Merge tag 'm68k-for-v6.7-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

Pull m68k updates from Geert Uytterhoeven:

 - misc aesthetical improvements for the floating point emulator

 - remove the last user of strlcpy()

 - use kernel's generic libgcc functions

 - misc fixes for W=1 builds

 - misc indentation fixes

 - misc fixes and improvements

 - defconfig updates

* tag 'm68k-for-v6.7-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k: (72 commits)
  m68k: lib: Include <linux/libgcc.h> for __muldi3()
  m68k: fpsp040: Fix indentation by 5 spaces
  m68k: Fix indentation by 2 or 5 spaces in <asm/page_mm.h>
  m68k: kernel: Fix indentation by 7 spaces in traps.c
  m68k: sun3: Fix indentation by 5 or 7 spaces
  m68k: Fix indentation by 7 spaces in <asm/io_mm.h>
  m68k: defconfig: Update virt_defconfig for v6.6-rc3
  m68k: defconfig: Update defconfigs for v6.6-rc1
  m68k: io: Mark mmio read addresses as const
  m68k: Replace GPL 2.0+ README.legal boilerplate with SPDX
  m68k: sun3: Change led_pattern[] to unsigned char
  m68k: Add missing types to asm/irq.h
  m68k: sun3/3x: Add and use "sun3.h"
  m68k: sun3x: Make dvma_print() static
  m68k: sun3x: Make sun3x_halt() static
  m68k: sun3x: Do not mark dvma_map_iommu() inline
  m68k: sun3x: Fix signature of sun3_leds()
  m68k: sun3: Make sun3_platform_init() static
  m68k: sun3: Make print_pte() static
  m68k: sun3: Annotate prom_printf() with __printf()
  ...

11 files changed, 135 insertions, 95 deletions

diff --git a/arch/m68k/include/asm/dvma.h b/arch/m68k/include/asm/dvma.h
index f609ec1de36d..d1d66d04844d 100644
--- a/arch/m68k/include/asm/dvma.h
+++ b/arch/m68k/include/asm/dvma.h
@@ -58,12 +58,16 @@ extern void dvma_free(void *vaddr);
 #define dvma_vtob(x) dvma_vtop(x)
 #define dvma_btov(x) dvma_ptov(x)
 
+void sun3_dvma_init(void);
+
 static inline int dvma_map_cpu(unsigned long kaddr, unsigned long vaddr,
 			       int len)
 {
 	return 0;
 }
 
+static inline void dvma_unmap_iommu(unsigned long baddr, int len) { }
+
 #else /* Sun3x */
 
 /* sun3x dvma page support */
@@ -78,9 +82,11 @@ static inline int dvma_map_cpu(unsigned long kaddr, unsigned long vaddr,
 #define dvma_vtob(x) ((unsigned long)(x) & 0x00ffffff)
 #define dvma_btov(x) ((unsigned long)(x) | 0xff000000)
 
-extern int dvma_map_cpu(unsigned long kaddr, unsigned long vaddr, int len);
+static inline void sun3_dvma_init(void) { }
 
+int dvma_map_cpu(unsigned long kaddr, unsigned long vaddr, int len);
 
+void dvma_unmap_iommu(unsigned long baddr, int len);
 
 /* everything below this line is specific to dma used for the onboard
    ESP scsi on sun3x */
diff --git a/arch/m68k/include/asm/io_mm.h b/arch/m68k/include/asm/io_mm.h
index 6a0abd4846c6..47525f2a57e1 100644
--- a/arch/m68k/include/asm/io_mm.h
+++ b/arch/m68k/include/asm/io_mm.h
@@ -272,20 +272,20 @@ static inline void isa_delay(void)
 #define isa_outsb(port, buf, nr) raw_outsb(isa_itb(port), (u8 *)(buf), (nr))
 
 #define isa_insw(port, buf, nr)     \
-       (ISA_SEX ? raw_insw(isa_itw(port), (u16 *)(buf), (nr)) :    \
-                  raw_insw_swapw(isa_itw(port), (u16 *)(buf), (nr)))
+	(ISA_SEX ? raw_insw(isa_itw(port), (u16 *)(buf), (nr)) :    \
+		   raw_insw_swapw(isa_itw(port), (u16 *)(buf), (nr)))
 
