drivers/perf: arm_spe: Don't error on high-order pages for aux buf
Since commit5768402fd9
("perf/ring_buffer: Use high order allocations for AUX buffers optimistically"), the perf core tends to back aux buffer allocations with high-order pages with the order encoded in the PagePrivate data. The Arm SPE driver explicitly rejects such pages, causing the perf tool to fail with: | failed to mmap with 12 (Cannot allocate memory) In actual fact, we can simply treat these pages just like any other since the perf core takes care to populate the page array appropriately. In theory we could try to map with PMDs where possible, but for now, let's just get things working again. Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Fixes:5768402fd9
("perf/ring_buffer: Use high order allocations for AUX buffers optimistically") Reported-by: Hanjun Guo <guohanjun@huawei.com> Tested-by: Hanjun Guo <guohanjun@huawei.com> Tested-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -855,16 +855,8 @@ static void *arm_spe_pmu_setup_aux(struct perf_event *event, void **pages,
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if (!pglist)
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goto out_free_buf;
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for (i = 0; i < nr_pages; ++i) {
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struct page *page = virt_to_page(pages[i]);
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if (PagePrivate(page)) {
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pr_warn("unexpected high-order page for auxbuf!");
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goto out_free_pglist;
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}
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for (i = 0; i < nr_pages; ++i)
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pglist[i] = virt_to_page(pages[i]);
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}
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buf->base = vmap(pglist, nr_pages, VM_MAP, PAGE_KERNEL);
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if (!buf->base)
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