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[67.174.241.145]) by smtp.gmail.com with ESMTPSA id nc15-20020a17090b37cf00b0028feef1f7adsm2251388pjb.50.2024.01.18.11.53.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jan 2024 11:53:24 -0800 (PST) From: Yang Shi To: jirislaby@kernel.org, surenb@google.com, riel@surriel.com, willy@infradead.org, cl@linux.com, akpm@linux-foundation.org Cc: yang@os.amperecomputing.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm: huge_memory: don't force huge page alignment on 32 bit Date: Thu, 18 Jan 2024 05:35:04 -0800 Message-Id: <20240118133504.2910955-1-shy828301@gmail.com> X-Mailer: git-send-email 2.39.0 MIME-Version: 1.0 X-Rspamd-Queue-Id: 45222C000B X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 49r9kgykqm6zijnuqi8frxz38dz1fi9h X-HE-Tag: 1705607606-707118 X-HE-Meta: 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 khRVIih9 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 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: List-Subscribe: List-Unsubscribe: From: Yang Shi The commit efa7df3e3bb5 ("mm: align larger anonymous mappings on THP boundaries") caused two issues [1] [2] reported on 32 bit system or compat userspace. It doesn't make too much sense to force huge page alignment on 32 bit system due to the constrained virtual address space. [1] https://lore.kernel.org/linux-mm/CAHbLzkqa1SCBA10yjWTtA2mKCsoK5+M1BthSDL8ROvUq2XxZMw@mail.gmail.com/T/#mf211643a0427f8d6495b5b53f8132f453d60ab95 [2] https://lore.kernel.org/linux-mm/CAHbLzkqa1SCBA10yjWTtA2mKCsoK5+M1BthSDL8ROvUq2XxZMw@mail.gmail.com/T/#me93dff2ccbd9902c3e395e1c022fb454e48ecb1d Fixes: efa7df3e3bb5 ("mm: align larger anonymous mappings on THP boundaries") Reported-by: Jiri Slaby Reported-by: Suren Baghdasaryan Tested-by: Jiri Slaby Tested-by: Suren Baghdasaryan Cc: Rik van Riel Cc: Matthew Wilcox Cc: Christopher Lameter Signed-off-by: Yang Shi Reviewed-by: Rik van Riel Acked-by: Michal Hocko --- mm/huge_memory.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 94ef5c02b459..e9fbaccbe0c0 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include @@ -811,6 +812,14 @@ static unsigned long __thp_get_unmapped_area(struct file *filp, loff_t off_align = round_up(off, size); unsigned long len_pad, ret; + /* + * It doesn't make too much sense to froce huge page alignment on + * 32 bit system or compat userspace due to the contrained virtual + * address space and address entropy. + */ + if (IS_ENABLED(CONFIG_32BIT) || in_compat_syscall()) + return 0; + if (off_end <= off_align || (off_end - off_align) < size) return 0;