) support, by Sven Schnelle

   - KPROBES support, by Sven Schnelle

   - Lots of TLB lock/flush improvements, by Dave Anglin

   - Drop DISCONTIGMEM and switch to SPARSEMEM

   - Added JUMP_LABEL, branch runtime-patching support

   - Lots of other small speedups and cleanups, e.g. for QEMU, stack
     randomization, avoidance of name clashes, documentation updates,
     etc ..."

* 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (28 commits)
  parisc: Add static branch and JUMP_LABEL feature
  parisc: Use PA_ASM_LEVEL in boot code
  parisc: Rename LEVEL to PA_ASM_LEVEL to avoid name clash with DRBD code
  parisc: Update huge TLB page support to use per-pagetable spinlock
  parisc: Use per-pagetable spinlock
  parisc: Allow live-patching of __meminit functions
  parisc: Add memory barrier to asm pdc and sync instructions
  parisc: Add memory clobber to TLB purges
  parisc: Use ldcw instruction for SMP spinlock release barrier
  parisc: Remove lock code to serialize TLB operations in pacache.S
  parisc: Switch from DISCONTIGMEM to SPARSEMEM
  parisc: enable wide mode early
  parisc: update feature lists
  parisc: Show n/a if product number not available
  parisc: remove unused flags parameter in __patch_text()
  doc: update kprobes supported architecture list
  parisc: Implement kretprobes
  parisc: remove kprobes.h from generic-y
  parisc: Implement kprobes
  parisc: add functions required by KPROBE_EVENTS
  ...

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/parisc/mm/fixmap.c b/arch/parisc/mm/fixmap.c
new file mode 100644
index 000000000000..c8d41b54fb19
--- /dev/null
+++ b/arch/parisc/mm/fixmap.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * fixmaps for parisc
+ *
+ * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
+ */
+
+#include <linux/kprobes.h>
+#include <linux/mm.h>
+#include <asm/cacheflush.h>
+#include <asm/fixmap.h>
+
+void set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
+{
+	unsigned long vaddr = __fix_to_virt(idx);
+	pgd_t *pgd = pgd_offset_k(vaddr);
+	pmd_t *pmd = pmd_offset(pgd, vaddr);
+	pte_t *pte;
+
+	if (pmd_none(*pmd))
+		pmd = pmd_alloc(NULL, pgd, vaddr);
+
+	pte = pte_offset_kernel(pmd, vaddr);
+	if (pte_none(*pte))
+		pte = pte_alloc_kernel(pmd, vaddr);
+
+	set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
+	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
+}
+
+void clear_fixmap(enum fixed_addresses idx)
+{
+	unsigned long vaddr = __fix_to_virt(idx);
+	pgd_t *pgd = pgd_offset_k(vaddr);
+	pmd_t *pmd = pmd_offset(pgd, vaddr);
+	pte_t *pte = pte_offset_kernel(pmd, vaddr);
+
+	pte_clear(&init_mm, vaddr, pte);
+
+	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
+}