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Commit 4db3dddb authored by Neil Leeder's avatar Neil Leeder
Browse files

soc: qcom: cpaccess: use insn to write kernel word 



Use the aarch64 insn functionality to write a word
into kernel space which might otherwise be
write-protected.

Change-Id: I022ecfb3c00b81146baf165f2980104e6ec9d502
Signed-off-by: default avatarNeil Leeder <nleeder@codeaurora.org>
parent 0600f6c1

drivers/soc/qcom/cpaccess64.c

+2 −2
Original line number Diff line number Diff line
@@ -30,7 +30,7 @@ 
#include <linux/types.h>

#include <asm/cacheflush.h>

#include <asm/smp_plat.h>

#include <asm/mmu.h>

#include <asm/insn.h>

#include <soc/qcom/kryo-l2-accessors.h>



#define TYPE_MAX_CHARACTERS 20
@@ -176,7 +176,7 @@ static u64 do_cpregister_rw(int write) 
	 * instruction, ensuring cache coherency.

	 */

	p_opcode = (u32 *)&cpaccess_dummy_inst;

	mem_text_write_kernel_word(p_opcode, opcode);

	aarch64_insn_write(p_opcode, opcode);



	/*

	 * Use smp_call_function_single to do CPU core specific