linux-kernel - Re: [PATCH] Use gcc alias instead of assembler aliases for syscalls

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Message-Id: <20130807165421.0b60ee9acbd1571426188448@linux-foundation.org>
Date:	Wed, 7 Aug 2013 16:54:21 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] Use gcc alias instead of assembler aliases for syscalls

On Mon,  5 Aug 2013 15:09:35 -0700 Andi Kleen <andi@...stfloor.org> wrote:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> Use standard gcc __attribute__((alias(foo))) to define
> the syscall aliases instead of custom assembler macros.
> 
> This is far cleaner, and also fixes my LTO kernel build.
> 

This makes my x86_64 allmodconfig build emit screenfuls of

...
WARNING: "alloc_pages_current" [drivers/block/brd.ko] has no CRC!
WARNING: "alloc_pages_current" [drivers/base/firmware_class.ko] has no CRC!
WARNING: "schedule_timeout" [drivers/atm/solos-pci.ko] has no CRC!
WARNING: "schedule_timeout" [drivers/atm/iphase.ko] has no CRC!
WARNING: "schedule_timeout" [drivers/atm/he.ko] has no CRC!
WARNING: "schedule_timeout" [drivers/acpi/sbshc.ko] has no CRC!
WARNING: "schedule_timeout" [drivers/acpi/acpi_ipmi.ko] has no CRC!
WARNING: "alloc_pages_current" [crypto/async_tx/raid6test.ko] has no CRC!
WARNING: "alloc_pages_current" [crypto/async_tx/async_pq.ko] has no CRC!
WARNING: "alloc_pages_current" [crypto/algif_skcipher.ko] has no CRC!
WARNING: "schedule_timeout" [crypto/algif_skcipher.ko] has no CRC!
WARNING: "sock_register" [crypto/af_alg.ko] has no CRC!
WARNING: "task_nice" [block/cfq-iosched.ko] has no CRC!
WARNING: "perf_event_create_kernel_counter" [arch/x86/oprofile/oprofile.ko] has no CRC!
WARNING: "alloc_pages_current" [arch/x86/kvm/kvm.ko] has no CRC!
WARNING: "perf_event_create_kernel_counter" [arch/x86/kvm/kvm.ko] has no CRC!
WARNING: "alloc_pages_current" [arch/x86/kvm/kvm-amd.ko] has no CRC!
WARNING: "schedule_timeout" [arch/x86/kernel/cpu/mcheck/mce-inject.ko] has no CRC!
WARNING: "schedule_timeout" [arch/x86/kernel/apm.ko] has no CRC!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2

Unexpected, but I checked it a couple of times.
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