[PATCH] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error

THREAD_ALIGN_SHIFT = THREAD_SHIFT + 1 = PAGE_SHIFT + 1
Maximum PAGE_SHIFT is 18 for 256k pages so
THREAD_ALIGN_SHIFT is 19 at the maximum.

No need to clobber cr1, it can be preserved when moving r1
into CR when we check stack overflow.

This reduces the number of instructions in Machine Check Exception
prolog and fixes a build failure reported by the kernel test robot
on v5.10 stable when building with RTAS + VMAP_STACK + KVM. That
build failure is due to too many instructions in the prolog hence
not fitting between 0x200 and 0x300. Allthough the problem doesn't
show up in mainline, it is still worth the change.

Reported-by: kernel test robot <redacted>
Fixes: 98bf2d3f4970 ("powerpc/32s: Fix RTAS machine check with VMAP stack")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <redacted>
---
 arch/powerpc/kernel/head_32.h        | 2 +-
 arch/powerpc/kernel/head_book3s_32.S | 6 ------
 2 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index a2f72c966baf..abc7b603ab65 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h

@@ -47,7 +47,7 @@
 	lwz	r1,TASK_STACK-THREAD(r1)
 	addi	r1, r1, THREAD_SIZE - INT_FRAME_SIZE
 1:
-	mtcrf	0x7f, r1
+	mtcrf	0x3f, r1
 	bt	32 - THREAD_ALIGN_SHIFT, stack_overflow
 #else
 	subi	r11, r1, INT_FRAME_SIZE		/* use r1 if kernel */

diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 54140f4927e5..10e6aa88b1ff 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S

@@ -278,12 +278,6 @@ MachineCheck:
 7:	EXCEPTION_PROLOG_2
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 #ifdef CONFIG_PPC_CHRP
-#ifdef CONFIG_VMAP_STACK
-	mfspr	r4, SPRN_SPRG_THREAD
-	tovirt(r4, r4)
-	lwz	r4, RTAS_SP(r4)
-	cmpwi	cr1, r4, 0
-#endif
 	beq	cr1, machine_check_tramp
 	twi	31, 0, 0
 #else

-- 
2.25.0

On Mon, 8 Feb 2021 07:17:40 +0000 (UTC), Christophe Leroy wrote:

THREAD_ALIGN_SHIFT = THREAD_SHIFT + 1 = PAGE_SHIFT + 1
Maximum PAGE_SHIFT is 18 for 256k pages so
THREAD_ALIGN_SHIFT is 19 at the maximum.

No need to clobber cr1, it can be preserved when moving r1
into CR when we check stack overflow.

[...]

Applied to powerpc/next.

[1/1] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error
      https://git.kernel.org/powerpc/c/3642eb21256a317ac14e9ed560242c6d20cf06d9

cheers