linux-kernel - Re: [PATCH V1 09/10] arch/kmap: Define kmap_atomic

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Message-ID: <20200501023734.GF23230@ZenIV.linux.org.uk>
Date:   Fri, 1 May 2020 03:37:34 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     ira.weiny@...el.com
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH V1 09/10] arch/kmap: Define kmap_atomic_prot() for all
 arch's

On Thu, Apr 30, 2020 at 01:38:44PM -0700, ira.weiny@...el.com wrote:

> -static inline void *kmap_atomic(struct page *page)
> +static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
>  {
>  	preempt_disable();
>  	pagefault_disable();
>  	if (!PageHighMem(page))
>  		return page_address(page);
> -	return kmap_atomic_high(page);
> +	return kmap_atomic_high_prot(page, prot);
>  }
> +#define kmap_atomic(page)	kmap_atomic_prot(page, kmap_prot)

OK, so it *was* just a bisect hazard - you return to original semantics
wrt preempt_disable()...