Zhipeng Xie 60490e7966 perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled ... This problem can be reproduced with CONFIG_PERF_USE_VMALLOC enabled on both x86_64 and aarch64 arch when using sysdig -B(using ebpf)[1]. sysdig -B works fine after rebuilding the kernel with CONFIG_PERF_USE_VMALLOC disabled. I tracked it down to the if condition event->rb->nr_pages != nr_pages in perf_mmap is true when CONFIG_PERF_USE_VMALLOC is enabled where event->rb->nr_pages = 1 and nr_pages = 2048 resulting perf_mmap to return -EINVAL. This is because when CONFIG_PERF_USE_VMALLOC is enabled, rb->nr_pages is always equal to 1. Arch with CONFIG_PERF_USE_VMALLOC enabled by default: arc/arm/csky/mips/sh/sparc/xtensa Arch with CONFIG_PERF_USE_VMALLOC disabled by default: x86_64/aarch64/... Fix this problem by using data_page_nr() [1] https://github.com/draios/sysdig Fixes: 906010b213 ("perf_event: Provide vmalloc() based mmap() backing") Signed-off-by: Zhipeng Xie <xiezhipeng1@huawei.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20220209145417.6495-1-xiezhipeng1@huawei.com		2022-04-19 21:15:42 +02:00
..
callchain.c	uaccess: remove CONFIG_SET_FS	2022-02-25 09:36:06 +01:00
core.c	perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled	2022-04-19 21:15:42 +02:00
hw_breakpoint.c	perf/hw_breakpoint: Replace deprecated CPU-hotplug functions	2021-08-26 09:14:36 +02:00
internal.h	perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled	2022-04-19 21:15:42 +02:00
Makefile	perf/core: allow ftrace for functions in kernel/event/core.c	2021-10-25 22:50:42 -04:00
ring_buffer.c	perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled	2022-04-19 21:15:42 +02:00
uprobes.c	mm: Add DEFINE_PAGE_VMA_WALK and DEFINE_FOLIO_VMA_WALK	2022-03-21 12:59:02 -04:00