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Message-ID: <4d9633cd-15c4-4cc1-ac67-2592e9fc7880@sifive.com>
Date: Wed, 27 Mar 2024 17:08:23 -0500
From: Samuel Holland <samuel.holland@...ive.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
Christoph Hellwig <hch@....de>, loongarch@...ts.linux.dev,
amd-gfx@...ts.freedesktop.org, Alex Deucher <alexander.deucher@....com>
Subject: Re: [PATCH v3 12/14] drm/amd/display: Use ARCH_HAS_KERNEL_FPU_SUPPORT
On 2024-03-27 4:25 PM, Andrew Morton wrote:
> On Wed, 27 Mar 2024 13:00:43 -0700 Samuel Holland <samuel.holland@...ive.com> wrote:
>
>> Now that all previously-supported architectures select
>> ARCH_HAS_KERNEL_FPU_SUPPORT, this code can depend on that symbol instead
>> of the existing list of architectures. It can also take advantage of the
>> common kernel-mode FPU API and method of adjusting CFLAGS.
>>
>> ...
>>
>> @@ -87,16 +78,9 @@ void dc_fpu_begin(const char *function_name, const int line)
>> WARN_ON_ONCE(!in_task());
>> preempt_disable();
>> depth = __this_cpu_inc_return(fpu_recursion_depth);
>> -
>> if (depth == 1) {
>> -#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
>> + BUG_ON(!kernel_fpu_available());
>> kernel_fpu_begin();
>
> For some reason kernel_fpu_available() was undefined in my x86_64
> allmodconfig build. I just removed the statement.
This is because the include guard in asm/fpu.h conflicts with the existing one
in asm/fpu/types.h (which doesn't match its filename), so the definition of
kernel_fpu_available() is not seen. I can fix up the include guard in
asm/fpu/types.h in the next version:
diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
index ace9aa3b78a3..75a3910d867a 100644
--- a/arch/x86/include/asm/fpu/types.h
+++ b/arch/x86/include/asm/fpu/types.h
@@ -2,8 +2,8 @@
/*
* FPU data structures:
*/
-#ifndef _ASM_X86_FPU_H
-#define _ASM_X86_FPU_H
+#ifndef _ASM_X86_FPU_TYPES_H
+#define _ASM_X86_FPU_TYPES_H
#include <asm/page_types.h>
@@ -596,4 +596,4 @@ struct fpu_state_config {
/* FPU state configuration information */
extern struct fpu_state_config fpu_kernel_cfg, fpu_user_cfg;
-#endif /* _ASM_X86_FPU_H */
+#endif /* _ASM_X86_FPU_TY{ES_H */
Regards,
Samuel
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