 #define isa_outsw(port, buf, nr)    \
-       (ISA_SEX ? raw_outsw(isa_itw(port), (u16 *)(buf), (nr)) :  \
-                  raw_outsw_swapw(isa_itw(port), (u16 *)(buf), (nr)))
+	(ISA_SEX ? raw_outsw(isa_itw(port), (u16 *)(buf), (nr)) :  \
+		   raw_outsw_swapw(isa_itw(port), (u16 *)(buf), (nr)))
 
 #define isa_insl(port, buf, nr)     \
-       (ISA_SEX ? raw_insl(isa_itl(port), (u32 *)(buf), (nr)) :    \
-                  raw_insw_swapw(isa_itw(port), (u16 *)(buf), (nr)<<1))
+	(ISA_SEX ? raw_insl(isa_itl(port), (u32 *)(buf), (nr)) :    \
+		   raw_insw_swapw(isa_itw(port), (u16 *)(buf), (nr)<<1))
 
 #define isa_outsl(port, buf, nr)    \
-       (ISA_SEX ? raw_outsl(isa_itl(port), (u32 *)(buf), (nr)) :  \
-                  raw_outsw_swapw(isa_itw(port), (u16 *)(buf), (nr)<<1))
+	(ISA_SEX ? raw_outsl(isa_itl(port), (u32 *)(buf), (nr)) :  \
+		   raw_outsw_swapw(isa_itw(port), (u16 *)(buf), (nr)<<1))
 
 
 #ifdef CONFIG_ATARI_ROM_ISA
@@ -297,14 +297,14 @@ static inline void isa_delay(void)
 #define isa_rom_insb(port, buf, nr) raw_rom_insb(isa_itb(port), (u8 *)(buf), (nr))
 
 #define isa_rom_insw(port, buf, nr)     \
-       (ISA_SEX ? raw_rom_insw(isa_itw(port), (u16 *)(buf), (nr)) :    \
-		  raw_rom_insw_swapw(isa_itw(port), (u16 *)(buf), (nr)))
+	(ISA_SEX ? raw_rom_insw(isa_itw(port), (u16 *)(buf), (nr)) :    \
+		   raw_rom_insw_swapw(isa_itw(port), (u16 *)(buf), (nr)))
 
 #define isa_rom_outsb(port, buf, nr) raw_rom_outsb(isa_itb(port), (u8 *)(buf), (nr))
 
 #define isa_rom_outsw(port, buf, nr)    \
-       (ISA_SEX ? raw_rom_outsw(isa_itw(port), (u16 *)(buf), (nr)) :  \
-		  raw_rom_outsw_swapw(isa_itw(port), (u16 *)(buf), (nr)))
+	(ISA_SEX ? raw_rom_outsw(isa_itw(port), (u16 *)(buf), (nr)) :  \
+		   raw_rom_outsw_swapw(isa_itw(port), (u16 *)(buf), (nr)))
 #endif /* CONFIG_ATARI_ROM_ISA */
 
 #endif  /* CONFIG_ISA || CONFIG_ATARI_ROM_ISA */
diff --git a/arch/m68k/include/asm/irq.h b/arch/m68k/include/asm/irq.h
index 7829e955ca04..14992fde7340 100644
--- a/arch/m68k/include/asm/irq.h
+++ b/arch/m68k/include/asm/irq.h
@@ -2,6 +2,9 @@
 #ifndef _M68K_IRQ_H_
 #define _M68K_IRQ_H_
 
