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Commit 06e944b8 authored by Russell King's avatar Russell King
Browse files

Merge tag 'ronx-next' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into devel-stable 

generic fixmaps
ARM support for CONFIG_DEBUG_RODATA
parents f114040e 80d6b0c2

Documentation/arm/memory.txt

+1 −1
Original line number Diff line number Diff line
@@ -41,7 +41,7 @@ fffe8000 fffeffff DTCM mapping area for platforms with 
fffe0000	fffe7fff	ITCM mapping area for platforms with

				ITCM mounted inside the CPU.



ffc00000	ffdfffff	Fixmap mapping region.  Addresses provided

ffc00000	ffefffff	Fixmap mapping region.  Addresses provided

				by fix_to_virt() will be located here.



fee00000	feffffff	Mapping of PCI I/O space. This is a static

arch/arm/include/asm/cacheflush.h

+10 −0
Original line number Diff line number Diff line
@@ -487,6 +487,16 @@ int set_memory_rw(unsigned long addr, int numpages); 
int set_memory_x(unsigned long addr, int numpages);

int set_memory_nx(unsigned long addr, int numpages);



#ifdef CONFIG_DEBUG_RODATA

void mark_rodata_ro(void);

void set_kernel_text_rw(void);

void set_kernel_text_ro(void);

#else

static inline void set_kernel_text_rw(void) { }

static inline void set_kernel_text_ro(void) { }

#endif



void flush_uprobe_xol_access(struct page *page, unsigned long uaddr,

			     void *kaddr, unsigned long len);



#endif

arch/arm/include/asm/fixmap.h

+14 −17
Original line number Diff line number Diff line
@@ -2,27 +2,24 @@ 
#define _ASM_FIXMAP_H



#define FIXADDR_START		0xffc00000UL

#define FIXADDR_TOP		0xffe00000UL

#define FIXADDR_SIZE		(FIXADDR_TOP - FIXADDR_START)

#define FIXADDR_END		0xfff00000UL

#define FIXADDR_TOP		(FIXADDR_END - PAGE_SIZE)



#define FIX_KMAP_NR_PTES	(FIXADDR_SIZE >> PAGE_SHIFT)

#include <asm/kmap_types.h>



#define __fix_to_virt(x)	(FIXADDR_START + ((x) << PAGE_SHIFT))

#define __virt_to_fix(x)	(((x) - FIXADDR_START) >> PAGE_SHIFT)

enum fixed_addresses {

	FIX_KMAP_BEGIN,

	FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,



extern void __this_fixmap_does_not_exist(void);

	/* Support writing RO kernel text via kprobes, jump labels, etc. */

	FIX_TEXT_POKE0,

	FIX_TEXT_POKE1,



static inline unsigned long fix_to_virt(const unsigned int idx)

{

	if (idx >= FIX_KMAP_NR_PTES)

		__this_fixmap_does_not_exist();

	return __fix_to_virt(idx);

}

	__end_of_fixed_addresses

};



static inline unsigned int virt_to_fix(const unsigned long vaddr)

{

	BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);

	return __virt_to_fix(vaddr);

}

void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);



#include <asm-generic/fixmap.h>



#endif

arch/arm/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -67,7 +67,7 @@ test-kprobes-objs += kprobes-test-arm.o 
endif

obj-$(CONFIG_OABI_COMPAT)	+= sys_oabi-compat.o

obj-$(CONFIG_ARM_THUMBEE)	+= thumbee.o

obj-$(CONFIG_KGDB)		+= kgdb.o

obj-$(CONFIG_KGDB)		+= kgdb.o patch.o

obj-$(CONFIG_ARM_UNWIND)	+= unwind.o

obj-$(CONFIG_HAVE_TCM)		+= tcm.o

obj-$(CONFIG_OF)		+= devtree.o

arch/arm/kernel/ftrace.c

+19 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/ftrace.h>

#include <linux/uaccess.h>

#include <linux/module.h>

#include <linux/stop_machine.h>



#include <asm/cacheflush.h>

#include <asm/opcodes.h>
@@ -35,6 +36,22 @@ 


#define	OLD_NOP		0xe1a00000	/* mov r0, r0 */



static int __ftrace_modify_code(void *data)

{

	int *command = data;



	set_kernel_text_rw();

	ftrace_modify_all_code(*command);

	set_kernel_text_ro();



	return 0;

}



void arch_ftrace_update_code(int command)

{

	stop_machine(__ftrace_modify_code, &command, NULL);

}



static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec)

{

	return rec->arch.old_mcount ? OLD_NOP : NOP;
@@ -73,6 +90,8 @@ int ftrace_arch_code_modify_prepare(void) 
int ftrace_arch_code_modify_post_process(void)

{

	set_all_modules_text_ro();

	/* Make sure any TLB misses during machine stop are cleared. */

	flush_tlb_all();

	return 0;

}