linux-kernel - RE: arch/x86/lib/copy_mc.c:30:1: warning: no previous prototype for 'copy_mc_fragile_handle

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Date:   Wed, 9 Jun 2021 23:55:30 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Williams, Dan J" <dan.j.williams@...el.com>, lkp <lkp@...el.com>
CC:     "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...e.de>
Subject: RE: arch/x86/lib/copy_mc.c:30:1: warning: no previous prototype for
 'copy_mc_fragile_handle_tail'

> This routine is only ever called from ASM code, so the fact that there
> is no C declaration is expected.

Does the asm code really need to call back into C?

Could you just have the asm code do "jmp .L_read_trailing_bytes" (might need to only do that if %ecx is non-zero)?

-Tony