+#include <linux/atomic.h>
+#include <linux/linkage.h>
+
 /*
  * This should be the same as the max(NUM_X_SOURCES) for all the
  * different m68k hosts compiled into the kernel.
@@ -59,6 +62,8 @@
 struct irq_data;
 struct irq_chip;
 struct irq_desc;
+struct pt_regs;
+
 extern unsigned int m68k_irq_startup(struct irq_data *data);
 extern unsigned int m68k_irq_startup_irq(unsigned int irq);
 extern void m68k_irq_shutdown(struct irq_data *data);
diff --git a/arch/m68k/include/asm/oplib.h b/arch/m68k/include/asm/oplib.h
index 48cb4fd09f8d..6d5ea67c65d0 100644
--- a/arch/m68k/include/asm/oplib.h
+++ b/arch/m68k/include/asm/oplib.h
@@ -9,6 +9,8 @@
 #ifndef __SPARC_OPLIB_H
 #define __SPARC_OPLIB_H
 
+#include <linux/compiler.h>
+
 #include <asm/openprom.h>
 
 /* The master romvec pointer... */
@@ -149,7 +151,7 @@ extern char prom_getchar(void);
 extern void prom_putchar(char character);
 
 /* Prom's internal printf routine, don't use in kernel/boot code. */
-void prom_printf(char *fmt, ...);
+__printf(1, 2) void prom_printf(char *fmt, ...);
 
 /* Query for input device type */
 
diff --git a/arch/m68k/include/asm/page_mm.h b/arch/m68k/include/asm/page_mm.h
index 363aa0f9ba8a..e0ae4d5fc985 100644
--- a/arch/m68k/include/asm/page_mm.h
+++ b/arch/m68k/include/asm/page_mm.h
@@ -13,17 +13,16 @@
 #ifdef CPU_M68040_OR_M68060_ONLY
 static inline void copy_page(void *to, void *from)
 {
-  unsigned long tmp;
-
-  __asm__ __volatile__("1:\t"
-		       ".chip 68040\n\t"
-		       "move16 %1@+,%0@+\n\t"
-		       "move16 %1@+,%0@+\n\t"
-		       ".chip 68k\n\t"
-		       "dbra  %2,1b\n\t"
-		       : "=a" (to), "=a" (from), "=d" (tmp)
-		       : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
-		       );
+	unsigned long tmp;
+
+	__asm__ __volatile__("1:\t"
+			     ".chip 68040\n\t"
+			     "move16 %1@+,%0@+\n\t"
+			     "move16 %1@+,%0@+\n\t"
+			     ".chip 68k\n\t"
+			     "dbra  %2,1b\n\t"
+			     : "=a" (to), "=a" (from), "=d" (tmp)
+			     : "0" (to), "1" (from), "2" (PAGE_SIZE / 32 - 1));
 }
 
 static inline void clear_page(void *page)
@@ -95,23 +94,23 @@ static inline void *__va(unsigned long paddr)
 #define __pa(x) ___pa((unsigned long)(x))
 static inline unsigned long ___pa(unsigned long x)
 {
-     if(x == 0)
-	  return 0;
-     if(x >= PAGE_OFFSET)
-        return (x-PAGE_OFFSET);
-     else
-        return (x+0x2000000);
+	if (x == 0)
+		return 0;
+	if (x >= PAGE_OFFSET)
+		return (x - PAGE_OFFSET);
+	else
+		return (x + 0x2000000);
 }
 
 static inline void *__va(unsigned long x)
 {
-     if(x == 0)
-	  return (void *)0;
+	if (x == 0)
+		return (void *)0;
 
-     if(x < 0x2000000)
-        return (void *)(x+PAGE_OFFSET);
-     else
-        return (void *)(x-0x2000000);
+	if (x < 0x2000000)
+		return (void *)(x + PAGE_OFFSET);
+	else
+		return (void *)(x - 0x2000000);
 }
 #endif	/* CONFIG_SUN3 */
 
