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authorSong Liu <songliubraving@fb.com>2018-05-07 10:50:48 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2018-05-14 23:29:45 +0200
commitbae77c5eb5b2107e300fb02da2311f2aa0d8ee3c (patch)
tree54161e53098e6b684e7eb03bab0082626f0307fe /init
parenta84880ef4352c61896028448d809e32f8646628d (diff)
downloadlinux-bae77c5eb5b2107e300fb02da2311f2aa0d8ee3c.tar.gz
bpf: enable stackmap with build_id in nmi context
Currently, we cannot parse build_id in nmi context because of up_read(&current->mm->mmap_sem), this makes stackmap with build_id less useful. This patch enables parsing build_id in nmi by putting the up_read() call in irq_work. To avoid memory allocation in nmi context, we use per cpu variable for the irq_work. As a result, only one irq_work per cpu is allowed. If the irq_work is in-use, we fallback to only report ips. Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index f013afc74b11..480a4f2713d9 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1391,6 +1391,7 @@ config BPF_SYSCALL
bool "Enable bpf() system call"
select ANON_INODES
select BPF
+ select IRQ_WORK
default n
help
Enable the bpf() system call that allows to manipulate eBPF