From: Will Deacon Date: Thu, 16 May 2013 18:38:51 +0000 (+0100) Subject: ARM: 7729/1: vfp: ensure VFP_arch is non-zero when VFP is not supported X-Git-Tag: v3.10-rc3~11^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f27d6e172367a424ecf9d373062a820338671277;p=platform%2Fkernel%2Flinux-3.10.git ARM: 7729/1: vfp: ensure VFP_arch is non-zero when VFP is not supported Commit d3f79584a8b5 ("ARM: cleanup undefined instruction entry code") improved the register scheduling when handling undefined instructions. A side effect of this is that r5 is now used as a temporary, whilst the VFP probing code relies on r5 containing a non-zero value when VFP is not supported. This patch fixes the VFP detection code so that we don't rely on the contents of r5. Without this patch, Linux dies loudly on CPUs without VFP support. Signed-off-by: Will Deacon Signed-off-by: Russell King --- diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S index 323ce1a6..46e1749 100644 --- a/arch/arm/vfp/entry.S +++ b/arch/arm/vfp/entry.S @@ -60,7 +60,7 @@ ENTRY(vfp_testing_entry) str r11, [r10, #TI_PREEMPT] #endif ldr r0, VFP_arch_address - str r5, [r0] @ known non-zero value + str r0, [r0] @ set to non-zero value mov pc, r9 @ we have handled the fault ENDPROC(vfp_testing_entry)