diff --git a/arch/m68k/include/asm/pgtable.h b/arch/m68k/include/asm/pgtable.h
index ad15d655a9bf..27525c6a12fd 100644
--- a/arch/m68k/include/asm/pgtable.h
+++ b/arch/m68k/include/asm/pgtable.h
@@ -1,6 +1,15 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __M68K_PGTABLE_H
+#define __M68K_PGTABLE_H
+
 #ifdef __uClinux__
 #include <asm/pgtable_no.h>
 #else
 #include <asm/pgtable_mm.h>
 #endif
+
+#ifndef __ASSEMBLY__
+extern void paging_init(void);
+#endif
+
+#endif /* __M68K_PGTABLE_H */
diff --git a/arch/m68k/include/asm/pgtable_no.h b/arch/m68k/include/asm/pgtable_no.h
index fc044df52b96..1a86c15b9008 100644
--- a/arch/m68k/include/asm/pgtable_no.h
+++ b/arch/m68k/include/asm/pgtable_no.h
@@ -28,7 +28,6 @@
 #define PAGE_READONLY	__pgprot(0)
 #define PAGE_KERNEL	__pgprot(0)
 
-extern void paging_init(void);
 #define swapper_pg_dir ((pgd_t *) 0)
 
 /*
diff --git a/arch/m68k/include/asm/raw_io.h b/arch/m68k/include/asm/raw_io.h
index 3ba40bc1dfaa..95a6ff694a68 100644
--- a/arch/m68k/include/asm/raw_io.h
+++ b/arch/m68k/include/asm/raw_io.h
@@ -17,15 +17,15 @@
  * two accesses to memory, which may be undesirable for some devices.
  */
 #define in_8(addr) \
-    ({ u8 __v = (*(__force volatile u8 *) (unsigned long)(addr)); __v; })
+    ({ u8 __v = (*(__force const volatile u8 *) (unsigned long)(addr)); __v; })
 #define in_be16(addr) \
-    ({ u16 __v = (*(__force volatile u16 *) (unsigned long)(addr)); __v; })
+    ({ u16 __v = (*(__force const volatile u16 *) (unsigned long)(addr)); __v; })
 #define in_be32(addr) \
-    ({ u32 __v = (*(__force volatile u32 *) (unsigned long)(addr)); __v; })
+    ({ u32 __v = (*(__force const volatile u32 *) (unsigned long)(addr)); __v; })
 #define in_le16(addr) \
-    ({ u16 __v = le16_to_cpu(*(__force volatile __le16 *) (unsigned long)(addr)); __v; })
+    ({ u16 __v = le16_to_cpu(*(__force const volatile __le16 *) (unsigned long)(addr)); __v; })
 #define in_le32(addr) \
-    ({ u32 __v = le32_to_cpu(*(__force volatile __le32 *) (unsigned long)(addr)); __v; })
+    ({ u32 __v = le32_to_cpu(*(__force const volatile __le32 *) (unsigned long)(addr)); __v; })
 
 #define out_8(addr,b) (void)((*(__force volatile u8 *) (unsigned long)(addr)) = (b))
 #define out_be16(addr,w) (void)((*(__force volatile u16 *) (unsigned long)(addr)) = (w))
@@ -73,11 +73,11 @@
 
 #if defined(CONFIG_ATARI_ROM_ISA)
 #define rom_in_8(addr) \
-	({ u16 __v = (*(__force volatile u16 *) (addr)); __v >>= 8; __v; })
+	({ u16 __v = (*(__force const volatile u16 *) (addr)); __v >>= 8; __v; })
 #define rom_in_be16(addr) \
-	({ u16 __v = (*(__force volatile u16 *) (addr)); __v; })
+	({ u16 __v = (*(__force const volatile u16 *) (addr)); __v; })
 #define rom_in_le16(addr) \
-	({ u16 __v = le16_to_cpu(*(__force volatile u16 *) (addr)); __v; })
+	({ u16 __v = le16_to_cpu(*(__force const volatile u16 *) (addr)); __v; })
 
 #define rom_out_8(addr, b)	\
 	(void)({u8 __maybe_unused __w, __v = (b);  u32 _addr = ((u32) (addr)); \
@@ -98,7 +98,8 @@
 #define raw_rom_outw(val, port) rom_out_be16((port), (val))
 #endif /* CONFIG_ATARI_ROM_ISA */
 
