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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260831-remove-pg_private-v2-2-3668159cd9e8@nvidia.com> References: <20260831-remove-pg_private-v2-0-3668159cd9e8@nvidia.com> In-Reply-To: <20260831-remove-pg_private-v2-0-3668159cd9e8@nvidia.com> To: David Hildenbrand , "Matthew Wilcox (Oracle)" , Andrew Morton , Muchun Song , Lorenzo Stoakes , "Liam R. 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: A high-order AUX page sets PG_private on its first page and stores the order in first_page->private. Stop using PG_private and check first_page->private for AUX page order only in the ring buffer and its users. This is fine because page->private is 0 for order-0 AUX pages, matching the page order. It prepares for a future commit that remove PG_private. No functional change intended. Assisted-by: Claude:claude-opus-4-8 Assisted-by: Codex:gpt-5 To: Peter Zijlstra To: Ingo Molnar To: Arnaldo Carvalho de Melo To: Namhyung Kim To: Thomas Gleixner To: Borislav Petkov To: Dave Hansen To: x86@kernel.org Cc: Mark Rutland Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Ian Rogers Cc: Adrian Hunter Cc: James Clark Cc: "H. Peter Anvin" Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Acked-by: Usama Arif Signed-off-by: Zi Yan --- arch/x86/events/intel/bts.c | 3 --- arch/x86/events/intel/pt.c | 6 ++---- kernel/events/ring_buffer.c | 7 +++---- 3 files changed, 5 insertions(+), 11 deletions(-) diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c index cbac54cb3a9ec..5849392cf26d5 100644 --- a/arch/x86/events/intel/bts.c +++ b/arch/x86/events/intel/bts.c @@ -66,9 +66,6 @@ static struct pmu bts_pmu; static int buf_nr_pages(struct page *page) { - if (!PagePrivate(page)) - return 1; - return 1 << page_private(page); } diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index 5754cd4055628..49349afee6119 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -781,8 +781,7 @@ static int topa_insert_pages(struct pt_buffer *buf, int cpu, gfp_t gfp) struct page *p; p = virt_to_page(buf->data_pages[buf->nr_pages]); - if (PagePrivate(p)) - order = page_private(p); + order = page_private(p); if (topa_table_full(topa)) { topa = topa_alloc(cpu, gfp); @@ -1296,8 +1295,7 @@ static int pt_buffer_try_single(struct pt_buffer *buf, int nr_pages) if (!intel_pt_validate_hw_cap(PT_CAP_single_range_output)) goto out; - if (PagePrivate(p)) - order = page_private(p); + order = page_private(p); if (1 << order != nr_pages) goto out; diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 9fe92161715e0..061b5cb222266 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -630,11 +630,10 @@ static struct page *rb_alloc_aux_page(int node, int order) /* * Communicate the allocation size to the driver: * if we managed to secure a high-order allocation, - * set its first page's private to this order; - * !PagePrivate(page) means it's just a normal page. + * set its first page's private to this order, otherwise page's + * private remains zero. */ split_page(page, order); - SetPagePrivate(page); set_page_private(page, order); } @@ -645,7 +644,7 @@ static void rb_free_aux_page(struct perf_buffer *rb, int idx) { struct page *page = virt_to_page(rb->aux_pages[idx]); - ClearPagePrivate(page); + set_page_private(page, 0); __free_page(page); } -- 2.53.0