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Thu, 22 Apr 2021 05:44:06 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 33E137805C; Thu, 22 Apr 2021 05:44:03 +0000 (GMT) Received: from skywalker.ibmuc.com (unknown [9.199.37.130]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 22 Apr 2021 05:44:02 +0000 (GMT) From: "Aneesh Kumar K.V" To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, kaleshsingh@google.com, npiggin@gmail.com, joel@joelfernandes.org, Christophe Leroy , "Aneesh Kumar K.V" Subject: [PATCH v5 8/9] mm/mremap: Allow arch runtime override Date: Thu, 22 Apr 2021 11:13:22 +0530 Message-Id: <20210422054323.150993-9-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210422054323.150993-1-aneesh.kumar@linux.ibm.com> References: <20210422054323.150993-1-aneesh.kumar@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: CFjIwE1qK5JB4_9LEGkMZcZ_yk0sFqaP X-Proofpoint-GUID: 71S9Xgb36zbyB6GAXroVTQLXVDj23-0D X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-22_01:2021-04-21,2021-04-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 phishscore=0 suspectscore=0 priorityscore=1501 impostorscore=0 mlxscore=0 adultscore=0 clxscore=1015 bulkscore=0 mlxlogscore=999 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104220047 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 973A52000250 X-Stat-Signature: g87teop5pz6iguf6t7ouep4rx4babdoc Received-SPF: none (linux.ibm.com>: No applicable sender policy available) receiver=imf18; identity=mailfrom; envelope-from=""; helo=mx0a-001b2d01.pphosted.com; client-ip=148.163.158.5 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619070258-130353 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Architectures like ppc64 support faster mremap only with radix translation. Hence allow a runtime check w.r.t support for fast mremap. Signed-off-by: Aneesh Kumar K.V --- arch/powerpc/include/asm/tlb.h | 6 ++++++ mm/mremap.c | 15 ++++++++++++++- 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h index 160422a439aa..09a9ae5f3656 100644 --- a/arch/powerpc/include/asm/tlb.h +++ b/arch/powerpc/include/asm/tlb.h @@ -83,5 +83,11 @@ static inline int mm_is_thread_local(struct mm_struct *mm) } #endif +#define arch_supports_page_table_move arch_supports_page_table_move +static inline bool arch_supports_page_table_move(void) +{ + return radix_enabled(); +} + #endif /* __KERNEL__ */ #endif /* __ASM_POWERPC_TLB_H */ diff --git a/mm/mremap.c b/mm/mremap.c index 9effca76bf17..27306168440f 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -25,7 +25,7 @@ #include #include -#include +#include #include #include "internal.h" @@ -220,6 +220,15 @@ static inline void flush_pte_tlb_pwc_range(struct vm_area_struct *vma, } #endif +#ifndef arch_supports_page_table_move +#define arch_supports_page_table_move arch_supports_page_table_move +static inline bool arch_supports_page_table_move(void) +{ + return IS_ENABLED(CONFIG_HAVE_MOVE_PMD) || + IS_ENABLED(CONFIG_HAVE_MOVE_PUD); +} +#endif + #ifdef CONFIG_HAVE_MOVE_PMD static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd) @@ -228,6 +237,8 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, struct mm_struct *mm = vma->vm_mm; pmd_t pmd; + if (!arch_supports_page_table_move()) + return false; /* * The destination pmd shouldn't be established, free_pgtables() * should have released it. @@ -294,6 +305,8 @@ static bool move_normal_pud(struct vm_area_struct *vma, unsigned long old_addr, struct mm_struct *mm = vma->vm_mm; pud_t pud; + if (!arch_supports_page_table_move()) + return false; /* * The destination pud shouldn't be established, free_pgtables() * should have released it.