[PATCH] ARM: omap1: fix building with clang IAS

[PATCH] ARM: omap1: fix building with clang IAS

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

The clang integrated assembler fails to build one file with
a complex asm instruction:

arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: error: invalid instruction, any one of the following would fix this:
 mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
 ^
arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: note: instruction requires: armv6t2
 mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
 ^
arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: note: instruction requires: thumb2
 mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
 ^

The problem is that 'NR_IRQS_LEGACY' is not defined here. Apparently
gas does not care because we first add and then subtract this number,
leading to the immediate value to be the same regardless of the
specific definition of NR_IRQS_LEGACY.

Neither the way that 'gas' just silently builds this file, nor the
way that clang IAS makes nonsensical suggestions for how to fix it
is great. Fortunately there is an easy fix, which is to #include
the header that contains the definition.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/mach-omap1/ams-delta-fiq-handler.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-omap1/ams-delta-fiq-handler.S b/arch/arm/mach-omap1/ams-delta-fiq-handler.S
index a0fb7cca0fc3..e6a33024f6b4 100644
--- a/arch/arm/mach-omap1/ams-delta-fiq-handler.S
+++ b/arch/arm/mach-omap1/ams-delta-fiq-handler.S
@@ -16,6 +16,7 @@
 
 #include <asm/assembler.h>
 #include <linux/soc/ti/omap1-io.h>
+#include <asm/irq.h>
 
 #include "hardware.h"
 #include "ams-delta-fiq.h"
-- 
2.29.2


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Re: [PATCH] ARM: omap1: fix building with clang IAS

[Tony Lindgren]

* Arnd Bergmann <arnd@kernel.org> [210308 15:35]:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The clang integrated assembler fails to build one file with
> a complex asm instruction:
> 
> arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: error: invalid instruction, any one of the following would fix this:
>  mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
>  ^
> arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: note: instruction requires: armv6t2
>  mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
>  ^
> arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: note: instruction requires: thumb2
>  mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
>  ^
> 
> The problem is that 'NR_IRQS_LEGACY' is not defined here. Apparently
> gas does not care because we first add and then subtract this number,
> leading to the immediate value to be the same regardless of the
> specific definition of NR_IRQS_LEGACY.
> 
> Neither the way that 'gas' just silently builds this file, nor the
> way that clang IAS makes nonsensical suggestions for how to fix it
> is great. Fortunately there is an easy fix, which is to #include
> the header that contains the definition.

Acked-by: Tony Lindgren <tony@atomide.com>

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Re: [PATCH] ARM: omap1: fix building with clang IAS

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

On Mon, 8 Mar 2021 16:34:21 +0100, Arnd Bergmann wrote:
> The clang integrated assembler fails to build one file with
> a complex asm instruction:
> 
> arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: error: invalid instruction, any one of the following would fix this:
>  mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
>  ^
> arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: note: instruction requires: armv6t2
>  mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
>  ^
> arch/arm/mach-omap1/ams-delta-fiq-handler.S:249:2: note: instruction requires: thumb2
>  mov r10, #(1 << (((NR_IRQS_LEGACY + 12) - NR_IRQS_LEGACY) % 32)) @ set deferred_fiq bit
>  ^
> 
> [...]

Applied to arm/fixes.

[1/1] ARM: omap1: fix building with clang IAS
      commit: b897653a2fd4b7d0a77aa209d1e6b5cc08899bbf

       Arnd

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