linux-kernel - Re: [PATCH v2] powerpc/mm: mark more tlb functions as __always

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Message-Id: <45hnfs4k9gz9sNs@ozlabs.org>
Date:   Mon,  8 Jul 2019 11:19:33 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, Nicholas Piggin <npiggin@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Paul Mackerras <paulus@...ba.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Suraj Jitindar Singh <sjitindarsingh@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH v2] powerpc/mm: mark more tlb functions as __always_inline

On Tue, 2019-05-21 at 13:13:24 UTC, Masahiro Yamada wrote:
> With CONFIG_OPTIMIZE_INLINING enabled, Laura Abbott reported error
> with gcc 9.1.1:
> 
>   arch/powerpc/mm/book3s64/radix_tlb.c: In function '_tlbiel_pid':
>   arch/powerpc/mm/book3s64/radix_tlb.c:104:2: warning: asm operand 3 probably doesn't match constraints
>     104 |  asm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)
>         |  ^~~
>   arch/powerpc/mm/book3s64/radix_tlb.c:104:2: error: impossible constraint in 'asm'
> 
> Fixing _tlbiel_pid() is enough to address the warning above, but I
> inlined more functions to fix all potential issues.
> 
> To meet the "i" (immediate) constraint for the asm operands, functions
> propagating "ric" must be always inlined.
> 
> Fixes: 9012d011660e ("compiler: allow all arches to enable CONFIG_OPTIMIZE_INLINING")
> Reported-by: Laura Abbott <labbott@...hat.com>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Reviewed-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/6d3ca7e73642ce17398f4cd5df1780da4a1ccdaf

cheers