Re: [RFC PATCH 04/14] sparc64: load shared id into context register 1

On Sun, Dec 18, 2016 at 04:22:31PM -0800, Mike Kravetz wrote:

On 12/16/2016 11:45 PM, Sam Ravnborg wrote:

quoted

Hi Mike

quoted

diff --git a/arch/sparc/kernel/fpu_traps.S b/arch/sparc/kernel/fpu_traps.S
index 336d275..f85a034 100644
--- a/arch/sparc/kernel/fpu_traps.S
+++ b/arch/sparc/kernel/fpu_traps.S

@@ -73,6 +73,16 @@ do_fpdis:
 	ldxa		[%g3] ASI_MMU, %g5
 	.previous
 
+661:	nop
+	nop
+	.section	.sun4v_2insn_patch, "ax"
+	.word		661b
+	mov		SECONDARY_CONTEXT_R1, %g3
+	ldxa		[%g3] ASI_MMU, %g4
+	.previous
+	/* Unnecessary on sun4u and pre-Niagara 2 sun4v */
+	mov		SECONDARY_CONTEXT, %g3
+
 	sethi		%hi(sparc64_kern_sec_context), %g2

You missed the second instruction to patch with here.
This bug repeats itself further down.

Just noted while briefly reading the code - did not really follow the code.

Hi Sam,

This is my first sparc assembly code, so I could certainly have this
wrong.

Nope. I was to quick in my reading and in the reply.
when I looked at this with fresh eyes it looked perfectly OK.

That is to say - the patching part. I did not follow the code logic.

	Sam

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>