From: Frederic Weisbecker <fweisbec@gmail.com>

https://bugzilla.kernel.org/show_bug.cgi?id=16315#c26
http://bugs.winehq.org/show_bug.cgi?id=23323

diff --git a/arch/x86/include/asm/hw_breakpoint.h b/arch/x86/include/asm/hw_breakpoint.h
index 528a11e..824ca07 100644
--- a/arch/x86/include/asm/hw_breakpoint.h
+++ b/arch/x86/include/asm/hw_breakpoint.h
@@ -20,7 +20,7 @@ struct arch_hw_breakpoint {
 #include <linux/list.h>
 
 /* Available HW breakpoint length encodings */
-#define X86_BREAKPOINT_LEN_X		0x00
+#define X86_BREAKPOINT_LEN_X		0x40
 #define X86_BREAKPOINT_LEN_1		0x40
 #define X86_BREAKPOINT_LEN_2		0x44
 #define X86_BREAKPOINT_LEN_4		0x4c
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index a474ec3..71123b1 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -208,9 +208,6 @@ int arch_bp_generic_fields(int x86_len, int x86_type,
 {
 	/* Len */
 	switch (x86_len) {
-	case X86_BREAKPOINT_LEN_X:
-		*gen_len = sizeof(long);
-		break;
 	case X86_BREAKPOINT_LEN_1:
 		*gen_len = HW_BREAKPOINT_LEN_1;
 		break;
@@ -233,6 +230,7 @@ int arch_bp_generic_fields(int x86_len, int x86_type,
 	switch (x86_type) {
 	case X86_BREAKPOINT_EXECUTE:
 		*gen_type = HW_BREAKPOINT_X;
+		*gen_len = sizeof(long);
 		break;
 	case X86_BREAKPOINT_WRITE:
 		*gen_type = HW_BREAKPOINT_W;
@@ -316,9 +314,6 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
 	ret = -EINVAL;
 
 	switch (info->len) {
-	case X86_BREAKPOINT_LEN_X:
-		align = sizeof(long) -1;
-		break;
 	case X86_BREAKPOINT_LEN_1:
 		align = 0;
 		break;