linux-kernel - Re: [PATCH v6 4/4] hugetlb: allow to free gigantic pages regardless of the configuration

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Message-ID: <87va0m9nfi.fsf@concordia.ellerman.id.au>
Date:   Thu, 14 Mar 2019 13:53:21 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Alexandre Ghiti <alex@...ti.fr>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-mm@...ck.org, "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Cc:     Alexandre Ghiti <alex@...ti.fr>
Subject: Re: [PATCH v6 4/4] hugetlb: allow to free gigantic pages regardless of the configuration

[ Cc += Aneesh ]

Alexandre Ghiti <alex@...ti.fr> writes:
> diff --git a/arch/powerpc/include/asm/book3s/64/hugetlb.h b/arch/powerpc/include/asm/book3s/64/hugetlb.h
> index 5b0177733994..d04a0bcc2f1c 100644
> --- a/arch/powerpc/include/asm/book3s/64/hugetlb.h
> +++ b/arch/powerpc/include/asm/book3s/64/hugetlb.h
> @@ -32,13 +32,6 @@ static inline int hstate_get_psize(struct hstate *hstate)
>  	}
>  }
>  
> -#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
> -static inline bool gigantic_page_supported(void)
> -{
> -	return true;
> -}
> -#endif

This is going to clash with:

  https://patchwork.ozlabs.org/patch/1047003/

Which does:

@@ -35,6 +35,13 @@  static inline int hstate_get_psize(struct hstate *hstate)
 #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
 static inline bool gigantic_page_supported(void)
 {
+	/*
+	 * We used gigantic page reservation with hypervisor assist in some case.
+	 * We cannot use runtime allocation of gigantic pages in those platforms
+	 * This is hash translation mode LPARs.
+	 */
+	if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled())
+		return false;
 	return true;
 }
 #endif


Not sure how to resolve it.

cheers