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Sun, 19 Nov 2023 08:58:06 -0800 (PST) From: Alexandru Elisei To: catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, david@redhat.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH RFC v2 06/27] mm: page_alloc: Allow an arch to hook early into free_pages_prepare() Date: Sun, 19 Nov 2023 16:57:00 +0000 Message-Id: <20231119165721.9849-7-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231119165721.9849-1-alexandru.elisei@arm.com> References: <20231119165721.9849-1-alexandru.elisei@arm.com> MIME-Version: 1.0 X-Rspam-User: X-Stat-Signature: 3o3xpmiptpzf535sc183jptfjj6kbt3u X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: F2E594000A X-HE-Tag: 1700413091-258000 X-HE-Meta: U2FsdGVkX19n9CDe4o7taepMBZqzAKIOgTdBFf0ThSbpt2ElQ4Ce9jbt56hxk1WmL7FJHVum0Un9YNA4YgdfTMYiHNcidzKc57/oGPqpAVdMyMTMbkZdOnpgw3GGtdLZeKFwyKe/7G782Npt2R6yjJc9220Q40DEVVx4zNkUizzc9QyN1tDy/1I6EnpAJ7vtzJ/2Q9sGyJv8zbtKgI9AHJiDYRAYXwrSyFJk2UP07Nxl+xZdqeYpyyllZzqK9wydSVTaa2sPbN6dBN55NqLnrYoL+VAiNQhp6x+wLBrabc2ZKfVH2esTR7qyh10wq/gieBmTIrNgzAYq2aIkmjIVetRH52OMHA1JaQ1kLkAxQfVIfvH3Oeum0qcqEOY53KfFTQjmQiz6B+FaHWF45MJeA8V2dUvr4ywmHM5WDSuXNgpNAXr/unHDAQ7wJlAE72y/9jhMPRI9+B+9NqB3tLotROVxGJu/QicfPMJe5Y+SITryJC980vB/2ZVKw84aRqkT9/raoqXbz83wg2ChhyklijtTfeypkC5BL2XPy9PM6iRNf95xjXK/W4zOcX36sEXZ+uIJ/kJT0XVCf6blRksVEFc5m8CTu53MOcqnjR2avhU9X8jHOFYfOnVZBpACq6UBUEZqvA0HxZN2ouQMLfkfV4qwrvJFYlKD6thzfh3TM/AD0tEJfkvhcZt9BpY7JpwiBaWjK9Q9fsLV6DZAB2kTwC0UxecF9ILNrAA0Zns3o/StsGUd3pxM1iTxE1UAbZv+RtmQQvUpGilmv3OjBIG0L++se9D70ZiH5F1UNZlQG1MnoIz1ZuDTu6b04oOksnH712481ppTJqgyA+0Stv9n12J+S+0Bd95ceTDnyQ1woB/ebkpGAE+ow3rB54Oc7/n6hSsJkJCmW+63biH3Sm8WE8s2ot9/d87mPEvf03rzBSO4BT3kljtYhlMnANSQOuiUiwBK7H5t6OyBjgGAWIW 1AmDsJ0U GqLjIRdvXcfL/ttmyY9apWNPFVPc6SWoTOYvfMzk3cGPASFrVgOdI9+2MjcsvUXlgUDFAZYy8bPFNg3TH4nBPMn1XfK8ngal9dAUMppgtqfHS5VB3dayfFK+bxsiDApxj7+W9fiDcDlEx3fDl8n+EM9u5goYq9Z6jcqgYEKMwnKJh9GOKVuUxAzBCBqVQu1wwrVcC/x4Rf1OmzEA= 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: Add arch_free_pages_prepare() hook that is called before that page flags are cleared. This will be used by arm64 when explicit management of tag storage pages is enabled. Signed-off-by: Alexandru Elisei --- include/linux/pgtable.h | 4 ++++ mm/page_alloc.c | 4 +++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index b31f53e9ab1d..3f34f00ced62 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -880,6 +880,10 @@ static inline int arch_prep_new_page(struct page *page, int order, gfp_t gfp) } #endif +#ifndef __HAVE_ARCH_FREE_PAGES_PREPARE +static inline void arch_free_pages_prepare(struct page *page, int order) { } +#endif + #ifndef __HAVE_ARCH_UNMAP_ONE /* * Some architectures support metadata associated with a page. When a diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b2782b778e78..86e4b1dac538 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1086,6 +1086,8 @@ static __always_inline bool free_pages_prepare(struct page *page, trace_mm_page_free(page, order); kmsan_free_page(page, order); + arch_free_pages_prepare(page, order); + if (unlikely(PageHWPoison(page)) && !order) { /* * Do not let hwpoison pages hit pcplists/buddy @@ -3171,7 +3173,7 @@ static inline unsigned int gfp_to_alloc_flags_cma(gfp_t gfp_mask, return alloc_flags; } -#ifdef HAVE_ARCH_ALLOC_PAGE +#ifdef HAVE_ARCH_PREP_NEW_PAGE static void return_page_to_buddy(struct page *page, int order) { int migratetype = get_pfnblock_migratetype(page, pfn);