linux-kernel - Re: [PATCH 08/12] parisc: use pgtable-nopXd instead of 4level-fixup

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Message-ID: <20191024085123.GB12281@rapoport-lnx>
Date:   Thu, 24 Oct 2019 11:51:24 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Rolf Eike Beer <eike-kernel@...tec.de>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greentime Hu <green.hu@...il.com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Helge Deller <deller@....de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Jeff Dike <jdike@...toit.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mark Salter <msalter@...hat.com>,
        Matt Turner <mattst88@...il.com>,
        Michal Simek <monstr@...str.eu>,
        Richard Weinberger <richard@....at>,
        Russell King <linux@...linux.org.uk>,
        Sam Creasey <sammy@...my.net>,
        Vincent Chen <deanbo422@...il.com>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-parisc@...r.kernel.org, linux-um@...ts.infradead.org,
        sparclinux@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>,
        linux-parisc-owner@...r.kernel.org
Subject: Re: [PATCH 08/12] parisc: use pgtable-nopXd instead of 4level-fixup

On Wed, Oct 23, 2019 at 12:20:29PM +0200, Rolf Eike Beer wrote:
> >diff --git a/arch/parisc/include/asm/page.h
> >b/arch/parisc/include/asm/page.h
> >index 93caf17..1d339ee 100644
> >--- a/arch/parisc/include/asm/page.h
> >+++ b/arch/parisc/include/asm/page.h
> >@@ -42,48 +42,54 @@ typedef struct { unsigned long pte; } pte_t; /*
> >either 32 or 64bit */
> >
> > /* NOTE: even on 64 bits, these entries are __u32 because we allocate
> >  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
> >-typedef struct { __u32 pmd; } pmd_t;
> > typedef struct { __u32 pgd; } pgd_t;
> > typedef struct { unsigned long pgprot; } pgprot_t;
> >
> >-#define pte_val(x)	((x).pte)
> >-/* These do not work lvalues, so make sure we don't use them as such. */
> >+#if CONFIG_PGTABLE_LEVELS == 3
> >+typedef struct { __u32 pmd; } pmd_t;
> >+#define __pmd(x)	((pmd_t) { (x) } )
> >+/* pXd_val() do not work lvalues, so make sure we don't use them as such.
> >*/
> 
> For me it sounds like there is something missing, maybe an "as" before
> lvalues?

Right, "as lvalues" makes sense.

> And it was "These", so plural, and now it is singular, so do -> does?

There's also pgd_val() a few lines below, it's just not visible in the
patch.
 
> Eike

-- 
Sincerely yours,
Mike.