-static inline void raw_insb(volatile u8 __iomem *port, u8 *buf, unsigned int len)
+static inline void raw_insb(const volatile u8 __iomem *port, u8 *buf,
+			    unsigned int len)
 {
 	unsigned int i;
 
@@ -146,7 +147,7 @@ static inline void raw_outsb(volatile u8 __iomem *port, const u8 *buf,
 	}
 }
 
-static inline void raw_insw(volatile u16 __iomem *port, u16 *buf, unsigned int nr)
+static inline void raw_insw(volatile const u16 __iomem *port, u16 *buf, unsigned int nr)
 {
 	unsigned int tmp;
 
@@ -225,7 +226,7 @@ static inline void raw_outsw(volatile u16 __iomem *port, const u16 *buf,
 	}
 }
 
-static inline void raw_insl(volatile u32 __iomem *port, u32 *buf, unsigned int nr)
+static inline void raw_insl(const volatile u32 __iomem *port, u32 *buf, unsigned int nr)
 {
 	unsigned int tmp;
 
@@ -305,7 +306,7 @@ static inline void raw_outsl(volatile u32 __iomem *port, const u32 *buf,
 }
 
 
-static inline void raw_insw_swapw(volatile u16 __iomem *port, u16 *buf,
+static inline void raw_insw_swapw(const volatile u16 __iomem *port, u16 *buf,
 				  unsigned int nr)
 {
     if ((nr) % 8)
@@ -413,7 +414,8 @@ static inline void raw_outsw_swapw(volatile u16 __iomem *port, const u16 *buf,
 
 
 #if defined(CONFIG_ATARI_ROM_ISA)
-static inline void raw_rom_insb(volatile u8 __iomem *port, u8 *buf, unsigned int len)
+static inline void raw_rom_insb(const volatile u8 __iomem *port, u8 *buf,
+				unsigned int len)
 {
 	unsigned int i;
 
@@ -430,7 +432,7 @@ static inline void raw_rom_outsb(volatile u8 __iomem *port, const u8 *buf,
 		rom_out_8(port, *buf++);
 }
 
-static inline void raw_rom_insw(volatile u16 __iomem *port, u16 *buf,
+static inline void raw_rom_insw(const volatile u16 __iomem *port, u16 *buf,
 				   unsigned int nr)
 {
 	unsigned int i;
@@ -448,7 +450,7 @@ static inline void raw_rom_outsw(volatile u16 __iomem *port, const u16 *buf,
 		rom_out_be16(port, *buf++);
 }
 
-static inline void raw_rom_insw_swapw(volatile u16 __iomem *port, u16 *buf,
+static inline void raw_rom_insw_swapw(const volatile u16 __iomem *port, u16 *buf,
 				   unsigned int nr)
 {
 	unsigned int i;
diff --git a/arch/m68k/include/asm/sun3_pgalloc.h b/arch/m68k/include/asm/sun3_pgalloc.h
index ff48573db2c0..4a137eecb6fe 100644
--- a/arch/m68k/include/asm/sun3_pgalloc.h
+++ b/arch/m68k/include/asm/sun3_pgalloc.h
@@ -41,12 +41,12 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page
 
 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
 {
-     pgd_t *new_pgd;
+	pgd_t *new_pgd;
 
-     new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
-     memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
-     memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
-     return new_pgd;
+	new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
+	memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
+	memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
+	return new_pgd;
 }
 
