KUEP broken on FSP2?

Michael Ellerman mpe at ellerman.id.au
Tue Oct 10 00:14:07 AEDT 2023

Eddie James <eajames at linux.ibm.com> writes:
> Hi,
> I'm attempting to run linux 6.1 on my FSP2, but my kernel crashes 
> attempting to get into userspace. The init script works, but the first 
> binary (mount) I run results in oops. Can anyone help me to debug this 
> further or suggest anything?

Hi Eddie,

It looks like breakage in syscall_exit_finish.

Can you test this? Patch is against v6.1.


diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 3fc7c9886bb7..decd2594fb9c 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -135,7 +135,8 @@ ret_from_syscall:
 	lis	r4,icache_44x_need_flush at ha
 	lwz	r5,icache_44x_need_flush at l(r4)
 	cmplwi	cr0,r5,0
-	bne-	2f
+	bne-	.L44x_icache_flush
 #endif /* CONFIG_PPC_47x */
 	lwz	r4,_LINK(r1)
@@ -170,10 +171,11 @@ syscall_exit_finish:
 	b	1b
 #ifdef CONFIG_44x
-2:	li	r7,0
+	li	r7,0
 	iccci	r0,r0
 	stw	r7,icache_44x_need_flush at l(r4)
-	b	1b
+	b	.L44x_icache_flush_return
 #endif  /* CONFIG_44x */
 	.globl	ret_from_fork

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