arm64 fixes for -rc4

- Fix two boot issues caused by the recent head.S rework when !KASLR
 
 - Fix calculation of crashkernel memory reservation
 
 - Fix bogus error check in PMU IRQ probing code
 -----BEGIN PGP SIGNATURE-----
 
 iQFEBAABCgAuFiEEPxTL6PPUbjXGY88ct6xw3ITBYzQFAmMRwE8QHHdpbGxAa2Vy
 bmVsLm9yZwAKCRC3rHDchMFjNP6lB/4m0NNn4PQJ5FmTBuNurwB+CvZyC/pl/exL
 reXG0hwI+ApX1xj6aD7tZ3tB+mi6EG0+3PBLuJ4KuSNecwwT/au5ZxAipsc+IRs0
 EI4loeItzTaevaVTyydsTMgXYAJlCHlMDxEI0QIW3/datH10bZ1GzhEDL/Ebflfu
 Mo4g0/+eysGmSHtj7kL5IU4bE+CCXnXycphgCLAn0qcdxuF/iZphu/GgB4Az6gSS
 9ks3HJkO+X1UVb8qK0prVDsalX2z5tTWbxQ7XACJ4KEVEiSqh7ei3B283cF+Zeip
 3PSg6gkPC5YZmLjv431B/pAycsx/x8KeXY0yDAadTRmOQYROMm0j
 =a7xW
 -----END PGP SIGNATURE-----

Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "It's a lot smaller than last week, with the star of the show being a
  couple of fixes to head.S addressing a boot regression introduced by
  the recent overhaul of that code in non-default configurations (i.e.
  KASLR disabled).

  The first of those two resolves the issue reported (and bisected) by
  Mikulus in the wait_on_bit() thread.

  Summary:

   - Fix two boot issues caused by the recent head.S rework when !KASLR

   - Fix calculation of crashkernel memory reservation

   - Fix bogus error check in PMU IRQ probing code"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: mm: Reserve enough pages for the initial ID map
  perf/arm_pmu_platform: fix tests for platform_get_irq() failure
  arm64: head: Ignore bogus KASLR displacement on non-relocatable kernels
  arm64/kexec: Fix missing extra range for crashkres_low.

arch/arm64/include/asm/kernel-pgtable.h

@@ -64,28 +64,28 @@
 #define EARLY_KASLR	(0)
 #endif
 
-#define EARLY_ENTRIES(vstart, vend, shift) \
-	((((vend) - 1) >> (shift)) - ((vstart) >> (shift)) + 1 + EARLY_KASLR)
+#define EARLY_ENTRIES(vstart, vend, shift, add) \
+	((((vend) - 1) >> (shift)) - ((vstart) >> (shift)) + 1 + add)
 
-#define EARLY_PGDS(vstart, vend) (EARLY_ENTRIES(vstart, vend, PGDIR_SHIFT))
+#define EARLY_PGDS(vstart, vend, add) (EARLY_ENTRIES(vstart, vend, PGDIR_SHIFT, add))
 
 #if SWAPPER_PGTABLE_LEVELS > 3
-#define EARLY_PUDS(vstart, vend) (EARLY_ENTRIES(vstart, vend, PUD_SHIFT))
+#define EARLY_PUDS(vstart, vend, add) (EARLY_ENTRIES(vstart, vend, PUD_SHIFT, add))
 #else
-#define EARLY_PUDS(vstart, vend) (0)
+#define EARLY_PUDS(vstart, vend, add) (0)
 #endif
 
 #if SWAPPER_PGTABLE_LEVELS > 2
-#define EARLY_PMDS(vstart, vend) (EARLY_ENTRIES(vstart, vend, SWAPPER_TABLE_SHIFT))
+#define EARLY_PMDS(vstart, vend, add) (EARLY_ENTRIES(vstart, vend, SWAPPER_TABLE_SHIFT, add))
 #else
-#define EARLY_PMDS(vstart, vend) (0)
+#define EARLY_PMDS(vstart, vend, add) (0)
 #endif
 
-#define EARLY_PAGES(vstart, vend) ( 1 			/* PGDIR page */				\
-			+ EARLY_PGDS((vstart), (vend)) 	/* each PGDIR needs a next level page table */	\
-			+ EARLY_PUDS((vstart), (vend))	/* each PUD needs a next level page table */	\
-			+ EARLY_PMDS((vstart), (vend)))	/* each PMD needs a next level page table */
-#define INIT_DIR_SIZE (PAGE_SIZE * EARLY_PAGES(KIMAGE_VADDR, _end))
+#define EARLY_PAGES(vstart, vend, add) ( 1 			/* PGDIR page */				\
+			+ EARLY_PGDS((vstart), (vend), add) 	/* each PGDIR needs a next level page table */	\
+			+ EARLY_PUDS((vstart), (vend), add)	/* each PUD needs a next level page table */	\
+			+ EARLY_PMDS((vstart), (vend), add))	/* each PMD needs a next level page table */
+#define INIT_DIR_SIZE (PAGE_SIZE * EARLY_PAGES(KIMAGE_VADDR, _end, EARLY_KASLR))
 
 /* the initial ID map may need two extra pages if it needs to be extended */
 #if VA_BITS < 48
@@ -93,7 +93,7 @@
 #else
 #define INIT_IDMAP_DIR_SIZE	(INIT_IDMAP_DIR_PAGES * PAGE_SIZE)
 #endif
-#define INIT_IDMAP_DIR_PAGES	EARLY_PAGES(KIMAGE_VADDR, _end + MAX_FDT_SIZE + SWAPPER_BLOCK_SIZE)
+#define INIT_IDMAP_DIR_PAGES	EARLY_PAGES(KIMAGE_VADDR, _end + MAX_FDT_SIZE + SWAPPER_BLOCK_SIZE, 1)
 
 /* Initial memory map size */
 #if ARM64_KERNEL_USES_PMD_MAPS

arch/arm64/kernel/head.S

@@ -371,7 +371,9 @@ SYM_FUNC_END(create_idmap)
 SYM_FUNC_START_LOCAL(create_kernel_mapping)
 	adrp	x0, init_pg_dir
 	mov_q	x5, KIMAGE_VADDR		// compile time __va(_text)
+#ifdef CONFIG_RELOCATABLE
 	add	x5, x5, x23			// add KASLR displacement
+#endif
 	adrp	x6, _end			// runtime __pa(_end)
 	adrp	x3, _text			// runtime __pa(_text)
 	sub	x6, x6, x3			// _end - _text

arch/arm64/kernel/machine_kexec_file.c

@@ -47,7 +47,7 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)
 	u64 i;
 	phys_addr_t start, end;
 
-	nr_ranges = 1; /* for exclusion of crashkernel region */
+	nr_ranges = 2; /* for exclusion of crashkernel region */
 	for_each_mem_range(i, &start, &end)
 		nr_ranges++;
 

drivers/perf/arm_pmu_platform.c

@@ -117,7 +117,7 @@ static int pmu_parse_irqs(struct arm_pmu *pmu)
 
 	if (num_irqs == 1) {
 		int irq = platform_get_irq(pdev, 0);
-		if (irq && irq_is_percpu_devid(irq))
+		if ((irq > 0) && irq_is_percpu_devid(irq))
 			return pmu_parse_percpu_irq(pmu, irq);
 	}