 #endif /* SUN3_PGALLOC_H */
diff --git a/arch/m68k/include/asm/syscalls.h b/arch/m68k/include/asm/syscalls.h
new file mode 100644
index 000000000000..fb3639acd07b
--- /dev/null
+++ b/arch/m68k/include/asm/syscalls.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ASM_M68K_SYSCALLS_H
+#define _ASM_M68K_SYSCALLS_H
+
+#include <linux/compiler_types.h>
+#include <linux/linkage.h>
+
+asmlinkage int sys_cacheflush(unsigned long addr, int scope, int cache,
+			      unsigned long len);
+asmlinkage int sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3,
+				     int d4, int d5, unsigned long __user *mem);
+asmlinkage int sys_getpagesize(void);
+asmlinkage unsigned long sys_get_thread_area(void);
+asmlinkage int sys_set_thread_area(unsigned long tp);
+asmlinkage int sys_atomic_barrier(void);
+
+#include <asm-generic/syscalls.h>
+
+#endif	/* _ASM_M68K_SYSCALLS_H */
diff --git a/arch/m68k/include/asm/tlbflush.h b/arch/m68k/include/asm/tlbflush.h
index b882e2f4f551..6d42e2906887 100644
--- a/arch/m68k/include/asm/tlbflush.h
+++ b/arch/m68k/include/asm/tlbflush.h
@@ -112,53 +112,51 @@ extern unsigned char pmeg_ctx[SUN3_PMEGS_NUM];
    sun?) */
 static inline void flush_tlb_all(void)
 {
-       unsigned long addr;
-       unsigned char ctx, oldctx;
-
-       oldctx = sun3_get_context();
-       for(addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) {
-	       for(ctx = 0; ctx < 8; ctx++) {
-		       sun3_put_context(ctx);
-		       sun3_put_segmap(addr, SUN3_INVALID_PMEG);
-	       }
-       }
-
-       sun3_put_context(oldctx);
-       /* erase all of the userspace pmeg maps, we've clobbered them
-	  all anyway */
-       for(addr = 0; addr < SUN3_INVALID_PMEG; addr++) {
-	       if(pmeg_alloc[addr] == 1) {
-		       pmeg_alloc[addr] = 0;
-		       pmeg_ctx[addr] = 0;
-		       pmeg_vaddr[addr] = 0;
-	       }
-       }
+	unsigned long addr;
+	unsigned char ctx, oldctx;
 
+	oldctx = sun3_get_context();
+	for (addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) {
+		for (ctx = 0; ctx < 8; ctx++) {
+			sun3_put_context(ctx);
+			sun3_put_segmap(addr, SUN3_INVALID_PMEG);
+		}
+	}
+
+	sun3_put_context(oldctx);
+	/* erase all of the userspace pmeg maps, we've clobbered them
+	   all anyway */
+	for (addr = 0; addr < SUN3_INVALID_PMEG; addr++) {
+		if (pmeg_alloc[addr] == 1) {
+			pmeg_alloc[addr] = 0;
+			pmeg_ctx[addr] = 0;
+			pmeg_vaddr[addr] = 0;
+		}
+	}
 }
 
 /* Clear user TLB entries within the context named in mm */
 static inline void flush_tlb_mm (struct mm_struct *mm)
 {
-     unsigned char oldctx;
-     unsigned char seg;
-     unsigned long i;
-
-     oldctx = sun3_get_context();
-     sun3_put_context(mm->context);
+	unsigned char oldctx;
+	unsigned char seg;
+	unsigned long i;
 
-     for(i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) {
-	     seg = sun3_get_segmap(i);
-	     if(seg == SUN3_INVALID_PMEG)
-		     continue;
+	oldctx = sun3_get_context();
+	sun3_put_context(mm->context);
 
-	     sun3_put_segmap(i, SUN3_INVALID_PMEG);
-	     pmeg_alloc[seg] = 0;
-	     pmeg_ctx[seg] = 0;
-	     pmeg_vaddr[seg] = 0;
-     }
+	for (i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) {
+		seg = sun3_get_segmap(i);
+		if (seg == SUN3_INVALID_PMEG)
+			continue;
 
-     sun3_put_context(oldctx);
+		sun3_put_segmap(i, SUN3_INVALID_PMEG);
+		pmeg_alloc[seg] = 0;
+		pmeg_ctx[seg] = 0;
+		pmeg_vaddr[seg] = 0;
+	}
 
+	sun3_put_context(oldctx);
 }
 
 /* Flush a single TLB page. In this case, we're limited to flushing a
@@ -208,6 +206,7 @@ static inline void flush_tlb_range (struct vm_area_struct *vma,
 	next:
 		start += SUN3_PMEG_SIZE;
 	}
+	sun3_put_context(oldctx);
 }
 
 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)