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Commit 5659c0e4 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 

Pull ARM fixes from Russell King:
 "A number of ARM fixes, the biggest is fixing a regression caused by
  appended DT blobs exceeding 64K, causing the decompressor fixup code
  to fail to patch the DT blob.  Another important fix is for the ASID
  allocator from Will Deacon which prevents some rare crashes seen on
  some systems.  Lastly, there's a build fix for v7M systems when printk
  support is disabled.

  The last two remaining fixes are more cosmetic - the IOMMU one
  prevents an annoying harmless warning message, and we disable the
  kernel strict memory permissions on non-MMU which can't support it
  anyway"

* 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  ARM: 8299/1: mm: ensure local active ASID is marked as allocated on rollover
  ARM: 8298/1: ARM_KERNMEM_PERMS only works with MMU enabled
  ARM: 8295/1: fix v7M build for !CONFIG_PRINTK
  ARM: 8294/1: ATAG_DTB_COMPAT: remove the DT workspace's hardcoded 64KB size
  ARM: 8288/1: dma-mapping: don't detach devices without an IOMMU during teardown
parents dc6d6844 8e648066

arch/arm/boot/compressed/head.S

+30 −9
Original line number Diff line number Diff line
@@ -263,16 +263,37 @@ restart: adr r0, LC0 
		 * OK... Let's do some funky business here.

		 * If we do have a DTB appended to zImage, and we do have

		 * an ATAG list around, we want the later to be translated

		 * and folded into the former here.  To be on the safe side,

		 * let's temporarily move  the stack away into the malloc

		 * area.  No GOT fixup has occurred yet, but none of the

		 * code we're about to call uses any global variable.

		 * and folded into the former here. No GOT fixup has occurred

		 * yet, but none of the code we're about to call uses any

		 * global variable.

		*/

		add	sp, sp, #0x10000



		/* Get the initial DTB size */

		ldr	r5, [r6, #4]

#ifndef __ARMEB__

		/* convert to little endian */

		eor	r1, r5, r5, ror #16

		bic	r1, r1, #0x00ff0000

		mov	r5, r5, ror #8

		eor	r5, r5, r1, lsr #8

#endif

		/* 50% DTB growth should be good enough */

		add	r5, r5, r5, lsr #1

		/* preserve 64-bit alignment */

		add	r5, r5, #7

		bic	r5, r5, #7

		/* clamp to 32KB min and 1MB max */

		cmp	r5, #(1 << 15)

		movlo	r5, #(1 << 15)

		cmp	r5, #(1 << 20)

		movhi	r5, #(1 << 20)

		/* temporarily relocate the stack past the DTB work space */

		add	sp, sp, r5



		stmfd	sp!, {r0-r3, ip, lr}

		mov	r0, r8

		mov	r1, r6

		sub	r2, sp, r6

		mov	r2, r5

		bl	atags_to_fdt



		/*
@@ -285,11 +306,11 @@ restart: adr r0, LC0 
		bic	r0, r0, #1

		add	r0, r0, #0x100

		mov	r1, r6

		sub	r2, sp, r6

		mov	r2, r5

		bleq	atags_to_fdt



		ldmfd	sp!, {r0-r3, ip, lr}

		sub	sp, sp, #0x10000

		sub	sp, sp, r5

#endif



		mov	r8, r6			@ use the appended device tree
@@ -306,7 +327,7 @@ restart: adr r0, LC0 
		subs	r1, r5, r1

		addhi	r9, r9, r1



		/* Get the dtb's size */

		/* Get the current DTB size */

		ldr	r5, [r6, #4]

#ifndef __ARMEB__

		/* convert r5 (dtb size) to little endian */

arch/arm/kernel/entry-v7m.S

+2 −0
Original line number Diff line number Diff line
@@ -22,10 +22,12 @@ 


__invalid_entry:

	v7m_exception_entry

#ifdef CONFIG_PRINTK

	adr	r0, strerr

	mrs	r1, ipsr

	mov	r2, lr

	bl	printk

#endif

	mov	r0, sp

	bl	show_regs

1:	b	1b

arch/arm/mm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -1012,6 +1012,7 @@ config ARCH_SUPPORTS_BIG_ENDIAN 


config ARM_KERNMEM_PERMS

	bool "Restrict kernel memory permissions"

	depends on MMU

	help

	  If this is set, kernel memory other than kernel text (and rodata)

	  will be made non-executable. The tradeoff is that each region is

arch/arm/mm/context.c

+11 −15
Original line number Diff line number Diff line
@@ -144,9 +144,6 @@ static void flush_context(unsigned int cpu) 
	/* Update the list of reserved ASIDs and the ASID bitmap. */

	bitmap_clear(asid_map, 0, NUM_USER_ASIDS);

	for_each_possible_cpu(i) {

		if (i == cpu) {

			asid = 0;

		} else {

		asid = atomic64_xchg(&per_cpu(active_asids, i), 0);

		/*

		 * If this CPU has already been through a
@@ -158,7 +155,6 @@ static void flush_context(unsigned int cpu) 
		if (asid == 0)

			asid = per_cpu(reserved_asids, i);

		__set_bit(asid & ~ASID_MASK, asid_map);

		}

		per_cpu(reserved_asids, i) = asid;

	}

arch/arm/mm/dma-mapping.c

+3 −0
Original line number Diff line number Diff line
@@ -2048,6 +2048,9 @@ static void arm_teardown_iommu_dma_ops(struct device *dev) 
{

	struct dma_iommu_mapping *mapping = dev->archdata.mapping;



	if (!mapping)

		return;



	__arm_iommu_detach_device(dev);

	arm_iommu_release_mapping(mapping);

}